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:
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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