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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=D0=92 =D1=81=D0=BE=D0=BE=D0=B1=D1=89=D0=B5=D0=BD=D0=B8=D0=B8 =D0=BE=D1=82 = 4 =D0=B0=D0=B2=D0=B3=D1=83=D1=81=D1=82=D0=B0 2010 20:45:26 =D0=B2=D1=8B =D0= =BD=D0=B0=D0=BF=D0=B8=D1=81=D0=B0=D0=BB=D0=B8: > on 04/08/2010 15:08 Alex V. Petrov said the following: > > Hi All! > >=20 > > $ dd if=3D/dev/random of=3D/tank/test bs=3D3M count=3D1000 >=20 > /dev/random is slow. On single disk (UFS) speed of write faster: $ dd if=3D/dev/random of=3D/home/alex/temp/test bs=3D3M count=3D1000 1000+0 records in 1000+0 records out 3145728000 bytes transferred in 75.778427 secs (41512184 bytes/sec) Result for /dev/zero: $ dd if=3D/dev/zero of=3D/tank/test bs=3D3M count=3D1000 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 =46ragment 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 =2D---- Alex V. Petrov
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