Disk performance figures on PE2650

Rechenberg, Andrew ARechenberg at shermanfinancialgroup.com
Wed Mar 26 08:05:01 CST 2003

I don't have any for PERC3/Di (Adaptec chipset) but I can tell you that
the PERC3/[QD]C (LSI chipset) are pretty abysmal compared to Linux
software RAID.

Basic tests (hdparm -t) for 7 disk HW v SW RAID0 (PERC3/QC v Linux RAID)
show almost a 50% increase in sequential read of 64MB file with SW RAID
(HW: 98MB/s SW: 138MB/s).

I am a firm believer in Linux software RAID.

We do have some test hardware with a Di in it.  When my co-worker gets
done using it, I'll put my Linux disk back in there and run some
bonnie++ tests on an 8 disk RAID10 on the Di and a RAID10 software array
to give you some data.

Talk to you later,

>> -----Original Message-----
>> From: ahorn at deorth.org [mailto:ahorn at deorth.org] 
>> Sent: Tuesday, March 25, 2003 6:59 PM
>> To: linux-poweredge at dell.com
>> Subject: Disk performance figures on PE2650
>> Folks,
>> Does anyone have any figures for disk I/O tests (bonnie, 
>> iozone, etc...) on a poweredge 2650 with the various 
>> different raid cards and raid configs?
>> I'm having what seem to be disk I/O troubles with a 2650 and 
>> PERC3/Di raid card and I'm trying to ascertain if it's 
>> expected hardware performance or a linux issue.
>> Cheers,
>> Al
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