[OpenAFS] OpenAFS and Raid

[Derek Atkins]

Hartmut,

How do you prevent the /afs/mpg.de/user/foo from accessing the
readonly mountpoint?  Do you specifically mount all user.foo
volumes -rw?

-derek

Hartmut Reuter <reuter@rzg.mpg.de> writes:

> Petros Triantafyllidis schrieb:
> > 
> > Hi all,
> >   We are planning to install OpenAFS 1.2.2a on a new server running RH
> > 7.1, kernel 2.4.16smp. After the testing period this machine will be
> > the second server of a primary one which runs Solaris 2.6 and Transarc
> > AFS 3.6.
> > 
> > The thought is to implement software RAID on the Linux box. The question
> > is whether raid-5 can co-live with AFS. What are the possible pitfalls and
> > how should it be done in order we obtain the maximum of performance
> > (assuming redundancy is a must)?
> 
> We are running a machine with SuSE 7.3 (kernel 2.4.10) with 2 RAID5s,
> LVM and a huge reiserfs with 900 GB on top of this. Reading and writing
> performance seems to be ok (both ~ 36 MB/s). The only problem I have is
> that the RAID seems not to detect a bad disk by itself. When a disk dies
> we get a lot of SCSI-timeout messages in /var/log/messages, but it
> doesn't understand that the disk is dead. Worse: we have to reboot after
> a "raidsetfaulty" for the disk in order to get him to rebuild the RAID.
> We use this partition for readonly-volumes of the user's
> home-directories. I have written a "vos convert" command (MR-AFS) to
> convert a RO-volume to a RW-volume. This allows to come up after the
> loss of a partitioon much faster than if you had to restore the volumes
> from tape. So we do each night a "vos release" instead of a "vos
> backupsys".
> 
> Hartmut
> 
> 
> > 
> > Thanks a lot in advance,
> > Petros
> > 
> > --
> > Dr. TRIANTAFYLLIDIS PETROS         E-MAIL: trian@itc.auth.gr
> > ^^^^^^^^^^^^^^^^^^^^^^^^^^         http://afs.itc.auth.gr/~trian
> > AFS Technical Support Team
> > Aristotle University - Information Technology Center (KYTP)
> > POBox 888,54006 Thessaloniki-GREECE-TEL:+30-31-998444,FAX:998302
> > 
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> 
> -- 
> -----------------------------------------------------------------
> Hartmut Reuter                           e-mail reuter@rzg.mpg.de
> 					   phone +49-89-3299-1328
> RZG (Rechenzentrum Garching)               fax   +49-89-3299-1301 
> Computing Center of the Max-Planck-Gesellschaft (MPG) and the
> Institut fuer Plasmaphysik (IPP)
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-- 
       Derek Atkins, SB '93 MIT EE, SM '95 MIT Media Laboratory
       Member, MIT Student Information Processing Board  (SIPB)
       URL: http://web.mit.edu/warlord/    PP-ASEL-IA     N1NWH
       warlord@MIT.EDU                        PGP key available