Hi,
Well, I guess this was an easy one -- at least for you folks! I received
MANY replies and everyone agreed (see below). Many of you are frequent
responders; I am in awe of your time-management skills and of your
knowledge of Tru64, etc. I can't tell you how much I appreciate your help
on this and other questions! I have learned a lot from everyone. This is
a GREAT mailgroup! Here we go...
========= original questions ===========
For reasons of history and habit, we have several DEC/Compaq DUX/Tru64
machines that, for the most part, use UFS rather than AdvFS. The UFS
filesystems are extensively cross-mounted among all the machines via NFS.
The newer machines generally come with / and /usr (and /var) created as
AdvFS. I am considering a gradual migration to AdvFS: creating new
filesystems as AdvFS (but probably not converting existing ones to AdvFS
unless strongly compelled to do so). I have two rather naive questions...
1. From what I've read, it seems that it is OK to export an AdvFS fileset
from one machine and mount it via NFS onto another machine. Right?
Anything to watch-out for in doing this?
2. If a couple of AdvFS domains and filesets exist on a given volume
(using, for example, /dev/disk/dsk0a and dsk0g), is it OK to create UFS
filesystems on the unused partitions (dsk0d, e & f)? I realize that this
may not be the most best arrangement, and I probably won't do it if #1
above is OK.
(Also, if a swap partition exists on dsk0b, can I add another swap
partition using, for example, dsk0h? Again, not the best arrangement,
but....)
==================================
My thanks to...
Bruce Platt <bruce_at_ei3corp.com>
Serguei Patchkovskii <patchkov_at_ucalgary.ca>
"Degerness, Mandell ISTA:EX" <Mandell.Degerness_at_gems2.gov.bc.ca>
"Staab, Brian" <Brian.Staab_at_compaq.com>
sysadmin_at_astro.su.se
"Dr. Tom Blinn, 603-884-0646" <tpb_at_doctor.zk3.dec.com>
Ettore Aldrovandi ettore_at_sg1.hep.fsu.edu
"Frank Wortner" <frank_at_bondnet.com>
alan_at_nabeth.cxo.dec.com
Dr. Enrique A. Caponi ec_at_piantao.sp.TRW.com
sajan s <s_sajan_at_yahoo.com>
Peter.Stern_at_weizmann.ac.il
Joe Fletcher <joe_at_meng.ucl.ac.uk>
"Sheila Hollenbaugh" <shollen_at_cs.wright.edu>
Q1: Everyone agreed -- no problems between AdvFS & NFS. AdvFS ACLs may not
carryover to NFS depending on vendor. Alan (nabeth.cxo.dec.com) had some
rather specific comments:
"Another performance related thing to avoid is building
a multi-volume AdvFS domain, with the "volumes" on the
same disk. For some I/O loads, the AdvFS log becomes
a very busy part of the disk. Having to seek a long
distance to get to the log, will affect the performance.
But, ultimately, that's a general performance problem;
the more you spread the I/O load over the disk, the
longer the seek distances become."
Q2: Also, no problem mixing AdvFS & NFS as long as no partitions overlap.
Many people suggested that I reconsider this arrangement for various
reasons. It is actually a moot point since Q1 was a "yes", but it's nice
to know anyway...
The swap question: Again, no problem. Many people made some good
suggestions... Consolidate swap partitions rather that having two on one
disk -- especially if they are vastly different sizes. Or put the swap
areas on separate disks. Or convert the original small swap space to a UFS
/tmp filesystem.
Thanks again,
Peyton
University of Michigan, Radiology
voice: 734-647-0849
FAX: 734-764-8541
e-mail: bland_at_umich.edu
URL:
http://www.med.umich.edu/dipl/
Received on Tue Dec 12 2000 - 18:24:03 NZDT