>In my experimentation (using my own buffer program), it's the receive >side buffering you need. The size of the buffer needs to be large enough >to hold 5 seconds worth of data. How much data/second you get will >depend on which part of your system is the limiting factor. In my case, >with 7200 RPM drives not striped and a 1Gbit network, the limiting >factor is the drives, which can easily deliver 50MBytes/sec, so a buffer >size of 250MBytes works well. With striped disks or 10,000 or 15,000 RPM >disks, the 1Gbit network might become the limiting factor (at around >100MByte/sec).
The modern "Green Caviars" from Western Digital run at 5400rpm; yet they deliver 95MB/s from the outer tracks. For ufs "ufsdump | ufsrestore" I have found that I prefer the buffer on the receive side, but it should be much bigger. ufsrestore starts with creating all directories and that is SLOW. Casper _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
