> Mark J Musante wrote: > > On Tue, 30 Jun 2009, John Hoogerdijk wrote: > > > >> i've setup a RAIDZ2 pool with 5 SATA drives and > added a 32GB SSD log > >> device. to see how well it works, i ran bonnie++, > but never saw any > >> io's on the log device (using iostat -nxce) . > pool status is good - > > no issues or errors. any ideas? > > > > Try using direct i/o (the -D flag) in bonnie++. > You'll need at least > version 1.03e. > Or you could export the filesystem via NFS and run > any file creation/write > workload on an NFS client; that should generate a > large amount of log > activity thanks to the synchronous writes that the > NFS server must issue > to honour its obligations to the NFS client. > > -- > jason.ozol...@anu.edu.au ANU Supercomputer > Facility > Leonard Huxley Bldg > 56, Mills Road > Ph: +61 2 6125 5449 Australian National > University > Fax: +61 2 6125 8199 Canberra, ACT, 0200, > Australia > _______________________________________________ > zfs-discuss mailing list > zfs-discuss@opensolaris.org > http://mail.opensolaris.org/mailman/listinfo/zfs-discu > ss
nfs works, but i'll need a faster network ... i also compiled bonnie++ 1.03e with O_SYNC instead of O_DIRECT - there must be more too it as there is no activity on the SSD. just out of curiosity, why would asynch writes also use the SDD? Wouldn't that help to reduce memory pressure? It's not difficult to stall applications whilst do large whacks of IO like coping large iso images and perhaps the SSD could help to reduce the memory pressure. I'm testing on an 8gb box with a RAID2Z pool consisting of 5 sata disks, and although I'm getting pretty good throughput, it does tend to take over the box. jmh -- This message posted from opensolaris.org _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
