Ahmed, > The setup is not there anymore, however, I will share as much details > as I have documented. Could you please post the commands you have used > and any differences you think might be important. Did you ever test > with 2008.11 ? instead of sxce ?
Specific to the following: >>> While we should be getting minimal performance hit (hopefully), we >>> got >>> a big performance hit, disk throughput was reduced to almost 10% of >>> the normal rate. It looks like I need to test on OpenSoalris 2008.11, not Solaris Express CE (b105), since this version does not have access to a version of 'dd' with a oflag=<option> setting. # dd if=/dev/zero of=/dev/zvol/rdsk/gold/xxVolNamexx oflag=dsync bs=256M count=10 dd: bad argument: "oflag=dsync" Using a setting of 'oflag=dsync' will have performance implications. Also there is an issue with an I/O of size bs=256M. SNDR's internal architecture has a I/O unit chunk size of one bit in 32KB". Therefore when doing an I/O of 256MB, this results in the need to set 8192 bits, 1024 bytes, or 1KB of data with 0xFF. Although testing with an /O size of 256MB is interesting, typical I/O tests are more like the following: http://www.opensolaris.org/os/community/performance/filebench/quick_start/ - Jim _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
