Hi,
I've recently upgraded from BackupPC v3.3.1 to v4.2.1 on a CentOS 7
machine using hobbes1069's excellent COPR v4 package. While the
experience is fresh in my mind, I have some observations to share.
1) It has taken around 4 weeks for the v4 system to complete the first
round of backups - the great bulk of that time is spent in v3->v4
copying during the first v4 backup. Right at the end of some of these
first v4 backups, the backup is flagged as having failed. The host LOG
file says (for example):
2018-08-08 08:10:32 Got fatal error during xfer (total size is
466869877613 speedup is 23.88)
The XferLOG says:
Got fatal error during xfer (total size is 466869877613 speedup is
23.88)
Backup aborted by user signal
As far as I know, this is a bogus report and the backup was actually
fine. A subsequent backup starts from this Partial backup and completes
successfully, running (of course) much faster than the first "failed"
backup. My guess is that the failure is caused by a ClientTimeout alarm
signal 72000 seconds after the backup starts, which arrives during the
v3->v4 copy. The LOG file reports this:
2018-08-01 22:56:17 Aborting backup up after signal ALRM
Thankfully it doesn't abort - it continues with the entire
copy/backup/refcount/... process.
2) Backups which are still running or which have failed show up on the
Host Summary web page with a recent Last Backup (days) value. This
makes it look (to me) like the backup has completed successfully. I
often use Host Summary sorted on the Last Backup column to see if any
filesystems are lacking recent backups, and that doesn't work now
because failed and still-running backups appear to be safely completed.
I think this is a change from v3.
3) I noticed that when BackupPC_nightly was running
"BackupPC_refCountUpdate -m", the BackupPC status web page said "v3
cpool scan - cntUpdate nn/nn". This makes it look like the v3 cpool
scan is still running - I think the reported status is incorrect during
this phase of the nightly process.
Overall v4 is so much faster than v3 and just as brilliantly conceived
and implemented - huge thank-you to Craig and anyone else involved for a
fantastic piece of software.
Michael.
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