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Re: Performance problems with Seagate Barracuda ES.2 harddisks
Matthias Scheler wrote:
> I got a HP Proliant ML110 G4 running a NetBSD/amd64 4.99.69 GENERIC kernel.
> I've recently added two Seagate Barracuda ES.2 SATA harddisk. They work
> fine but the filesystem performance is very poor. In the table below
> "wd0" is an older Seagate FB160C4081 harddisk, "wd1" and "wd2"
> are the new harddisks:
> dd read(*) dd write(**) tar(***)
> wd0 74MB/sec - 4:11min
> wd1 104MB/sec 102MB/sec 14:22min
> wd2 108MB/sec 102MB/sec 14:06min
> dd_read: dd if=/dev/rwd<n>d of=/dev/null bs=1m count=2048
> dd_write: dd if=/dev/zero of=/dev/rwd<n>d bs=1m count=2048
> tar: Extracting the NetBSD 4.0 source tar archives to an empty
> filesystem with a size of 9 to 10GB. The tar archives are
> located on a tmpfs filesystem.
> Can anybody explain why "wd1" and "wd2" are so slow? I've used "dkctl"
> to make sure that the write-cache is enabled on all harddisks.
Do you have softdep on wd0 but not on the others? I vaguely remember
softdep achieves a big gain for extracting source archives.
Also have you tried dd if=/dev/zero of=/file/on/filesystem bs=1m
count=2048. That should show if file writing is fast or not.
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