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Re: Off-list Re: Alternatives to Dell?

From: Vivek Khera <khera(at)kcilink(dot)com>
To: pgsql-performance(at)postgresql(dot)org
Subject: Re: Off-list Re: Alternatives to Dell?
Date: 2004-12-13 17:19:24
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-performance
>>>>> "JB" == Josh Berkus <josh(at)agliodbs(dot)com> writes:

>> FYI ... the 750s, 1850s and 2850s use Intel chipsets (E7520 on 1850s
>> and 2850s, 7210 on 750s), Intel NICs, and come only with LSI Logic
>> RAID controllers.  It looks like Dell has dropped the
>> Broadcom/ServerWorks and Adaptec junk.

JB> I don't know if Vivek is on this list; I think he just had a
JB> critical failure with one of the new Dells with LSI.

I'm here, but time delayed :-)

No critical failures on the Dell, just performance failure.  It can't
keep up.  You'd think with a box like this:

Dual Xeon (32 bit)
PERC3 (LSI based controller) dual channel
chan0: RAID1 two disks for OS + pg_xlog
chan1: RAID5 14 disks U320 18Gb
FreeBSD 4.10
PG 7.4.6

I should get better than a sustained 6MB/s I/O throughput with peaks
to 30MB/s and about 30% the tracks/sec others report with name-brand
LSI controllers with Opteron systems.

The computer is wicked fast, but the I/O can't hold up, and I can't
get a straight answer as to why.

I'm no closer to solving the vendor problem than anyone else here.

Vivek Khera, Ph.D.                Khera Communications, Inc.
Internet: khera(at)kciLink(dot)com       Rockville, MD  +1-301-869-4449 x806
AIM: vivekkhera Y!: vivek_khera

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Subject: Re: Hardware purchase question
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