Re: large object write performance

>> First the database was on a partition where compression was enabled, I changed it to an uncompressed one to see if it makes a difference thinking maybe the cpu couldn't handle the load.
> It made little difference in my case.
>
> My regular gmirror partition seems faster:
> dd bs=8k count=25600 if=/dev/zero of=./test
> 25600+0 records in
> 25600+0 records out
> 209715200 bytes transferred in 1.513112 secs (138598612 bytes/sec)
>
> the zfs compressed partition also goes faster:
> dd bs=8k count=25600 if=/dev/zero of=./test
> 25600+0 records in
> 25600+0 records out
> 209715200 bytes transferred in 0.979065 secs (214199479 bytes/sec)
> but this one didn't really go that fast in my test (maybe 10%)

Please can you run iozone and look for low random write performance with small blocks? (4k)
http://www.slashroot.in/linux-file-system-read-write-performance-test

Also please can you CC to the list with your replies to my on-list emails?

Graeme Bell