On Wednesday, April 13, 2011 04:54:01 AM Ross Walker wrote:
On Apr 12, 2011, at 8:53 AM, Rudi Ahlers Rudi@SoftDux.com wrote:
...
As matter of interest, what hardware do you use? i.e. what CPU's, size of RAM and RAID cards do you use on this size system?
Everyone always recommends to use smaller RAID arrays than one big fat one. So, I'm interested to know what you use, and how effective it works. i.e. if that 30TB was actively used by many hosts how does it cope? Or is it just archival storage?
I would never create a RAID5/6 greater then 8 disks. Usually I create a 6 or 7 disk RAID5 which means I can fit 2 in a 15 disk enclosure and have a hot spare and stripe them.
Personal preference here, personal preference there. Here's a datapoint: We run >PB of data on 12 drive raid6 using sata (no hot spare). Are we happy with that config: yes, would it be faster to use 15K sas in raid10: yes *shrug*
/Peter
The more RAID5 sets you have the greater the write IOPS you can achieve.
Though for max IOPS nothing beats RAID10.
-Ross