hi all, currently having trouble with sustained write performance with my setup...
ms server 2003/ms iscsi initiator 2.08 w/intel e1000g nic directly connected to snv_101 w/ intel e1000g nic. basically, given enough time, the sustained write behavior is perfectly periodic. if i copy a large file to the iscsi target, iostat reports 10 seconds or so of -no- writes to disk, just small reads... then 2-3 seconds of disk-maxed writes, during which time windows reports the write performance dropping to zero (disk queues maxed). so iostat will report something like this for each of my zpool disks (with iostat -xtc 1) 1s: %b 0 2s: %b 0 3s: %b 0 4s: %b 0 5s: %b 0 6s: %b 0 7s: %b 0 8s: %b 0 9s: %b 0 10s: %b 0 11s: %b 100 12s: %b 100 13s: %b 100 14s: %b 0 15s: %b 0 it looks like solaris hangs out caching the writes and not actually committing them to disk... when the cache gets flushed, the iscsitgt (or whatever) just stops accepting writes. this is happening across controllers and zpools. also, a test copy of a 10gb file from one zpool to another (not iscsi) yielded similar iostat results: 10 seconds of big reads from the source zpool, 2-3 seconds of big writes to the target zpool (target zpool is 5x bigger than source zpool). anyone got any ideas? point me in the right direction? thanks, milosz -- This message posted from opensolaris.org _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
