Date: Wed, 4 Aug 2010 22:14:58 +0800 From: "Alex V. Petrov" <alexvpetrov@gmail.com> To: Andriy Gapon <avg@icyb.net.ua> Cc: freebsd-stable@freebsd.org Subject: Re: zpool - low speed write Message-ID: <201008042214.59264.alexvpetrov@gmail.com> In-Reply-To: <4C5960E6.7060702@icyb.net.ua> References: <201008042008.25679.alexvpetrov@gmail.com> <4C5960E6.7060702@icyb.net.ua>
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В сообщении от 4 августа 2010 20:45:26 вы написали: > on 04/08/2010 15:08 Alex V. Petrov said the following: > > Hi All! > > > > $ dd if=/dev/random of=/tank/test bs=3M count=1000 > > /dev/random is slow. On single disk (UFS) speed of write faster: $ dd if=/dev/random of=/home/alex/temp/test bs=3M count=1000 1000+0 records in 1000+0 records out 3145728000 bytes transferred in 75.778427 secs (41512184 bytes/sec) Result for /dev/zero: $ dd if=/dev/zero of=/tank/test bs=3M count=1000 1000+0 records in 1000+0 records out 3145728000 bytes transferred in 113.110421 secs (27811124 bytes/sec) In Krusader speed copying files from a single disk to an pool of about 8 MB/s Fragment of `systat -v 1` in proces copying: Disks ada0 ada1 ada2 ada3 ada4 KB/t 0,00 122 44,35 32,89 48,50 tps 0 54 56 53 54 MB/s 0,00 6,42 2,42 1,70 2,55 %busy 0 11 7 4 82 ----- Alex V. Petrov
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