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Vellemannv
1 Rookie
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3 Posts
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January 20th, 2014 01:00
Difference RAID disk group / virtual disks
Hello,
What's the difference or profit with making RAID groups or virtual disks for a RAID configuration? For example, what's the difference with the situation below:
PERC controller:
Disk group 0, RAID 1
- ID: 0, 1 virtual disk with 2 physical disks
Disk group 1, RAID 1
- ID: 1, virtual disk with 2 physical disks
OR
PERC controller:
Disk group 0, RAID 1
- ID: 0, 1 virtual disk with 2 physical disks
- ID: 1, 1 virtual disk with 2 physical disks
DELL-Geoff P
990 Posts
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Posted January 20th, 2014 07:00
Either scenario would be viable; the first one appears to be on a PERC sas controller; the second looks like it could be on a PERC SCSI controller.
More details on the controller and server that its in would be extremely helpful.
Regards,
Vell...
assuming the second scenario presented by you is correct , really a raid 10...
Both are viable but if two VD are on the same disk group as in your second option , should you go into a VD failure, you lose both VDs. Stick with two disk groups of raid 1 for safety or the second (raid 10) for speed; there is a big speed difference between raid 1 and raid 10 . Most servers, with a limited resource budget would be set up with a raid1, for the OS, and another raid for data. If you could go for another 2 disks, you could get 2 small disks for the OS (approx. 100GB) in a raid 1 array, then use the original disks for another array of raid 10.
Dev Mgr
6 Operator
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9308 Posts
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3 Points
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Posted January 20th, 2014 07:00
If it's 1 diskgroup with multiple virtual disks, each of those virtual disks will distribute across all the disks in the diskgroup.
So I assume you meant to say:
Disk group 0, Raid 1 - 2 physical disks
- 1 single virtual disk, max size
Disk group 1, Raid 1 - 2 physical disks
- 1 single virtual disk, max size
OR
Disk group 0, Raid 10 - 4 physical disks
- 2 virtual disks of the same or different size