81 lines
3.7 KiB
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81 lines
3.7 KiB
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From fork-admin@xent.com Wed Sep 18 11:52:23 2002
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From: Wayne E Baisley <baisley@alumni.rice.edu>
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Subject: Re: storage bits
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References: <Pine.LNX.4.33.0209170748460.14309-100000@hydrogen.leitl.org>
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Date: Tue, 17 Sep 2002 23:20:31 -0500
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At Fermi (yes I'm back there; long story), we're buying 4U systems like
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the fiscal year is ending. We have ~20 ASA IR4US1 systems (not pushing
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them, there are some other similar units available), with 60 more on
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order. They're 2-1/2 TB for $10K, although we add a separate IDE or
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SCSI system disk, because the 3Ware RAID controllers can saturate.
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Intel SDS2 motherboard, 2 1.4GHz P3s, 2 GB ram, 2 3Ware 7850 Raid
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controllers, 16 160GB Maxtors, SysKonnect gigabit enet, Fermi RedHat 7.3.
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http://www.asacomputers.com/cgi-bin/index.fcg?action=displayscreen&templateid=25
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There's some interesting info at:
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http://mit.fnal.gov/~msn/cdf/caf/server_evaluation.html
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We've decided to go with XFS (which Linus has just merged into the 2.5
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tree), mostly because none of the other journaled fs's can maintain >30
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GB/s rates with a nearly full filesystem (mostly GB files) with random
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deletions (we use these systems for caching our 2 petabyte tape store).
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Ext3 almost did it but dropped from from ~38MB/s to 10 with random
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deletions, and didn't want to do direct io at all. Only concern is an
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occasional system lock-up we haven't chased down yet. A load avg > 100
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is always a patio of fun.
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Oddly, even fairly beefy systems like these will breathe hard to keep up
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with the new STK 9940B tape drives, which crank along at a steady
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30GB/s. And you oldforktimers will remember "doofus" my old file server
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system. It would only take 2.1" of rackspace now, instead of 14 racks.
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Cheers,
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Wayne
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