Hello Eric, Monday, August 7, 2006, 5:53:38 PM, you wrote:
ES> Cool stuff, Robert. It'd be interesting to see some RAID-Z (single- and ES> double-parity) benchmarks as well, but understandably this takes time ES> ;-) I intend to test raid-z. Not sure there'll be enough time for raidz2. ES> The first thing to note is that the current Nevada bits have a number of ES> performance fixes not in S10u2, so there's going to be a natural bias ES> when comparing ZFS to ZFS between these systems. Yeah, I know. That's why I put UFS on HW config also to see if ZFS doesn't underperform on U2. ES> Second, you may be able to get more performance from the ZFS filesystem ES> on the HW lun by tweaking the max pending # of reqeusts. One thing ES> we've found is that ZFS currently has a hardcoded limit of how many ES> outstanding requests to send to the underlying vdev (35). This works ES> well for most single devices, but large arrays can actually handle more, ES> and we end up leaving some performance on the floor. Currently the only ES> way to tweak this variable is through 'mdb -kw'. Try something like: Well, strange - I did try with value of 1, 60 and 256. And basically I get the same results from varmail tests. -- Best regards, Robert mailto:[EMAIL PROTECTED] http://milek.blogspot.com _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
