[Gluster-users] RAID options for Gluster

[George Machitidze]

Hi,

Some corrections...

Cons:
> Extra cost of the RAID controller.
> Performance of the array is equivalent a single disk + RAID controller
> caching features.
> RAID doesn’t scale well beyond ~16 disks


Performance of the array is not equivalent of a single disk and doesn't
depend only on cache size or spec. features - it depends on the total IOPS,
block sizes, access type etc.

RAID scales well beyond 16 disks, ex. for Adaptec. Yes, it will scale, but
is it software or hardware, for both array reconfiguration and grow is the
same kind of problem - data needs to be reallocated.

Maximum Number of Arrays that can be created on the same set of drives: 4
Maximum Logical Drive Size: 512TB
Maximum Number of Drives in Striped Array (such as RAID 0): 128
Maximum Number of Drives in RAID 5 Array: 32
Maximum Number of Drives in RAID 50 Array: 32
Maximum Number of Drives in RAID 6 Array: 32
Maximum Number of Drives in RAID 60 Array: 32
Available Stripe Sizes for Arrays are 16, 32, 64, 128, 256, 512, or 1024
KB. Striped RAID configurations have a default stripe size of 256 KB.
Note: A RAID 10, RAID 50, or RAID 60 array cannot have more than 32 legs
when created using the Build method. Maximum disk drive count is only
limited by RAID level. For instance:
a RAID 10 array built with 32 RAID 1 legs (64 disk drives) is supported
a RAID 50 array built with 32 RAID 5 legs (number of drives will vary) is
also supported


Best regards,
George Machitidze


On Thu, Jun 14, 2012 at 3:06 PM, Fernando Frediani (Qube) <
fernando.frediani at qubenet.net> wrote:
> Cons:
>
> Extra cost of the RAID controller.
>
> Performance of the array is equivalent a single disk + RAID controller
> caching features.
>
> RAID doesn’t scale well beyond ~16 disks
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://supercolony.gluster.org/pipermail/gluster-users/attachments/20120614/86d9e12a/attachment.html>