On Fri, Nov 14, 2008 at 10:04 AM, Joerg Schilling <[EMAIL PROTECTED]> wrote: > Andrew Gabriel <[EMAIL PROTECTED]> wrote: > >> Andrew Gabriel wrote: >> > Interesting idea, but for 7200 RPM disks (and a 1Gb ethernet link), I >> > need a 250GB buffer (enough to buffer 4-5 seconds worth of data). That's >> > many orders of magnitude bigger than SO_RCVBUF can go. >> >> No -- that's wrong -- should read 250MB buffer! >> Still some orders of magnitude bigger than SO_RCVBUF can go. > > It's affordable e.g. on a X4540 with 64 GB of RAM. > > ZFS started with constraints that could not be made true in 2001. > > On my first Sun at home (a Sun 2/50 with 1 MB of RAM) in 1986, I could > set the socket buffer size to 63 kB. 63kB : 1 MB is the same ratio > as 256 MB : 4 GB. > > BTW: a lot of numbers in Solaris did not grow since a long time and > thus create problems now. Just think about the maxphys values.... > 63 kB on x86 does not even allow to write a single BluRay disk sector > with a single transfer. > > Jörg > > -- > EMail:[EMAIL PROTECTED] (home) Jörg Schilling D-13353 Berlin > [EMAIL PROTECTED] (uni) > [EMAIL PROTECTED] (work) Blog: http://schily.blogspot.com/ > URL: http://cdrecord.berlios.de/private/ ftp://ftp.berlios.de/pub/schily > _______________________________________________ > zfs-discuss mailing list > zfs-discuss@opensolaris.org > http://mail.opensolaris.org/mailman/listinfo/zfs-discuss >
I'd like to see Sun's position on the speed at which large file systems perform ZFS send/receive. I expect my X4540's to nearly fill 48TB (or more considering compression), and taking 24 hours to transfer 100GB is, well, I could do better on an ISDN line from 1995. -- Brent Jones [EMAIL PROTECTED] _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
