fssnap on a Read-Only mounted volume?
Hello,
Is it possible to create a snapshot of a volume that is mounted read only ?
My guess is that it isn't...
Here is the scenario.
I have a mail server who's primary /mail parition is a volume on our new iSCSI SAN.
I have a backup server who mounts the same SAN volume read only.
I want to let the backup server backup that /mail volume to another volume, or to tape however...
In the past, when I attempt to perform a regular ufsdump w/o any fssnap I often run into errors and the dump is inconsistent.
DUMP: bread: dev_seek error: Error 0
DUMP: Warning - block 1922882290 is beyond the end of `/dev/md/rdsk/d20'
I'm finding this to still be the case, even though the volume is on the SAN and is mounted read only.
Are those errors indicitative of a major problem or are they simply due to the fact that the volume is actively being written to and read from?
From the mail server, when I run ufsdump after running fssnap on the /mail volume, I don't see these errors, however the load on the mail server severely increases to the point where users begin to experience problems and slowdowns.
From the backup server, if I can fssnap that read-only /mail SAN /volume then perhaps I can get reliable backups?
Any suggestions would be appreciated.
Thanks,
--Raf
