Le 20 déc. 08 à 22:34, Dmitry Razguliaev a écrit :
> Hi, I faced with a similar problem, like Ross, but still have not
> found a solution. I have raidz out of 9 sata disks connected to
> internal and 2 external sata controllers. Bonnie++ gives me the
> following results:
> nexenta,8G,
> 104393,43,159637,30,57855,13,77677,38,56296,7,281.8,1,16,26450,99,+++
> ++,+++,29909,93,24232,99,+++++,+++,13912,99
> while running on a single disk it gives me the following:
> nexenta,8G,
> 54382,23,49141,8,25955,5,58696,27,60815,5,270.8,1,16,19793,76,+++++,+
> ++,32637,99,22958,99,+++++,+++,10490,99
> The performance difference of between those two seems to be too
> small. I checked zpool iostat -v during bonnie++ itelligent writing
> and it looks it, every time more or less like this:
>
Did you run :
zpool iostat -v 1
?
> capacity operations bandwidth
> pool used avail read write read write
> ---------- ----- ----- ----- ----- ----- -----
> iTank 7.20G 2.60T 12 13 1.52M 1.58M
> raidz1 7.20G 2.60T 12 13 1.52M 1.58M
> c8d0 - - 1 1 172K 203K
> c7d1 - - 1 1 170K 203K
> c6t0d0 - - 1 1 172K 203K
> c8d1 - - 1 1 173K 203K
> c9d0 - - 1 1 174K 203K
> c10d0 - - 1 1 174K 203K
> c6t1d0 - - 1 1 175K 203K
> c5t0d0s0 - - 1 1 176K 203K
> c5t1d0s0 - - 1 1 176K 203K
>
> As far as I understand it, less each vdev executes only 1 i/o in a
> time. time. however, on a single device zpool iostat -v gives me the
> following:
>
>
> capacity operations bandwidth
> pool used avail read write read write
> ---------- ----- ----- ----- ----- ----- -----
> rpool 5.47G 181G 3 3 441K 434K
> c7d0s0 5.47G 181G 3 3 441K 434K
> ---------- ----- ----- ----- ----- ----- -----
>
> In this case this device performs 3 i/o in a time, which gives it
> much higher bandwidth per unit.
>
> Is there any way to increase i/o counts for my iTank zpool?
> I'm running OS-11.2008 on MSI P45 Diamond with 4G of memory
>
> Best Regards, Dmitry
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