zpool - low speed write

[Alex V. Petrov]

В сообщении от 4 августа 2010 22:40:22 вы написали:
>  Try booting with the following on /boot/loader.conf:
> vfs.zfs.vdev.max_pending="10"
> vfs.zfs.txg.write_limit_override=268435456
> 
> And remove setting:
> vfs.zfs.cache_flush_disable=1
> 
> Then try a dd from /dev/zero.

OK.

dd if=/dev/zero of=/tank/test.zero bs=3M count=1000
1000+0 records in
1000+0 records out
3145728000 bytes transferred in 394.974934 secs (7964374 bytes/sec)

During execution dd:

zpool iostat -v 10 10
               capacity     operations    bandwidth
pool         used  avail   read  write   read  write
----------  -----  -----  -----  -----  -----  -----
tank        1,92T   819G      0     52  53,5K  4,09M
  ada4       601G   330G      0     18  20,2K  1,47M
  ada2       637G   291G      0     18  17,3K  1,45M
  ada3       730G   198G      0     16  15,9K  1,18M
----------  -----  -----  -----  -----  -----  -----

               capacity     operations    bandwidth
pool         used  avail   read  write   read  write
----------  -----  -----  -----  -----  -----  -----
tank        1,92T   821G     13    125  1,08M  9,22M
  ada4       600G   331G      4     43   390K  3,25M
  ada2       636G   292G      5     43   371K  3,32M
  ada3       729G   199G      3     38   345K  2,64M
----------  -----  -----  -----  -----  -----  -----

               capacity     operations    bandwidth
pool         used  avail   read  write   read  write
----------  -----  -----  -----  -----  -----  -----
tank        1,92T   821G      0    183      0  15,2M
  ada4       600G   331G      0     63      0  5,28M
  ada2       636G   292G      0     64      0  5,58M
  ada3       729G   199G      0     55      0  4,37M
----------  -----  -----  -----  -----  -----  -----

               capacity     operations    bandwidth
pool         used  avail   read  write   read  write
----------  -----  -----  -----  -----  -----  -----
tank        1,92T   821G      0    177      0  14,6M
  ada4       600G   331G      0     62      0  5,29M
  ada2       636G   292G      0     60      0  5,14M
  ada3       729G   199G      0     53      0  4,17M
----------  -----  -----  -----  -----  -----  -----

               capacity     operations    bandwidth
pool         used  avail   read  write   read  write
----------  -----  -----  -----  -----  -----  -----
tank        1,92T   821G      0    193      0  15,6M
  ada4       601G   330G      0     65      0  5,41M
  ada2       636G   292G      0     68      0  5,60M
  ada3       729G   199G      0     59      0  4,60M
----------  -----  -----  -----  -----  -----  -----

               capacity     operations    bandwidth
pool         used  avail   read  write   read  write
----------  -----  -----  -----  -----  -----  -----
tank        1,92T   821G      0    178      0  12,8M
  ada4       601G   330G      0     61      0  4,45M
  ada2       636G   292G      0     63      0  4,73M
  ada3       729G   199G      0     53      0  3,65M
----------  -----  -----  -----  -----  -----  -----

               capacity     operations    bandwidth
pool         used  avail   read  write   read  write
----------  -----  -----  -----  -----  -----  -----
tank        1,92T   821G      0    190      0  14,1M
  ada4       601G   330G      0     68      0  5,24M
  ada2       636G   292G      0     64      0  4,88M
  ada3       729G   199G      0     57      0  3,95M
----------  -----  -----  -----  -----  -----  -----

               capacity     operations    bandwidth
pool         used  avail   read  write   read  write
----------  -----  -----  -----  -----  -----  -----
tank        1,92T   821G      4    178   269K  14,4M
  ada4       601G   330G      1     64   122K  5,47M
  ada2       636G   292G      1     60  77,2K  4,86M
  ada3       729G   199G      0     53  70,3K  4,03M
----------  -----  -----  -----  -----  -----  -----

               capacity     operations    bandwidth
pool         used  avail   read  write   read  write
----------  -----  -----  -----  -----  -----  -----
tank        1,92T   820G      5    128   327K  7,26M
  ada4       601G   330G      1     39   128K  2,02M
  ada2       636G   292G      1     46   109K  2,95M
  ada3       730G   198G      1     41  90,5K  2,29M
----------  -----  -----  -----  -----  -----  -----

               capacity     operations    bandwidth
pool         used  avail   read  write   read  write
----------  -----  -----  -----  -----  -----  -----
tank        1,92T   820G      9    181   541K  10,3M
  ada4       601G   330G      3     65   181K  4,07M
  ada2       636G   292G      2     59   192K  3,44M
  ada3       730G   198G      2     56   168K  2,78M
----------  -----  -----  -----  -----  -----  -----


-----
Alex V. Petrov