Hi!
Recently my 5T hard drive broke. It contained among other things a
master PFS that was backed up to a remote host.
I replaced broken hard drive, formatted it and run hammer mirror-copy
from the remote pfs. After that I upgraded the freshly copied PFS to
master
and now I can't set up the backup process again. The command "hammer
mirror-stream" simply doesn't do anything.
Both my new master PFS and old backup seem to work OK and I can even
mirror-stream from them to other places. But I can't mirror-stream from
master to slave.
I checked sync-end-tid on both of them and noticed that for some reason
the TID of my new master is a bit behind the one on my slave.
So I guess I somehow a few changes from my backup were not commited to
my new harddrive. The problem is I already upgraded this PFS to master
and even made some changes on it (just for testing, I don't mind loosing
them).
I realize that I can easily delete the master PFS, re-mirror it again
from my backup and make sure it has the same sync-end-tid before
upgrading it to master, but I would like to avoid it because the PFS is
very large.
My question: is it possible to roll-back a PFS (master or slave) a few
transactions back?
I noticed that "hammer pfs-update" allows to simply change sync-end-tid,
but since I don't understand what it is made for I am in doubt.
Especially because the man page states "Manually modifying this field is
dangerous and can result in a broken mirror."
Is there a way to roll-back a PFS or I have to re-mirror it from my
backup again?
(I also now that I can do a local mirror-stream from my new master to
separate PFS, stop it right before the end and then finish mirroring
from my backup, but I it requires a lot of copying anyway, though local
is better than remote, which I would like to avoid.)
--
Aleksej Lebedev
- Restoring a PFS from a backup Aleksej Lebedev
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