Re: slow zvol performance compared to files on the same pool

2009-01-04 Thread Pete French
> On 7.x (where ZFS is really quite broken for server use - don't waste > too much time on it) the ZVOL code did an "fsync" after every single > block write. Its a testament to your fast disks that you got as high as > 12mb/s. I don't know why your read speed was so bad, but you should try >

Re: slow zvol performance compared to files on the same pool

2009-01-04 Thread Freddie Cash
On Sat, Jan 3, 2009 at 7:02 PM, David Ehrmann wrote: > Andrew Snow wrote: >> >> On 7.x (where ZFS is really quite broken for server use - don't waste too >> much time on it) > > How exactly is it broken? I know there are some issues, but so serious > you'd say it's broken? It's not "broken" on 7

Re: slow zvol performance compared to files on the same pool

2009-01-03 Thread David Ehrmann
Andrew Snow wrote: On 7.x (where ZFS is really quite broken for server use - don't waste too much time on it) How exactly is it broken? I know there are some issues, but so serious you'd say it's broken? ___ freebsd-stable@freebsd.org mailing list h

Re: slow zvol performance compared to files on the same pool

2009-01-03 Thread Andrew Snow
Pete French wrote: I was experimenting with iscsi earlier, using both a flat file as the backing store and also a zvol. I noticed that the zvol was giving me dreadful performance - reading at about 20 meg/second and writing at about 12. the fklat file gives about 45 meg/second both ways. i thouh