zpool - low speed write

[Jeremy Chadwick]

On Wed, Aug 04, 2010 at 10:13:36PM -0400, Joshua Boyd wrote:
> On Wed, Aug 4, 2010 at 10:13 AM, Alex V. Petrov <alexvpetrov at gmail.com>wrote:
> 
> > interesting results:
> >
> > From single-UDF-disk to pool:
> > $ dd if=petrovs-disk1.iso of=/tank/petrovs-disk1.iso bs=1M
> > 3545+1 records in
> > 3545+1 records out
> > 3718002688 bytes transferred in 438.770195 secs (8473690 bytes/sec)
> >
> > From single-UDF-disk to null:
> > $ dd if=petrovs-disk1.iso of=/dev/null bs=1M
> > 3545+1 records in
> > 3545+1 records out
> > 3718002688 bytes transferred in 83.304575 secs (44631435 bytes/sec)
> > ------
> > Alex V. Petrov
> > _______________________________________________
> > freebsd-stable at freebsd.org mailing list
> > http://lists.freebsd.org/mailman/listinfo/freebsd-stable
> > To unsubscribe, send any mail to "freebsd-stable-unsubscribe at freebsd.org"
> >
> 
> What controllers are you using?
> 
> What's the results of dd if=/dev/ada4 of=/dev/null bs=1M count=100 ?

His problem is with writes, not reads.

I strongly doubt his problem is with the controller (Intel ICHxx and
ESBxx controllers are heavily tested on FreeBSD, both with and without
AHCI, including ahci.ko).

-- 
| Jeremy Chadwick                                   jdc at parodius.com |
| Parodius Networking                       http://www.parodius.com/ |
| UNIX Systems Administrator                  Mountain View, CA, USA |
| Making life hard for others since 1977.              PGP: 4BD6C0CB |