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
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