Re: [cobalt-users] RaQ3/4 simultaneous file transfers (uploads)

[Jeff Lasman <jblists@xxxxxxxxxxxxx>]

cbtrussell wrote:

> The question: how can I know when I'm reaching the capacity of the RaQ to
> receive simultaneous uploads? I've got to think that some number of RaQ's
> running full tilt at 4am will eventually saturate the capacity of the drive
> to write all that data...anyone have any thoughts how to tell for sure?

We do almost exactly the same.  I don't worry about saturating the
server and so far I've seen no evidence of it.  However, we don't do it
at 4am, that's when the system's already busy doing it's cron.daily
jobs.  We backup the systems beginning at 1 am, and we start transfers
at 2 am.  And we upload one system at a time.

It's been a long time since I looked at linux internals, but I _believe_
that the disk write mechanism does "elevator" caching... that is it
writes first to memory, then to the right location on the drive when the
head reaches it.  At least I don't hear head thrashing when doing
multiple disk writes to a local system.

Jeff
-- 
-- 
Jeff Lasman, nobaloney.net, P. O. Box 52672, Riverside, CA  92517 US
Internet & Unix/Linux/Sun/Cobalt Consulting +1 909 778-9980
Our jblists address used on lists is for list email only
To contact us offlist: "http://www.nobaloney.net/contactus.html";