Mailinglist Archive: opensuse (1986 mails)

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Re: [opensuse] wait times excessive high {Suse 10.3 & 11}
  • From: Randall R Schulz <rschulz@xxxxxxxxx>
  • Date: Wed, 19 Nov 2008 13:25:33 -0800
  • Message-id: <200811191325.33960.rschulz@xxxxxxxxx>
On Wednesday 19 November 2008 10:12, Per Jessen wrote:
Greg Freemyer wrote:
If you want to test it on a single drive, at least use dd to do
your benchmarking.

These are my numbers for a 20G file on RAID1 over two SATA drives:
dd if=/tmp/file1 of=/tmp/file2 bs=512
dd if=/tmp/file1 of=/tmp/file2 bs=4k

I didn't bother with those two.

dd if=/tmp/file1 of=/tmp/file2 bs=1M

27m28s 13Mb/sec

dd if=/tmp/file1 of=/tmp/file2 bs=1000M

17m34s 20Mb/sec

That's not really a correct computation. Every byte (or sector or
whatever) must be read once and written once, and you have to account
for both the read and the write traffic.

40 GB = 42949672960 bytes

27m28s = 1648 s
26,061,695 bytes / s

17m34s = 1054 s
40,749,215 bytes / s

/Per Jessen, Z├╝rich

Randall Schulz
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