How ASM Manages Disk Failures

Hi,
Was going through Oracle ASM document and came across this topic, need some clarification on this please.
"The disks are first taken offline and then automatically dropped. In this case, the disk group remains mounted and serviceable. In addition, because of mirroring, all of the disk group data remains accessible. After the disk drop operation, Oracle ASM performs a rebalance to restore full redundancy for the data on the failed disks". -- What does this mean?
Thanks

Simple example.
Single normal redundancy diskgroup DATA1 with 2 failgroups called MIRROR1 and MIRROR2. Each failgroup has 3 x disks (let's say 512GB).
Disk 2 in failgroup MIRROR1 fails. The MIRROR1 failgroup is not available as a result. DB operations continue unaware of the problem as MIRROR2 is online and working fine.
The dba cannot fix disk 2 within the meantime for repair period of ASM. ASM forces disk 2 out the MIRROR1 failgroup by force dropping it. MIRROR1 has now 2 disk remaining.
ASM starts a rebalance process to stripe the contents of the MIRROR1 failgroup across 2 disks - as oppose to 3 disks. If the space in use fits on 2 disks the rebalance operation will succeed. MIRROR1 will become online and available. But it will only be able to carry 1TB of data, as oppose to MIRROR2 with it 3 disks and 1.5TB capacity.
If the space used cannot be striped across the remaining disks in MIRROR1, the rebalance will fail due to insufficient capacity and the failgroup will remain offline.
In either scenario, the recommended action is to add a new 512GB disk to MIRROR1, reverting it back to a 3 disk failgroup, and then rebalance the failgroup.

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I have new Oracle unbreakable linux installed. I have Oracle 11g running. Now I'm wanting to install ASM. When going through dbca - there are no available disk groups. When I click on "Create New" - there are no member disks for me to use. Normally these are already created for me by unix admin, but this is home set-up. Appreciate any help.

Hi,
You need to apply below RPM's and configure the ASMLIB, follow below steps, after the setup install the ASM and then it will show the avaliable disks.
Required RPM for ASM Configuration
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Tip: Enter the DISK_NAME in UPPERCASE letters.
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Marking disk "/dev/sdd1" as an ASM disk: [ OK ]
[root@vmractest1 ASMlib]# /etc/init.d/oracleasm createdisk VOL2 /dev/sdd1
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[root@vmractest1 ASMlib]# /etc/init.d/oracleasm createdisk VOL3 /dev/sde1
Marking disk "/dev/sde1" as an ASM disk: [ OK ]
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[root@vmractest1 ASMlib]# /etc/init.d/oracleasm listdisks
VOL1
VOL2
VOL3
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/etc/init.d/oracleasm scandisks
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[root@vmractest2 ASMlib_install]# /etc/init.d/oracleasm scandisks
Scanning system for ASM disks: [ OK ]
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Scanning system for ASM disks: [ OK ]
And then check that everything is as in the first node:
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VOL2
VOL3
[root@vmractest3 ASMlib_install]# /etc/init.d/oracleasm listdisks
VOL1
VOL2
VOL3
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If you still have issues please do let us know.
Regards,
Satya.

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Hello Tony
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Bye

How to calculate the disk failure level for a 3-way mirror pool?

On another post in this forum, the following information regarding a 3-way mirroring storage pool is given:
Pool requires a quorum of 50% plus drives to be present to survive.
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Maintaining the above requirements and providing the guarantee -
mandates us to have minimum 5 disks in pool. As if we loose 2, we still
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Just to be sure, I would like Microsoft to confirm that the following calculation applies to any number of disks in a 3-way mirroring pool.
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Thanks for your answer.

Hi,
>>Am I right in this assumption?
Based on my understanding, it’s not this case.
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files and can tolerate one drive failure, while three-way mirror spaces can tolerate two drive failures.
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Product Name: HP Pavilion p6390d
OS: Windows 7 32 - bit
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Things I did before having this error:
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Additional Information:
After my first format i installed AVG on my desktop just to stop small viruses that might affect my computer. I scanned it. and then afterwards i tried their new added feature which was PC TUNE UP, REGISTRY CLEANER and i used their program since they were the ones who detected that there are errors in my registry and other stuff (I still didn't have the HARD DISK ERROR at this time) and so i successfully downloaded the software and use it. and so i uninstalled the program since it was only a trial and can only be used 1 time. After sometime i seem to receive the message. And so my story goes on.(part where i reformatted my computer again)
This question was solved.
View Solution.

Derek, welcome to the forum.
The hard drive has S.M.A.R.T. technology. This tests your hard drive for possible failure. In your case, it appears that your drive is ready to fail. I suggest buying a new drive.
Please click "Accept as Solution" if your problem is solved.
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Trying to salvage iCal data after hard disk failure!

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Well, the structure of an ics file is easy to get (drag an event to desktop and open it with a text editor) and is well-described on the web, but I don't know about the structure of your icalevents, other than what we can see in the plist editor. After trimming out the time zone info, I get this for an ics file:
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Create Data Guard Using ASM Managed RMAN backup

we have an oracle database 11.1.0.7 working on Windows server 2003 (64bit). The storage in ASM managed (same 11.1.0.7). Our total database size is 4TB.
I will have to create a physical standby database (Data Guard) of this instance. Now I am having issues on how to transport my RMAN backup pieces (which is also ASM managed).
I cannot do an over the network RMAN backup because it will take months to complete.
We have external 4 hard disks (2 TB each). But my RMAN backup pieces are ASM in format.
Any ideas on how to easily create a data guard in this set up.

TheAlchemist wrote:
can you provide us any clear steps....Hope you asked for Restoring from backups.
1) Prepare PFILE and put in nomount status.
2) Restore standby controlfile
RMAN> restore standby controlfile from '+DG/...'
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SQL> alter database mount standby database;
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If you are restoring into another diskgroups, then use as below.
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Toshiba Satellite L650-07U, Hard disk failure and replacement

Hi all,
I have Toshiba Satellite L650-07U Laptop, Model: PSK1EC-0700Q with 4GB RAM, 650GB HD, Windows 7 Home Premium installed. At the time of first use, i made Recovery DVDs which took 4 blank DVDs using Recovery media creator.
From 2 weeks it is giving problem, at start its slowdown with every application, then suddenly it started Hard disk failure error and ask to backup important files. From that instant i did all my backup save in another portable Hard drive.
I had hiren boot CD, and ran RAM test and found it OK, and then run Hard Disk test and found few bad sectors at few certain point, As 650GB Hard disk was taking alot time of time for checking bad sectors, so i stopped that application.
First I tried Recovery DVDs to restore Windows, but it failed as Laptop DVD-Writer was unable to boot from those created DVDs (DVDs are OK as had checked it on Desktop computer DVD-ROM), Laptop DVD-Writer is also working as I test few more bootable CDs and it booted perfectly, but it is not booting from Recovery DVDs.
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I checked all partitions of drive using Hiren Boot CD, and had found that there are four default partitions in Toshiba original laptop drive,
One hidden partition of 1.5 GB
One hidden partition of almost 21 GB
One hidden partition of almost 12 GB
One partition of 561 GB, which was the original partition where windows 7 was installed along with all of my Data.
Now I want to replace faulty drive with a new one and have a lot of question in my mind which I need to share with you guys.
At the time of first use I installed Windows 7 64 bit edition, and made Recovery DVDs, and at second time of restore to factory setting I had installed Windows 7 32 bit. I have confusion about recovery DVDs (which is not booting from default DVD-Writer of Laptop), either it has 64 Bit recovery data or 32 bit? Or have both 64 and 32 bit Data.
Toshiba restore to factory setting without using any recovery DVD/USB is the best possible way to restore Windows 7, How can I make same recover hidden partitions from original/faulty hard drives to new hard drive partitions? Is this possible and how?
On Default hard drive there was one partition of 561GB instead of two or more partitions. Is this possible to split partitions in new hard drives instead of one big partition?
As Recovery DVDs are not able to boot from laptop default DVD-Writer, is it possible to open those DVDs on another System and copy tem in USB drive and use it for booting? If it is possible than please show me the steps for making bootable USB from these Recovery DVDs.
Thanks,
masterleous
Solved!
Go to Solution.

Satellite L650-07U (PSK1EC-07U00Q)
This site is for US computers. I doubt you'll get your questions for that Canadian model answered here.
There appear to be two recovery partitions. Maybe one for 32- and one for 64-bit Windows. Or maybe one is for English and the other for French.
Your User's Manual isn't much help either. You probably need to ask Toshiba tech support in Canada.
About all I have to offer is this: Be wary of drives with advanced-format technology. See my message about that.
-Jerry

Music Files Deleted After Hard Disk Failure and First Sync After Hard Disk

Hi,
I recently had a hard disk failure and lost all of the data on my hard drive. I replaced the hard drive and reinstalled all of the software including iTunes. I am running Windows XP Home. The first time I plugged my iPod Nano into my computer after the hard drive replacement it synced to iTunes and since iTunes had no music files it deleted all of the music files on my Nano. How do I get them back and why on earth would iTunes do such a stupid thing??? My Nano contained many songs that I bought from iTunes and I want to get them back. I have found some third party software that will undelete the deleted files but it costs $69. I don't feel that I should have to pay to correct a defective feature in iTunes. Does Apple have an undelete utility? Can I redownload the songs that I purchased from iTunes?

*The first time I plugged my iPod Nano into my computer after the hard drive replacement it synced to iTunes*
When you connected did you get a message that your iPod was linked to another library, and then press Erase and Sync? When an iPod is set to update automatically and you connect to a computer with an empty iTunes and accept the message above it will erase the originals completely (as you have discovered). Also as you've seen, none of the recovery programs are particularly cheap so you have to decide if in your particular circumstances it's worth it to get your songs back. It may be if you have a lot of purchased tracks which you will have to pay to download again. If they came primarily from your CDs then it's most likely not as you can re-rip them.
*Can I redownload the songs that I purchased from iTunes?*
If you didn't make a back-up of your purchases to restore from then I'm sorry to say that the policy on lost purchases is that you have to pay to download them again:
"Once a Product is purchased and you receive the Product, it is your responsibility not to lose, destroy, or damage the Product, and Apple shall be without liability to you in the event of any loss, destruction, or damage." iTunes Store: Purchased content can be downloaded only once
You could try contacting the iTunes Music Store Customer Service and you might be able to persuade them to sanction a second free download. There have been occasional reports in the iTunes forum of this happening, however just be aware that they are not under any obligation to do so. If you click on any of the links on this page you'll find a space at the bottom to email your query: iTMS Customer Service

Hard disk failure imminent

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These are both partitions set up in single 500gb drive that were set up as part of the factory install.
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Failing Drive SATAO
Failing Attributer: #05
I am very disappointed that I continue to have hardware problems with factory installed HP components.

Since your computer is still under warranty, your best bet is to contact HP Customer Support and start the troubleshooting / repair process.
Please send KUDOs
Frank
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HP p7-1026 - Windows 7, 6GB RAM, AMD Radeon HD 6450
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Hard disk failure HP G7000 laptop

Hi,
I'm getting hard disk failure on a HP G7000 laptop. The machine boots fine from DVD drive using a Linux boot disk.
Vista installed on machine.
No recovery disk was created when machine was first bought and any disks provided with the machine when bought can't be found.
The Vista licence tag is on the base of the machine so I have a licence key for Vista.
1. What type of hard drive do I buy as replacement? SATA 2.5 inch?
2. Can I use any Microsoft Vista install disk and type in the licence key on the base of the machine?
Thanks
Clive

Hi,
The failure ID will either be a Smart or Disk Self Test failure - both would indicate that your Hard Drive is failing and will need to be replaced.
If your notebook is still under warranty, contact HP and arrange to have the drive replaced. Or incase your unit OOW you can purchase a New Hard drive.
Let us know how it goes!
"I work for HP."
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Regards
Manjunath

Hard Disk Failure, No Backup, OUCH!

I have suffered a fatal hard disk failure on one of my drives and I had to buy a new disk. Due to the nature of the striping RAID-0 array I use the other disk is rendered useless and I lost everything. Must reformat and reload software which is a lot of work but is at least possible. That operation is ongoing as we speak. It's the lost data that really hurts. Lesson learned. Conduct regular backups. "OK ComputerGods, I hear you now...I repent."
Here's my problem for this forum. I had roughly 2,500 songs on my iTunes which were ripped from my own CDs. The ripping operation took a lot of time and energy to do. Like I said I don't have a computer backup of those songs. I still have the CDs of course but I would like to avoid spending all that time and effort ripping again. I need to move my iTunes account to the new disk anyway and I'm not sure exactly how to procede and more importantly I have no idea how to retrieve the (ripped) songs from my iPod and get them back onto the new disk. I already know that I can simply reload the music I bought on iTunes. That's not the issue. It's the 2,500 or so songs I ripped that I don't want to lose.
So my questions are:
1) How to move iTunes account to (basically a new machine) without starting from scratch?
2) How to salvage the ripped music I already have on my iPod and get it back onto my computer?

*How to salvage the ripped music I already have on my iPod and get it back onto my computer?*
iTunes has an option to copy your iTunes Store purchases directly from an iPod to the computer, you'll find details in this article: Copying iTunes Store purchases from your iPod or iPhone to a computer
For everything else (music from CDs, other downloads etc) there are a number of third party utilities that you can use to retrieve the music files and playlists from your iPod. You'll find that they have varying degrees of functionality and some will transfer movies, videos, photos, podcasts and games as well. You can read reviews and comparisons of some of them here:
iTunes & iPod software
Wired News - Rescue Your Stranded Tunes
Comparison of iPod managers
A selection of iPod to iTunes utilities:
TuneJack Windows Only (iPhone and iPod Touch compatible)
SharePod Windows Only (iPhone and iPod Touch compatible)
iPod2PC Windows Only
iDump Windows Only
YamiPod Mac and Windows
iPod Music Liberator Mac & Windows
Floola Mac & Windows
iPodRip Mac & Windows (iPhone and iPod Touch compatible)
iPod Music Liberator Mac & Windows (iPhone and iPod Touch compatible)
Music Rescue Mac & Windows (iPhone and iPod Touch compatible)
iGadget Mac & Windows (iPhone and iPod Touch compatible)
iRepo Mac & Windows (iPhone and iPod Touch compatible)
iPod Access Mac & Windows (iPhone and iPod Touch compatible)
TouchCopy Mac & Windows (iPhone and iPod Touch compatible)
There's also a manual method of copying songs from your iPod to a Mac or PC. The procedure is a bit involved and won't recover playlists but if you're interested it's available on page 2 at this link: Copying Content from your iPod to your Computer - The Definitive Guide

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