Path: utzoo!utgpu!watserv1!watmath!att!att!linac!pacific.mps.ohio-state.edu!zaphod.mps.ohio-state.edu!rpi!crdgw1!uunet!mcsun!inria!ircam!mf
From: mf@ircam.fr (Michel Fingerhut)
Newsgroups: comp.unix.ultrix
Subject: Slow dump/restore of ra90s on DECsystem 5810 (Ultrix 4.0)?
Message-ID: <1990Nov2.165227.4282@ircam.ircam.fr>
Date: 2 Nov 90 16:52:27 GMT
Sender: mf@ircam.ircam.fr (Michel Fingerhut)
Organization: IRCAM, Paris (France)
Lines: 13

Having had disk problems on ra90s, we had one replaced.  So as to copy the
file systems from the old one to the new one, we ran a dump of each fs in
the old one piped into a restore on the corresponding fs on the new one.
This was run in single user mode, and single jobs: nothing done in parallel.

It took an incredible long time to perform: for a 500 Meg partition -- over
2.5 hours.

Does anyone have a clue as to why?  Disk performance, controler management of
accesses to different drives, pipe problem or what?

Thanks for any help,
Michael Fingerhut