On Wed, 22 Apr 2009, Nicholas Lee wrote:
If we turn this around - with 32KB NFS blocks in order to get 90MB you need about 2900 iops or .35 ms path latency. Network latency (*) on 32KB is at least .28ms. So .07 ms is left for the sync to disk. I doubt this is possible with rotational disk - even with a RAID0 array. According to the numbers I have I'd say it is possible with a strip of eight X25-M SSD drives or maybe 4 STEC Zeus SSD drives.
I am using a RAID array with a non-volatile (battery backed) write cache.
Was this number with nfs+zfs or ufs? I thought zfs was more strict with NFS and did not allow the commit to memory NFS3+ version of sync NFS.
This is with nfs+zfs. Bob -- Bob Friesenhahn [email protected], http://www.simplesystems.org/users/bfriesen/ GraphicsMagick Maintainer, http://www.GraphicsMagick.org/ _______________________________________________ storage-discuss mailing list [email protected] http://mail.opensolaris.org/mailman/listinfo/storage-discuss
