Date: Mon, 9 Aug 2010 02:31:55 +0800 From: "Alex V. Petrov" <alexvpetrov@gmail.com> To: Jeremy Chadwick <freebsd@jdc.parodius.com> Cc: freebsd-stable@freebsd.org Subject: Re: zpool - low speed write Message-ID: <201008090231.55712.alexvpetrov@gmail.com> In-Reply-To: <20100805061959.GA92106@icarus.home.lan> References: <201008042008.25679.alexvpetrov@gmail.com> <201008051409.57751.alexvpetrov@gmail.com> <20100805061959.GA92106@icarus.home.lan>
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> > If only one of the dds shows bad throughput, then please: > > - Install ports/sysutils/smartmontools and run smartctl -a /dev/XXX, > where XXX is the disk which has bad throughput > - Try making a ZFS pool with all 3 disks, but then do "zpool offline > tank XXX" and then re-attempt the following dd: > dd if=/dev/zero of=/tank/test.zero bs=64k count=1000000 > And see what throughput looks like. > zpool destroy tank zpool create tank ad8 ad10 ad12 dd if=/dev/zero of=/tank/test.zero bs=3M count=1000 1000+0 records in 1000+0 records out 3145728000 bytes transferred in 83.219741 secs (37800262 bytes/sec) zpool offline tank ad10 cannot offline ad10: no valid replicas zpool destroy tank zpool create tank ad8 ad12 dd if=/dev/zero of=/tank/test.zero bs=3M count=1000 1000+0 records in 1000+0 records out 3145728000 bytes transferred in 126.873102 secs (24794286 bytes/sec) dd if=/dev/zero of=/tank/test.zero bs=64k count=1000000 1000000+0 records in 1000000+0 records out 65536000000 bytes transferred in 1735.680273 secs (37758106 bytes/sec) zpool destroy tank zpool create tank ad8 dd if=/dev/zero of=/tank/test.zero bs=3M count=1000 1000+0 records in 1000+0 records out 3145728000 bytes transferred in 39.550739 secs (79536517 bytes/sec) dd if=/dev/zero of=/tank/test.zero bs=64k count=100000 100000+0 records in 100000+0 records out 6553600000 bytes transferred in 90.810344 secs (72167990 bytes/sec) =-O ----- Alex V. Petrov
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