Since a couple of weeks, we noticed that our backups are taking longer than
ever. We've checked the uerf listing for disk or tape errors and found none
during the backup. We also checked the console and syslog files and found
nothing unusual.
We pinpointed the problem to one particular fileset which contains oracle
datafiles. The number of files in that fileset has not changed, there are
not many files but they are big.
There is 4.6 Gigs of data in the problematic fileset, it takes 2 hours to
complete. This fileset is on a file domain constitued of two disks. Some of
the datafiles are stipped accross the twho disks by way of the "stripe"
advfs utility. We don't thinks that is a problem because the files have
been set up in this way for a long time and the backup problem started to
occur only recently. The backup goes well (I mean at a normal speed) for
the first 50% of the fileset.
A similar 4 gig fileset (on a single disk) takes 3/4 of an hour to complete
in comparison.
We backup on a TZ87 directly connected to the sever via a KZPAA and a BA356
shelf. That shelf is splitted in two, and the other part of the shelf
contains a TZ88 that is used to backup another server. The shelf being
splitted in two, we don't think there could be an I/O problem there (Is
this true ?)
We are backuping a clone but oracle is shut down during the backups. All
our data is on a shared SCSI bus behind HSZ40's. We are not backing up the
two servers at the same time.
SRVR1 BA356-------------------
KZPAA---------------0 | TZ87 | TZ88 |P|P|
| | | |W|W|
KZPAA---------------0 | | |R|R|
SRVR2 |-----------------------
Any help, guidelines, etc... to pinpoint the exact problem would be greatly
appreciated.
TIA !
-------------------------------------------------------------------
Guy E Dallaire, SysAdmin, DBA
Le Directeur General des Elections du Quebec, QC, Canada
Phone: (418) 646-8618
Fax: (418) 644-9624
** "Honni soit qui disco pense"
-------------------------------------------------------------------
Received on Thu Jun 26 1997 - 15:47:31 NZST