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From: ft@angels.att.com
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Date: Wed, 25 Jun 1997 12:39:05 -0400 (EDT)
Original-From: Fred True <ft@angels.att.com>
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To: SSA Managers <ssa-managers@Eng.Auburn.EDU>
Subject: Re: Boot from Raid
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On Wed, 25 Jun 1997, Margarita Suarez wrote:
> > > 2) why the 51927b block size? Is there something special about this
> > > size?
>
> we've found that using bs=5120k means we can copy a 2gig disk in under
> 10 minutes. 51k seems awfully small...
Actually, using a block size larger than your setting of the 'maxphys'
kernel tunable, or the block size supported by the disk drives themselves
(klustsize, usually 64-256k), whichever comes first, is probably not going
to get you much, as the reads/writes will get fragmented down in the
vfs/vnode interface anyway.
Try timing this yourself by timing the transfer of a fixed amount of data
from (or to) /dev/rdsk/<somedisk> using dd and varying bs,count (assuming
your machine is fast enough that dd doesn't saturate a CPU). You can
pretty much see where klustsize is for any given disk this way. For a
SSA112 2.1G disk and a 10MB read:
bs (k) time (s)
2 8.47
4 4.85
8 3.04
16 2.13
32 1.69
64 1.57
128 1.57
256 1.60
512 1.59
1024 1.56
Fred
--
Fred True "My name is Ozymandias, King of Kings:
AT&T World Class Database Development Look on my works, ye Mighty,
ft@angels.att.com and despair!"
-P. B. Shelley