Which external disk for RAC at home?

Dear Experts,
Years ago, I tried installing RAC at home on Linux 2.1.
With 2 Dell machines and a firewire external disk.
I was only partially successful.
Today, with Oracle 11, what would be a good external harddisk
to use? A small external NAS, or SAN through the router,
with Oracle Clusterware? Something else?
Multiple VMs with a single internal disk?
This detail is important!
Thanks a lot!

You can go the external shared disk route or you can even go the nfs mounts way. Here is the virtualization route:
http://www.oracle-base.com/articles/10g/OracleDB10gR2RACInstallationOnCentos4UsingVMware.php
Perhaps virtualization is the cost effective way (although it is no where the production grade)
Good Luck

Similar Messages

OVM disks for RAC implementation

Dear All
is there any guide available on how can you create the disks for RAC ASM in OVM 3.3.1 using a fiber channel block level storage?
Thanks
George

You are right, you can't use virtual disks for RAC configuration. Have a look here (especially page 18):
http://www.oracle.com/technetwork/products/clustering/oracle-rac-in-oracle-vm-environment-131948.pdf
Using physical disks means that you create LUNs on your storage array connected to Oracle VM Servers by fabric channel. You map these LUNs to all servers in the pool or all standalone servers where you are going to install your virtual machines being Clusterware nodes. Then you rediscover storage in Oracle VM Manager, mark these LUNs as "shared" in OVMM and add them to your virtual machines as "Physical disks" (by editing guest properties in OVMM).
Alternatively you can directly map iSCSI or NFS storage to your guests. By "directly" I mean you use IP addresses and software in your guests as iSCSI initiator or NFS client - without engaging Oracle VM in the middle.
Regards,
Michal

Am trying to transfer iTunes library to an external disk for back-up purposes. have followed normal protocol i.e. locating iTunes file in Music folder and dragging across to external disk icon. However, nothing seems to happen. Any advice please?

Am trying to transfer an iTunes library to an external disk for back up. Have followed normal instructions by locating iTunes folder in Music file and dragging across the iTunes folder to the external disk icon. Nothing happens. No notifications. Just a very pregnant pause. Any advice gratefully appreciated.
Michael L J

Welcome to Apple Support Communities
The external drive must be formatted in "Mac OS Extended (Journaled)", exFAT or FAT32, because OS X can't write in NTFS partitions by default.
As you just want the library on the external drive to make a backup of your library, you can format it in "Mac OS Extended (Journaled)" by using Disk Utility > http://pondini.org/OSX/DU1.html (Note that you won't be able to use the external drive with PCs unless you install a special application in them).
Finally, drag your iTunes folder to your external drive

External disk for iPad available?

Is there an external disk for iPad now? Not like in two years.

No. But you can purchase the Camera Connection Kit that can be used to connect to a USB drive. However, to the iPad the drive is read-only, and not all USB drives will be recognized.
iPad- Using iPad Camera Connector with unsupported USB devices
iPad- Using the iPad Camera Connection Kit

How Prepare Disks for RAC installation

How configure disks for RAC instalation for Windows Enterprise Server 2003

Best resource for RAC on Windows:
www.jobcestbon.com/oracle/RacOnWindows.pdf
HTH
Thanks
-Chandra PabbaI read it, but i unable to configure Shared Memory accourding to this link. Please guide me how i can configure shared Memory for RAC in Windows Server Enterprise 2003.
Thanks

Shared Disks For RAC

Hi,
I plan to use shared disks to create Oracle RAC using ASM. What options do I have? OCFS2? or any other option?
Can some one lead me to a documnet on how can I use the shared disks for RAC?
Thanks.

javed555 wrote:
I plan to use shared disks to create Oracle RAC using ASM. What options do I have? You have two options:
1. Create shared virtual, i.e. file-backed disks. These files will be stored in /OVS/sharedDisk/ and made available to each guest
2. Expose physical devices directly to each guest, e.g. an LVM partition or a multipath LUN.
With both options, the disks show up as devices in the guests and you would then provision them with ASM, exactly the same way as if your RAC nodes were physical.
OCFS2 or NFS are required to create shared storage for Oracle VM Servers. This is to ensure the /OVS mount point is shared between multiple Oracle VM Servers.

Doubts about shared disk for RAC

Hi All,
I am really new to RAC.Even after reading various documents,I still have many doubts regarding shared storage and file systems needed for RAC.
1.Clusterware has to be installed on a shared file system like OCFS2.Which type of hard drive is required to install OCFS2 so that it can be accessed from all nodes??
It has to be an external hard drive???Or we can use any simple hard disk for shared storage??
If we use external hard drive then does it need to be connected to a seperate server alltogether or can it be connected to any one of the nodes in the cluster???
Apart from this shared drives,approximately what size of hard disk is required for all nodes(for just a testing environment).
Sincerely appreciate a reply!!
Thanks in advance.

Clusterware has to be installed on shared storage. RAC also requires shared storage for the database.
Shared storage can be managed via many methods.
1. Some sites using Linux or UNIX-based OSes choose to use RAW disk devices. This method is not frequently used due to the unpleasant management overhead and long-term manageability for RAW devices.
2. Many sites use cluster filesystems. On Linux and Windows, Oracle offers OCFS2 as one (free) cluster filesystem. Other vendors also offer add-on products for some OSes that provide supported cluster filesystems (like GFS, GPFS, VxFS, and others). Supported cluster filesystems may be used for Clusterware files (OCR and voting disks) as well as database files. Check Metalink for a list of supported cluster filesystems.
3. ASM can be used to manage shared storage used for database files. Unfortunately, due to architecture decisions made by Oracle, ASM cannot currently be used for Clusterware files (OCR and voting disks). It is relatively common to see ASM used for DB files and either RAW or a cluster filesystem used for Clusterware files. In other words, ASM and cluster filesystems and RAW are not mutually exclusive.
As for hardware--I have not seen any hardware capable of easily connecting multiple servers to internal storage. So, shared storage is always (in my experience) housed externally. You can find some articles on OTN and other sites (search Google for them) that use firewire drives or a third computer running openfiler to provide the shared storage in test environments. In production environments, SAN devices are commonly employed to provide concurrent access to storage from multiple servers.
Hope this helps!
Message was edited by:
Dan_Norris

My Time Machine will no longer back up to my external disk for unknown reasons. It would not accept my password and said the disk is read-only and damaged. How can I copy my files to my Mac so I can repair it?

My Time Machine will no longer back up to my external drive for unknown reasons. It began after a series of power outages (my equipment is protected by a surge protector with battery backup), and was shut down correctly. Then it began by not recognizing my disk and my Time Machine password, although I am positive it was correct. I tried NUMEROUS times to get into it. It says the disk is damaged and needs to be erased and started over. How can I back up my files on my Mac so I can do that? I have no other disk to back up to. I found the files in a folder called "Backups.backupdb", and tried to copy them into a folder, but get the message "The volume has the wrong case sensitivity for a backup." The "lost+found" folder did copy for me. Will I just have to lose 4 years of backups?

Hi there,
I have the same issue. Usually hangs after 10K od sometimes after 18MB of backup file.
Config: iTunes 10.4., Win 7 64bit, iPhone 4 with iOS 4.3.3
I tried all of these without success:
- deleted backups via iTunes / Preferences
- deleted backups from sync folder
- created a new admin user and tried to sync
- reinstalled iTunes
- ran all Windows updates, restarted, reinstalled iTunes
- ran iTunes / Diagnostics (says everything okay, only info which is strange: diag says I am not a admin user, which is not correct)
Nothing helped. Who can help. I hope someone from Apple can take care, as I seem not to be the only one. Actually iTunes is the worst part about iPhone. Hope with iOS 5 and Cloud sync to get rid of iTunes.
Any hints welcome,
Cheers,
Miguel-KA

External disk for Time Machine and Aperture Vaults

I'm planning on buying an external HD for backups with Time Machine and I will also be using it for Vaults in Aperture.
Should I partition the disk into two volumes, one for each, or will TM and Aperture co-exist quite happily on the same volume?
I'd rather use a single volume as, in my experience, partitioning a disk always results in one volume filling up long before the other, however integrity of the backups is the most important requirement.

I strongly agree with V.K.
The other big reason to partition is, as you say, one volume will fill up before the other.
That's exactly how TM is designed to work -- fill up whatever space you allocate to it. Unlike traditional archive-type backup systems, it manages it's space and deletes backups automatically. As you probably know, it keeps it's hourly backups for 24 hours, then deletes them, except the first of the day, which becomes a daily backup and is kept for a month. Similarly, after a month, one of those daily backups becomes a weekly, and the others are deleted. But the weeklies are kept as long as there's room. Unless something goes wrong, you never have to do a thing.
So, if you have other data in that same partition, TM will, eventually, fill up the remaining space, limiting the space available to Aperture.

Redo log groups/files on the local disk for RAC DB

Whether is it possible/supported to place redo log files/groups on the local disk for a RAC databases ?
Thank you,

Hi Mufalani,
are you sure about this one? I'd think that this only works as long as the nodes don't restart/crash. I can imagine this like this:
The nodes store redo logs on local disks which are NFS-exported to the other node. Everything should be fine. But when one node crashes/reboots, the other one has to perform crash recovery for the crashed instance but this won't work when the NFS mount (with redo logs) is unaccessible. So I would not want to do this.
Bjoern

External procedures for RAC system

Hi Experts,
I have 4 nodes 11.1 RAC in red hat. I saw some node listener configuration with IP=FIRST and other nodes does not have IP=FIRST entry.
I made a search onlin and get statement as IP=FIRST at listening endpoints are for external procedures in the database.
I want to know which means is for external procedures in RAC ? does expert can show some example ?
Thanks
JIm

No the IP=FIRST is not for external procedures. It is to restrict the listener to listening on the specific IP address specified not just the port on any address. This is explained in the NET SERVICES GUIDE

Proven external disk for Time Machine backups?

I'm looking for a good, reasonably priced, external disk to temporarily use for Time Machine backups. My 10.9.4 install is messed up and Time Machine no longer works with my ReadyNAS NV+ system. I want to use the disk to backup my MBP and reinstall the OS. Can someone please suggest a proven external disk (2TB+) with a USB 2.0 (or Ethernet) interface?
Thanks,
Ira

Hello all,
I decided to give my 2007 MBP one last upgrade with a new 1TB internal disk that I will install with 10.9.4 from scratch and will (slowly) migrate all my digital hoarding over to it. I've been using the same OWC FW800/USB enclosure since upgrading the original 160GB disk way back when. If TM still doesn't work with the new install (which will narrow down the TM issue to the ReadyNAS NV+), then I will put the current 750GB disk into the enclosure, flash it, and retry TM.
For the record, I chose the HGST Travelstar 2.5-Inch 1TB 7200RPM SATA 6GB/s 32MB Cache internal disk. It was just $75 from Amazon and I used Amazon Points to pay for half of it.
Regards,
Ira

I want to use my Macbook Air 2011 as an external disk for my iMac 2011. I connected the two with a Thunderbolt cable and when starting the MacBook Air I pressed "T" and it worked except with Office documents. Can anybody help?

I want to use my MacBook Air as an external disk to my iMac. I talked to Apple care and we solved it by connecting a Thunderbolt cable between the two computers. I then turn on the MacBook Air while pressing the "T" and it works. I can sit and work on my iMac and grab/change/save the files that are in my MacBook Air EXCEPT for the Microsoft Office files. I called Microsoft and they can't solve it. They say it might be a problem with the Thunderbolt cable. Has anybody have this problem?
Both computers are 2011 and they both have Office 2011.
Thanks in advance,
Alejandra

For Word it says "Word cannot open this document. The document might be in use, the document might not be a valid Word document, or the file name might contain invalid characters (for example, /)"
For Excel it says "the file could not be found. Check te spelling of the filename, and verify that the file location is correct. If you are trying to open the file from your list of most recently used files on the File menu, make sure hat the file has not been renamed, moved or deleted.
I tried this with many different documents, and I always get the same message.

MacBook won't recognize external disk for Time Machine

Help!
My husband now has my old MacBook (white, 2008). It's running the latest version of Snow Leopard.
He also has his old Mac Mini (PowerPC, not Intel). Its optical drive is failing, so I decided he could use it as a TM backup disk.
Last night, I connected it to his MacBook with a FireWire cable, convinced it to start up in Target Disk mode, wiped it clean with Disk Utility, and told Time Machine, "Hey, look, here's a disk for you!". TM immediately began a full backup, which completed successfully. It did a few more little "mini backups" (as TM does) while he was using the computer. When we went to bed, he closed the MacBook but didn't eject the Mini or turn it off.
When I looked at the Mini this afternoon, it was off. I figured it had shut itself down or whatever. I opened his MacBook and started up the Mini, but it doesn't mount and the MacBook can't see it in Disk Utility. (And yes, the very first thing I did was check the FireWire cable's connection, LOL. It's fine.)
So what just happened here? IDEK.
Thanks in advance!

A.Carlo wrote:
The Mini cannot boot up. Since you wiped out its operating system, it's not able to get up and running. It works only while in Target Disk mode, but rebooting it without holding down the T key to enter Target Disk mode pretty much means it's waiting for an operating system to load.
OMG, I don't know how I could be so stupid, because I totally know how Target Disk Mode works! Clearly, I cannot brain today; I have the dumb.
I connected a USB keyboard to it and booted up while holding down the "T" key, and it showed up on the desktop. TM is now backing up.
Thank you!

Advice request - which external HDD for Adobe Lightroom?

Hi,
I'm going to buy myself an external hdd this week, and I would be very grateful for your advice.
1) I'm shooting with Nikon D70, Canon A520, and my mobile(;]).
2) After over 1 year of shooting I have ~130GB of photos taken with these cameras + I have some negative from analog times, which I'm going to scan (I estimate them to be next ~20GB)
3) I would like to keep all of above photos on external hdd and import them into Abobe Lightroom (tagging + developing), and and of course apply retouching to some of them in PS CS2.
4) My computers are : old PC desktop with XP, on which I will be only viewing these pictures, and IBM T43 with Vista on which I'm going to do all the developing. [Yes, I know that Apple is better, and I love Apple, but I can'tafford one yet].
Given above assumptions, which external hdd from the ones I've preselected should I choose ? I'm on the budget here, and the ones that I can afford are :
WD My Book Pro 250GB USB 2.0/FireWire400/FireWire800 16MB Cache
WD My Book Premium 320GB USB 2.0/FireWire400 8MB Cache
WD My Book Essential 500GB USB2.0 8MB Cache
LaCie Porsche 500GB USB 2.0 8MB Cache
I'm asking mainly because I don't have any idea about how fast should a drive be to work with Lightroom with decent speed.
Also : should I buy FireWire controller for my T43 laptop, or will USB 2.0 be enough for my purposes ?
Thanks in advance for sharing your experience.
Chris

>Yes, I know that Apple is better, and I love Apple, but I can't afford one yet
Either a PC or MAC is fine, but you've entered a field where affordability is proportional to the number of photos you manage, the type of processing you perform and the level of security you are comfortable with. This is entirely separate of your budget.
USB2 and/or Firewire Drives work fine. From your list, I've owned both the LaCie Porsche and a WD MyBook. They both failed for different reasons. All hard drives will eventually fail. If you can't afford to lose your photo library you need some sort of redundency. The reliability of that redundency (RAID) and or speed of retrieval determines what technology is the minimum you need to afford. Or, if you have more time than budget, you can archive on DVDs. Keep in mind that even DVD's will fail over time.
The faster the drive, the faster the backup (redundency), the faster the throughput, and the faster you have access to managing and processing your image library.
Did I answer your question: No. However, whatever you get, and assuming you value your photos, make sure you get two of them so you can build some redundency into your budget. If you're feeling lucky, get the largest drive you can afford and make sure you leave yourself a lot of time for those backups.
Welcome to "photo shoebox management" of the new millenium! It ain't cheap ... :-)

Which external disk for RAC at home?

Similar Messages

Maybe you are looking for