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RAID 1/0 Disk Groups
In a CX document, it says that RAID-1/0 Groups consists of 4, 6, 8, 12, 14 or 16 disk modules.
Why can't you have a RAID 1/0 Group consists of 10 disks - RAID 1/0 5+5? Is it still best practice to limit the RAID 1/0 Group to 10 drives, or does this best practice only limits to RAID 5 Parity Groups?
Why can't you have a RAID 1/0 Group consists of 10 disks - RAID 1/0 5+5? Is it still best practice to limit the RAID 1/0 Group to 10 drives, or does this best practice only limits to RAID 5 Parity Groups?
emcers
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February 16th, 2008 18:00
DGM3
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February 16th, 2008 21:00
consists of 4, 6, 8, 12, 14 or 16 disk modules.
Can you please let me know which document that was? RAID 1/0 groups are supported with any number of even drives, from 2 to 16 inclusive. Or to be very clear, the following number of drives: 2, 4, 6, 8, 10, 12, 14, 16
The commentary in Best Practices about "10 drives" is fairly specific and should not be interpreted as being broadly applicable. What it says is; "For high bandwidth workloads, RAID 5 groups with more than 10 drives should be avoided" - see the Release 26 update, page 37.
Regards,
DGM
DGM3
238 Posts
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February 16th, 2008 21:00
Yes, 2-drive RAID 1/0 groups are support by current revisions of Flare (older revisions had a 4-drive minimum). Support was added for 2-drive RAID 1/0 groups to allow for a 2-drive mirror to be expanded into a 4-drive mirror (or larger). Or said another way; a RAID 1 group is always exactly 2 drives, however a RAID 1/0 group initially created with 2 drives can later be expanded.
Regards,
DGM
emcers
63 Posts
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February 16th, 2008 21:00