Hi Peter,
I am running such a setup on SLES9 64bit 10.2.0.x on a DS4800.
Striping over striped devices scattered performance very much. My best
solution was to do every raid operation via ASM. Now I use arrays like disks:
RAID5 arrays, stripe over them by ASM (more arrays in one failgroup) and
mirror them to another bunch of arrays (normal redundancy). If one fails, I
replace it completely within ASM (not physically).
Amazon does so with cheap, dumb raid subsystems, and they are running very
fast on it.
I do my performance monitoring by storage delivered tools, and grid
control/database control.
Don't know if it helps. You are welcome to write back, since I am interested
in different experiences all the time. These systems are seldom found :)
Am Donnerstag 05 April 2007 15:39 schrieb Peter Santos:
> Guys,
> I'm wondering if any of you have had a chance to test ASM performance
> against a RAID 10 vs RAID 1 device. This is the concern:
>
> ASM does 1 MB file extent stripping, and so does it make sense to use a
> raid device that is also stripped .. specially if the storage cannot strip
> with such large strip size?
>
> The question would be, does one get better IOPS and MB/s with ASM against
> a raid device that is just mirrored or a raid device that is mirrored and
> stripped with a stripe size that is a multiple of 1MB?
>
> I spoke to an Oracle architect way back about this, and he said it doesn't
> really matter, but that if you can strip at the storage level, then you
> should!
>
> Does anyone have experience testing this? The IO workload that I'm
> concerned with is lots of small random ios + large read-only sequential ios
> ?
> I'm familiar with Oracle's tool Orion for testing IO, but I'm wondering if
> anyone has tested this out ?
>
> Any feedback is greatly appreciated!
> BTW, my environment is ( SuSe Enterprise 10 x86_64 + 10.2.0.3 + storage
> (DS4400 Disk Systems (FAStT 700))
>
> -peter
--
Freundliche Grüße
i.A.
Martin Klier
Systemadministration/Datenbanken
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