Measure performance of disk from AWR

We are using Oracle 10.2.0.4.0 on Linux platform.
This is a development database. After replacing the disk for database, my manager has asked me to find if the new disk is performing slow or fast. Can i gauge disk performance from AWR report by comparing the reports with old and new disks. I think I can use IO STATS section for comparison using average reads and writes per second. Is this a correct way?

Top 5 Timed Events (On new disk)
Event
Waits
Time(s)
Avg Wait(ms)
% Total Call Time
Wait Class
db file sequential read
639,846
5,530
9
76.9
User I/O
Can you please tell me as what is the average wait time. Is it the time taken by disk to serve one request. In Old disk, this time is 4 (ms). Does this suggest that the performance of old disk is better than this new one.

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HT203176 i have a slow macbook, i ran live disk utilities and said I need to repair disk from a cd. did that, I got volume repaired from the external disk. when I reboot from hdd, then run disk utility, I get the same error message i did b4 repair

i have a slow macbook, i ran live disk utilities (from hard drive), turned out I needed to repair disk from a installation disk. Did that, I got the volume (Hard drive) repaired from the installation disk disk. To this point, great!
When I reboot from hdd, then run disk utility, I get the same error message i did b4 repair. I went thru two rounds of this.....
Can anyone help? thanks

Sorry guys, I don't see how to reply to you so I use reply to "me" basically.
So the error I get is "volume header needs minor repair" and then you need to perform repair from the installation disk message.
I did repair not verify from the disk twice. Every time ending in the "the volume had ha been successfully repaired". Then I reboot from the internal disk. Run disk utilities from it, do verify and get the same error message I got before repair. I hope this can shed some light fr you guys. Sorry I didn't include details in the original
MEssage.

Install EBS on local disk from remote win 2003? Can't pass file space check

I have a portable 250G hard disk on my poor performance win xp,I want to install EBS 12 on my portable hard disk,but I xp system's performance is poor,so I connect to a fine performance win 2003 through mstsc and I can access my 250G hard disk from remote computer win 2003;
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Instead of using "\\tsclient\M\ebs\db\tech_st\10.2.0" as a directory path, map this network drive as any other free drive (i.e. F:\, G:\ .. etc). You should be able to proceed with the installation then.
If you need more details about mapping network drive, please refer to:
Windows XP: Mapping a network drive
http://www.microsoft.com/windowsxp/using/networking/maintain/mapdrive.mspx

I have a mac os x ver. 10.5.8 2x2.8 quad. my start up disk is almost full. can i change my start up disk from the original hard drive to an additional hard drive i added in Bay 4?

i have a mac os x ver. 10.5.8 2x2.8 quad. my start up disk is almost full. can i change my start up disk from the original hard drive to an additional hard drive i added in Bay 4?

Always want to keep the boot drive with more free space than may seem necessary for performance and to function at its best, 30-40% free or even 50% is not excessive.
Ideal is to separate your system from your data.
You should always have bootable backup / clone of your system
Don't use a green drive for system or data though.
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Then move the system drive to #1 - no matter what you want to reset the default boot volume to where the system is.
Using Cloning as a Backup Strategy
Carbon Copy Cloner 3.4.1
http://www.bombich.com/software/updates/ccc-3.5.html
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http://macperformanceguide.com/Mac-HowToClone.html
http://www.macupdate.com/app/mac/7032/carbon-copy-cloner
http://www.macperformanceguide.com/blog/2012/20120711_2-MacPro-internal-clone-ba ckup.html
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http://support.apple.com/kb/HT4337
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Use SE30 to measure performance in background

Hi,
I want to measure performance of an existing program by running it in background because it takes a really long time to run.
I m trying to use the "Schedule Measurements for user service" option from the menu. But when I click on the new icon after going to Schedule Measurements for user service menu, I get a short dump with message
MOVE_NOT_SUPPORTED.
on the following line of code of standard SAP program SAPMS38T
> convert time stamp l_ts time zone sy-zonlo.
My question is
1. Am I using the right option to measure the performance in bacground or is there any other way (except changing code to put log statements)
2. How can I fix the above problem.
Will give points to the right answer. Thanks for reading.

I generally use ST05 to measure performance.
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DBA Staff KPI(s) - Measuring Performance

DBA Staff KPI(s) - Measuring Performance



Hi,
I am an IT manager, managing two solutions: "SCM" & "WMS (Warehouse Management System)", and there is a team for each solution.
DBA staff are involved, almost, with everything (database administration, handling system/application performance & stability, Application support, creating & automating reports for all levels, monitoring interfaces issues, troubleshooting, handling investigations for operations/management/business/research/system issues ...etc.)
Its not easy to identify their KPI(s) and the additional responsibilities.

If you know some common KPI(s) that have been used before, I really appreciate if you can share them with me, so I can evaluate my team properly.




Thanks ......
Regards,
Ala' 


Just a comment that while your Subject says "DBA", the job responsibilities include many other things which are outside the definition of a DBA role, eg Application support, creating "reports" for "all" levels, troubleshooting "business" issues, etc
So what does "all" levels mean? Does that mean reports from the Application? or just the technical aspects of database administration like I/O, memory, latches etc. What does troubleshooting "business" issues mean? Does that mean identifying why the accounting books don't balance?
I understand that while the DBA role can be clearly defined in theory (Oracle Database Administrator's Guide - Task of a DBA), in practice many organizations, especially the smaller ones, are closer to what you have described. In such cases, the approach I'm familiar with has been to define as much as practicable the primary and secondary responsibilities of each position, and define the KPIs for the primary and make rather vague statements for the secondary role(s).
Thank you that was valuable,
So what does "all" levels mean?Answer: Application Reports go to all level of management, from department managers to senior mgmt and directors.
It includes,
- Productivity measurements.
- Identifying some of business requirements.
- Creating/Building estimates for any CR.
- Should be involved with warehouse expansions plans.
- Reporting critical operations & inventory activities.
- Building interactive reports.
- Cost allocation, ... etc.
Then the normal DBA comes which includes I/O, memory, DB performance, application & DB users ... etc.
You are right: I can take their primary responsibilities to define their KPIs and leave secondary responsibilities on vague statements for the secondary role(s), so, I can evaluate them according to the primary part and leave the secondary part for them to compete on it.
Thanks again

Measure for Windows, Disk 1 of 3 is damaged, how can I get a copy to install it?

El disco 1 de 3 del programa "Measure for Windows" esta dañado, estoy intentando instalarlo por primera vez y desafortunadamente cuando lo estaba instalando fallo la instalación y despues no ha reconocido el formato de este disco, ¿como podria obtener una copia de este disco?, ¿hay alguna manera de instalarlo en linea usando mi número de serie para instalarlo?.
Measure for Windows, Disk 1 of 3 is damaged, how can I get a copy to install it? or, can I install this SW online using my S/N?

Hello to all
another option is to download and install the portable firefox version from the next link, if you want to use it occasionally : http://sourceforge.net/projects/portableapps/files/Mozilla%20Firefox%2C%20Portable%20Ed./
portable version is more flexible, and you can delete it any time without worries
please read the [http://forums.mozillazine.org/viewtopic.php?f=23&t=2249039 ultimate guide from '''the-edmeister''']
thank you

Migrating ASM disk from singlepath to multipath

Hi,
I need to migrate the single path for the SAN disks to a multipath access mode.
Here is my environment :
Oracle DB : 11gR2 Enterprise version (2 Node RAC)
OS : Oracle Enterprise Linux 5
DB file system : ASM disks with ASMLib
disk used : SAN disk
Multipath software : EMC Powerpath
single path names are : /dev/sdb, /dev/sdc, .. etc.
Multipath Name would be : /dev/emcpowera, /dev/emcpowerb etc.
From different metalink document and google, I came up with the following steps for migrating the ASM disks from singlepath to multipath :
(** Perform the below steps on both the nodes)
1.     Open ASMLIB configuration file: /etc/sysconfig/oracleasm (Backup this file at this point)
3.     Edit the variable ORACLEASM_SCANORDER to provide the prefix path of the multipath disk.
For example:
The multipath disk name would be /dev/emcpowera, /dev/emcpowerb etc. (Since we are using emc powerpath), set the ORACLEASM_SCANORDER variable as follows:
ORACLEASM_SCANORDER="emcpower"
4.     Edit the variable ORACLEASM_SCANEXCLUDE to exclude the single disks (/dev/sd*) from scan process.
ORACLEASM_SCANEXCLUDE=”sd”
5.     Reboot both the nodes.
Are the above steps fine? Any addition/ modification needed ? Please advise.
Raised an SR for this, but did not get a direct answer.
Also. Do I need to set the ASM_DISKSTRING parameter to any specific value for my ASM instance? It is currently set to NULL.
Thanks.

Hi,
no actually that's all there is to it.
Since you use ASMLIB, the disks will be presented the same to ASM. So there is no need to change the DISCOVERY_STRING.
Only thing I personally would do (for testing purposes) is the following:
1.) Check before migrating that all disks are there (oracleasm listdisks), then
2.) Disable the automatic startup of the crs stack (crsctl disable crs), that you can test everything (including reboot) without having the clustarstack start automatically.
3.) If after the reboot the oracleasm listdisks sees all disks you are fine
4.) Enable crs again (crsctl enable crs) and start the clusterstack (crsctl start crs).
Regards
Sebastian

How do i run a Repair Disk from ARD

how do i run a Repair Disk from ARD

have you considered a netboot image and or a safeboot?
With a netboot image you could try repairing the drive remotely. (the down side is this requires a mac os x server to do)
A SafeBoot can be remotely triggered, and it include automatic disk check and repair. (the downside is depending on how the computer is connected to the network, it may not re-connect to the network when safeboot complete and boots into 'safe mode'. ) I find if the computer is connected to the network by a built-in ethernet adapter, I can usually still access the computer in safe mode
Before running a disk repair or permissions repair, it's a good idea to make sure the computer is backed up.
Also, in the case that a NetBoot, Disk Repair, or SafeBoot fails, you would probable want to be able to physically walk over to the computer.
Resolve startup issues and perform disk maintenance with Disk Utility and fsck explains that SafeBoot includes Automatic Verify and Repair of Disk.
Mac OS X: Starting up in Safe Mode explains how to use the terminal to configure a computer to SafeBoot into SafeMode. It also explains how to turn off SafeBoot after booting into SafeMode.
cheers!

Guideline Performance Initial Download from SAP for Utility into SAP CRM

Hello,
Please find below a link (valid for 10 weeks) to the document Guideline Performance Initial Download from SAP for Utilities into SAP CRM. The document is also published in the SAP Service Market Place at http://service.sap.com/utilities. Then choose Technical Information Center - Migration.
The purpose of the document is to give guidelines as well as to share experience for an efficient and high performance execution of an initial download from an SAP for Utilities system to an SAP CRM system, such as:
- Configuration of the initial download
- Ensure optimum performance for the initial download of the relevant business objects
- Avoid unnecessary business data being downloaded
- Monitoring of the initial download and taking corrective actions in case of problems
- Handle errors occurring during the initial download of business objects
- Minimize performance bottlenecks
The document explains the setup and configuration of the SAP for Utilities and SAP CRM systems only if necessary for the understanding of the solution of a described performance problem. This document does not cover the performance optimization of the delta down- and upload and the synchronization download.
The document has the following structure:
Chapter 1 describes the basics of an initial download
Chapter 2 describes how to plan and execute tests to achieve an acceptable performance
Chapter 3 describes the most important technical activities to prepare the involved systems
Chapter 4 describes the most important functional activities to prepare the involved system
Chapter 5 describes how to perform an initial download
Chapter 6 describes measures to improve the performance of an initial download
Chapter 7 provides a list of important repository tables
Chapter 8 contains a list of important SAP Notes related to initial download
I'd highly appreciate your valuable feedback on this document.
Kind regards,
Fritz
Edited by: William Eastman on Feb 17, 2011 2:34 PM

Hi Fritz,
sorry for the late late reply but I didn't notice your answer.
Here are my answers:
(1) I monitored the behaviour on the CRM system, CRM 7.0, SP5
(2) The change should be implemented in the CRM system
(3) Deactivate buffering for scenarios marketing, sale and service via SM30 and table T770MATTR.
By doing this the initial load of 3.2 million business agreements took around 2 hours, with activated scenario buffering I was at least ten times slower.
After the initial load you have to activate the buffering again.
Interesting to know would be why the scenario buffering only affects the initial load of business agreements and no other object. As far as I know the scenario buffering is relevant for the organizational management.
Regards
Alexander

Burning disks from MBA using Remote Disk

Several posts have been made related to being able to burn Optical disks from the MBA using the Remote Disc feature.
So far all I've been able to perform using Remote Disc is for reading software Installer discs such as the Apple's Mac OS X DVD Installer disc and $MS Office:mac 2004 Installer disc.
Any attempt to write/burn an optical disc using Remote Disc has been unsuccessful.
What does work (as you would expect to work) is the Toast 8 Titanium's ToastAnywhere feature. Having Toast 8 installed on both Macs it's possible to launch Toast 8 on the MBA and have access to the optical drive on another Mac with Toast 8 installed. I've successfully done this several times for burning optical discs. I used my MBA and my PowerMac G5's SuperDrive.
I assume the reverse will work where the PowerMac G5 could access the MBA's $99 SuperDrive for burning optical discs.

Remote Disk is generally used to share a CD or DVD drive to install things across the network so you don't have to buy a SuperDrive. To get to a shared Windows drive, you have to set up Sharing. Windows uses SMB (Simple Message Block). Search support for documents on sharing with a Windows PC. Many of the Mac 101 and Switching documents discuss this also. If the drive is shared in the Windows on the same subnet (you might have to designate a workgroup on the Mac, don't remember) it will appear in Finder on the Mac.

ZBook 17 g2 - poor DPC Latency performance when running from z Turbo Drive PCIe SSD

I'm setting up a new zBook 17 g2 and am getting very poor DPC latency performance (> 6000 us) when running from the PCIe SSD. I've re-installed the OS (Win 7 64 bit) on both the PCIe SSD and a SATA HDD and the DPC latency performance is fine when running from the HDD (50 - 100 us) but horrible when running from the PCIe SSD (> 6000 us). I've updated the BIOS and tried every combination of driver and component enabling/disabling I can think of. The DPC latency is extremely high from the initial Windows install with no drivers installed. Adding drivers seems to have no effect on the DPC latency. Before purchasing the laptop I found this review: http://www.notebookcheck.net/Review-HP-ZBook-17-E9X11AA-ABA-Workstation.106222.0.html where the DPC latency measurement (middle of the page) looks OK. Of course, this is the prior version of the laptop and I believe it does not have the PCIe SSD. Combining that with the fact that I get fine performance when running from the HDD I am led to believe that the PCIe SSD is the cause of the problem. Has anyone found a solution to this problem? As it stands right now my zBook is not usable for digital audio work when running from the PCIe SSD. But it cost me a lot of money so I'd sure like to use it...! Thanks, rgames

Hi mooktank, No solution yet but, as of about six weeks ago, HP at least acknowledged that it's a problem (finally). I reproduced it perfectly on another zBook 17 g2 and another PCIe SSD in the same laptop and HP was able to reproduce the problem as well. So the problem is clearly in the BIOS or with some driver related to the PCIe SSD. It could also be with the firmware in the drive, itself, but I can't find any other PCIe drives in the 60 mm form factor. So there's no way to see if a differnt type of drive would fix the problem. My suspicion is that it's related to the PCIe sleep states - those are known to cause exactly these types of problems because the drive takes quick "naps" to save power and there's a delay when it is told to wake back up. That delay causes a delay in the audio buffer that results in pops/crackles/stutters that would never be noticed doing other tasks like video editing or CAD work . So it's a problem specific to folks who need low-latency audio performance (very few apps require low latency audio - video editing, for example, uses huge buffers with relatively high latency). A lot of desktops offer a BIOS option to disable those sleep states but no such option exists in HP's BIOS for that laptop. In theory you can do it from within Windows but it doesn't have an effect on my system. That might be one of those options that Windows allows you to change but that actually has no effect. One workaround is to disable CPU throttling. That makes the CPU run at full speed all the time and, I believe, also disables the PCIe and other sleep states. When I disable CPU throttling, DPC latency goes back to normal. However, the CPU is then running full-speed all the time so your battery life basically goes to nothing and the laptop gets *very* hot. Clearly that is not necessary because the laptop runs fine from the SATA SSD. HP needs to fix the latency problem associated with the PCIe drive. The next logical step is to provide a BIOS update that provides a way to disable the PCIe sleep states without disabling CPU throttling, like on many desktop systems. The bad news is that HP tech support is not very technical, so it takes forever for them to figure out what I'm talking about. It took a couple months for them to start using the DPC Latency checker. Hopefully there will be a fix at some point... in the meantime, I hope that HP sends me a check for spending so much time educating their techs on how computers work. And for countless hours lost re-installing different OSes only to show that the performance is exactly the same as shown in the DPC Latency checker. rgames

How do I access a had disk from the WAN?

I note that I can adjust my settings to allow myself or others to connect to the hard drive attached to Airport Extreme. In the advance>file sharing menu of Airport Utility have checked the boxesto share disks over Ethernet WAN port, as well as to advertise globally using bonjour, with access controlled by accounts.
Now say I'm at schoool or work and I want access to a file on that drive. How do I connect to it?
Also, what of the settings for "Windows File Sharing"?
I've trying to find the answer in the manuals and articles, but no luck...
Anyone know?

Hi worriedwoman,
You'll only be able to verify the hard drive when you're booted off the drive. The repair functionality is only available when you're running off the installation disc. When you purchased your computer it came with two discs (an installation disc and an applications disc).
Insert that installation disc, restart the computer and hold "C" immediately after pressing the power button. Continue to hold the "C" key until the Apple logo appears with the spinning gear, you can then release the key. Once the welcome screen appears, choose your language and wait for the menu to appear at the top of the screen. Choose Utilities > Disk Utilities and you'll be presented with the familiar screen.
The reason you see the two HDs is because of how Mac OS X categorizes your HD. The first one is the drive itself, indented below that (Macintosh HD) is the startup volume or mount point. If you had multiple partitions you'd have multiple entries. You'll want to select the Macintosh HD when performing your disk verification/repair operations.
_*You do not want to delete anything*_
The CD drive works the same way, the top one (MATSHITA CD-RW) is the drive and the indented entry is the drive's contents. No need to verify/repair either of those.
This URL is helpful for identifying keyboard shortcut icons - http://www.danrodney.com/mac/

Created second partition in bootcamp Windows and converted whole disk from basic to dynamic

Hi everyone. I don't post here often however I hope the following helps someone else down the road.
I currently user ML and have bootcamp installed. I needed more space on my ML partition so decided to free up space from bootcamp. Going about this completely the wrong way I booted into my bootcamp partition, ran the computer management app and shrank my boot camp partition by 8 GB. This created free unused space which I decided to format over to NTFS with a view to booting back into ML, deleting and adding to my ML partition (how wrong was I).
Prior to completing the format of the newly created free space in bootcamp I was presented with the usual 'yes' / 'no' warning dialogue saying something along the lines of 'formatting this disk from basic to dynamic will prevent any installed operating systems from booting'. I made three monumental blunders at this stage: a) not reading the dialoge box b) completely disregarding the severity of the warning in the diaglogue box c) (you guessed it) pressing 'yes'.
The moment I pressed yes it was the start of a four hour feeling of grief as I thought of the last 6 years of my life wiped from below my nose with no time machine backup.
Upon rebooting bootcamp to get into ML the reality of the situation hit home as no OSX boot, no apple logo, no boot sound, my mac is trying to boot into windows without the option key being held in or warning to present me with a BSOD.
One thought in my mind: "oh Sh*t!!!"
3.5 hours passes and much reading online, learning of linux commands, downloading of linux distros, finding out how to install software and successfully setup a bootable linux usb and I'm typing this up on my mac while I time machine my data away to a freshly formatted external drive. Many lessons learned.
This is what I did amongst the vacating of my bowels and absorption of much nicotine.
There are two pointers to this guide. I was lucky enough to have another computer at hand to conduct the research and create a bootable usb. It a windows 7 toshiba z930. So you're going to need at a minimum: another computer (windows for the guide), a usb stick 2~4GB should be ok.
1) download a linux iso, I downloaded ubuntu, you can download what ever you like, but you're going to need linux (the rest of my mini guide will use ubuntu 13.10 during examples) http://www.ubuntu.com/start-download?distro=desktop&bits=64&release=latest
2) download Universal USB Stick Installer 1.9.5.1 (from now on as UUSI) http://www.pendrivelinux.com/downloads/Universal-USB-Installer/Universal-USB-Ins taller-1.9.5.1.exe
3) plug in your usb drive. make sure there is nothing on it that you need to keep as it will be formatted and lost. also plug your mac into a router connected to the internet. this will help prevent any issues with wireless drivers when booting into ubuntu later on.
4) once the downloads are complete, run UUSI, get past the prompts until you get to the 'setup your selections page'
5) (A) select 'ubuntu' from step 1. (B) browse to your freshly downloaded ubuntu iso in step 2. (C) tick show all drives. (D) select the drive letter of your usb in step 3. tick we will format *drive letter here*. (E) depending on the size of your usb set some persistent storage - I had an 8gb usb to hand so I set 1GB, less will probably do. (F) double check your settings and click create then let the program do it's thing, it can take some time depending on the speed of your usb drive, mine took 10 mins.
6) safely remove the usb and plug it into your mac, turn the mac on and hold the option key, once the usb drive is found hit enter and select ‘try ubuntu without installing’
7) wait for the ubuntu os to load and click the settings icon from the left tool bar
8) under settings click user accounts
9) click the + symbol in the bottom left hand corner
10) select administrator from the account type box and type a name for your account then click add
11) select the account and change the password, then confirm it and click change
12) go back to the desktop and select the power off symbol in the top right hand corner and select your name from the list, this will log you out of your current session and ask you to log in under your newly created login
13) once logged in click the settings icon again from the left hand menu and under settings go to software and updates
14) in software & updates under the ubuntu software tab tick ‘community maintained free and open source software (universe)’ and ‘software restricted by copyright or legal issues (maintained)’ then click close and close the settings window. Also check at the bottom of this window under ‘installable from cd-rom/dvd’ for two entries ‘cdrom with ubuntu 13.10 ‘saucy salamander’ - uncheck on of these entries if both are the same. Not sure if this was just me or a common problem. I found that trying to do the apt-get update would run into errors at the end if one of the entries wasn't deselected.
15) hold ctrl + alt + T to bring up the terminal
16) in the terminal window type sudo passwd root then enter a password for the account
17) in the same terminal window type sudo -i and enter the password given from step 16 if requested
18) in the same terminal window type apt-get update and wait for the update to finish without errors
19) in the same terminal windows type apt-get install testdisk and wait for the installation to finish without errors
20) in the same terminal window type testdisk
21) select create log and then the drive you want to work on e.g. your main apple OS hard disk then select proceed
22) select your file system type - for my ML installation I had to select ‘EFI GPT’ I don’t know if this will be the same throughout all macs / macbooks
23) select analyse, the step should take less than a few seconds and testdisk may report back errors with the partitions or it may proceed to the ‘current partition structure’ screen. If errors are displayed proceed past them until the next screen.
24) at the ‘current partition screen’ select quick search, you will have an opportunity to backup your drive here. I won’t go through this step (never learn) as I did not complete it myself
25) after the searching has completed all the partitions on the disk should be shown. Find your OSX partition using the size reference at the bottom by pressing the up and down keys. Once you have found the partition that relates to the OSX partition that is failing to start hit the right key to make it a primary partition a ‘P’ should show to the left of the partition data. I had to make sure my EFI System and Mac HFS (155GB) partitions were marked as primary.
26) hit the enter key to continue to the next screen and use the right arrow key to select ‘write’
27) the program will warn you it will write the partition table so hit ‘Y’ and a confirmation should be displayed that this has been successful.
28) reboot the computer and remove the USB stick (i removed it at the white loading screen after the reboot, not sure if it makes any difference)
29) allow the computer longer to boot, mine took about 35 seconds to show the apple symbol whereas it normally took between 3~7 seconds before I destroyed it.
30) get into OSX and backup everything to time machine or whatever you use then it probably a good idea to kill off your bootcamp install and refresh your mac from the fresh backup.
Hope this helps someone. I couldn’t find anything conclusive on the net when I ran into problems (all my own fault really for not reading the dialogues correctly) however I used bits from multiple forums and found out parts myself especially the linux parts as I don't know the os at all . Certainly won’t be making this mistake again anytime soon.
Well I’ve had an awful night and have work in two hours but at least the last 6 years of my (now backed up) life is intact and in my hands. I’d rather lose a night of sleep than lose all my data.
Sorry if some of the stuff above is wrong as I don't do this thing on osx / linux at all really. At least it might point you in the right direction.

Hi everyone. I don't post here often however I hope the following helps someone else down the road.
I currently user ML and have bootcamp installed. I needed more space on my ML partition so decided to free up space from bootcamp. Going about this completely the wrong way I booted into my bootcamp partition, ran the computer management app and shrank my boot camp partition by 8 GB. This created free unused space which I decided to format over to NTFS with a view to booting back into ML, deleting and adding to my ML partition (how wrong was I).
Prior to completing the format of the newly created free space in bootcamp I was presented with the usual 'yes' / 'no' warning dialogue saying something along the lines of 'formatting this disk from basic to dynamic will prevent any installed operating systems from booting'. I made three monumental blunders at this stage: a) not reading the dialoge box b) completely disregarding the severity of the warning in the diaglogue box c) (you guessed it) pressing 'yes'.
The moment I pressed yes it was the start of a four hour feeling of grief as I thought of the last 6 years of my life wiped from below my nose with no time machine backup.
Upon rebooting bootcamp to get into ML the reality of the situation hit home as no OSX boot, no apple logo, no boot sound, my mac is trying to boot into windows without the option key being held in or warning to present me with a BSOD.
One thought in my mind: "oh Sh*t!!!"
3.5 hours passes and much reading online, learning of linux commands, downloading of linux distros, finding out how to install software and successfully setup a bootable linux usb and I'm typing this up on my mac while I time machine my data away to a freshly formatted external drive. Many lessons learned.
This is what I did amongst the vacating of my bowels and absorption of much nicotine.
There are two pointers to this guide. I was lucky enough to have another computer at hand to conduct the research and create a bootable usb. It a windows 7 toshiba z930. So you're going to need at a minimum: another computer (windows for the guide), a usb stick 2~4GB should be ok.
1) download a linux iso, I downloaded ubuntu, you can download what ever you like, but you're going to need linux (the rest of my mini guide will use ubuntu 13.10 during examples) http://www.ubuntu.com/start-download?distro=desktop&bits=64&release=latest
2) download Universal USB Stick Installer 1.9.5.1 (from now on as UUSI) http://www.pendrivelinux.com/downloads/Universal-USB-Installer/Universal-USB-Ins taller-1.9.5.1.exe
3) plug in your usb drive. make sure there is nothing on it that you need to keep as it will be formatted and lost. also plug your mac into a router connected to the internet. this will help prevent any issues with wireless drivers when booting into ubuntu later on.
4) once the downloads are complete, run UUSI, get past the prompts until you get to the 'setup your selections page'
5) (A) select 'ubuntu' from step 1. (B) browse to your freshly downloaded ubuntu iso in step 2. (C) tick show all drives. (D) select the drive letter of your usb in step 3. tick we will format *drive letter here*. (E) depending on the size of your usb set some persistent storage - I had an 8gb usb to hand so I set 1GB, less will probably do. (F) double check your settings and click create then let the program do it's thing, it can take some time depending on the speed of your usb drive, mine took 10 mins.
6) safely remove the usb and plug it into your mac, turn the mac on and hold the option key, once the usb drive is found hit enter and select ‘try ubuntu without installing’
7) wait for the ubuntu os to load and click the settings icon from the left tool bar
8) under settings click user accounts
9) click the + symbol in the bottom left hand corner
10) select administrator from the account type box and type a name for your account then click add
11) select the account and change the password, then confirm it and click change
12) go back to the desktop and select the power off symbol in the top right hand corner and select your name from the list, this will log you out of your current session and ask you to log in under your newly created login
13) once logged in click the settings icon again from the left hand menu and under settings go to software and updates
14) in software & updates under the ubuntu software tab tick ‘community maintained free and open source software (universe)’ and ‘software restricted by copyright or legal issues (maintained)’ then click close and close the settings window. Also check at the bottom of this window under ‘installable from cd-rom/dvd’ for two entries ‘cdrom with ubuntu 13.10 ‘saucy salamander’ - uncheck on of these entries if both are the same. Not sure if this was just me or a common problem. I found that trying to do the apt-get update would run into errors at the end if one of the entries wasn't deselected.
15) hold ctrl + alt + T to bring up the terminal
16) in the terminal window type sudo passwd root then enter a password for the account
17) in the same terminal window type sudo -i and enter the password given from step 16 if requested
18) in the same terminal window type apt-get update and wait for the update to finish without errors
19) in the same terminal windows type apt-get install testdisk and wait for the installation to finish without errors
20) in the same terminal window type testdisk
21) select create log and then the drive you want to work on e.g. your main apple OS hard disk then select proceed
22) select your file system type - for my ML installation I had to select ‘EFI GPT’ I don’t know if this will be the same throughout all macs / macbooks
23) select analyse, the step should take less than a few seconds and testdisk may report back errors with the partitions or it may proceed to the ‘current partition structure’ screen. If errors are displayed proceed past them until the next screen.
24) at the ‘current partition screen’ select quick search, you will have an opportunity to backup your drive here. I won’t go through this step (never learn) as I did not complete it myself
25) after the searching has completed all the partitions on the disk should be shown. Find your OSX partition using the size reference at the bottom by pressing the up and down keys. Once you have found the partition that relates to the OSX partition that is failing to start hit the right key to make it a primary partition a ‘P’ should show to the left of the partition data. I had to make sure my EFI System and Mac HFS (155GB) partitions were marked as primary.
26) hit the enter key to continue to the next screen and use the right arrow key to select ‘write’
27) the program will warn you it will write the partition table so hit ‘Y’ and a confirmation should be displayed that this has been successful.
28) reboot the computer and remove the USB stick (i removed it at the white loading screen after the reboot, not sure if it makes any difference)
29) allow the computer longer to boot, mine took about 35 seconds to show the apple symbol whereas it normally took between 3~7 seconds before I destroyed it.
30) get into OSX and backup everything to time machine or whatever you use then it probably a good idea to kill off your bootcamp install and refresh your mac from the fresh backup.
Hope this helps someone. I couldn’t find anything conclusive on the net when I ran into problems (all my own fault really for not reading the dialogues correctly) however I used bits from multiple forums and found out parts myself especially the linux parts as I don't know the os at all . Certainly won’t be making this mistake again anytime soon.
Well I’ve had an awful night and have work in two hours but at least the last 6 years of my (now backed up) life is intact and in my hands. I’d rather lose a night of sleep than lose all my data.
Sorry if some of the stuff above is wrong as I don't do this thing on osx / linux at all really. At least it might point you in the right direction.

I had a mac mini on snow leopard but it broke.I now have a macbook pro on leopard how do I upgrade using the disks from my old mac mini

can I use the osx disks from my old mac mini to upgrade my macbook pro so i can then get a further free upgrade

You can not use a DVD that shipped with one Mac to load on to another. To upgrade to Snow Leopard you will need to purchase the Snow Leopard DVD.
http://store.apple.com/us/product/MC573/mac-os-x-106-snow-leopard

Measure performance of disk from AWR

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