Andy Huebner wrote:
We use RAID 5 (5+1) on a Clariion using 146GB drives. We peak the drives at over 55MB/sec, sustained speed is over 45MB/sec. How fast are you reading and writing to your disks? If it is faster than your SAN storage can read and write from RAID 5 then mirroring or striping is a better choice, although I would not use unprotected disks.
Andy Huebner
-----Original Message----- From: ADSM: Dist Stor Manager [mailto:[EMAIL PROTECTED] On Behalf Of Luc Beaudoin Sent: Tuesday, May 10, 2005 7:47 AM To: [email protected] Subject: [ADSM-L] Diskpool question
My diskpool is on a SAN, I have to increase the size cause I'm taking about 450GB per day and my diskpool is 350GB...
Is there a RAID issue for performance .... right now my diskpool is on a RAID5 ... should I still use RAID5 or there a better RAID configuration??
thanks
Luc
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Just for information, EMC did not optimize the FlareCode on Clariion for RAIDGroup with even disk (3+1, 5+1, ...) so It could be better to use 4+1, 6+1, 8+1 RAIDGroup (See Clariion Best Practises on Powerlink). We use a 4+1 configuration and during our backup database we have a sustained speed of 70-80 MB/s.
Stripe on each disk is 64KB lenght, for four disk you have a full data stripe of 256KB (4x64KB + 64KB Parity) and th default LTG size of AIX Volume Group is 128kB.
