https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=262685
Bug ID: 262685
Summary: periodic 223.backup-zfs saving ever changing
properties, unuseful daily e-mails
Product: Base System
Version: 12.3-RELEASE
Hardware: Any
OS: Any
Status: New
Severity: Affects Many People
Priority: ---
Component: misc
Assignee: [email protected]
Reporter: [email protected]
The script /etc/periodic/daily/223.backup-zfs should save informations about
zpool and zfs layout and some useful properties. These informations should be
useful for recreating the pool layout after some disaster (machine parseable?).
I am the author of the original version from the PR 86388 and this was my
intention.
There should not be any statistical information (compress ratio, space usage
etc.)
These commands were used for this in the original 223.backup-zfs
zpool list -vp
zfs list -p -H -o name,mountpoint
zfs get -H -p -t filesystem,volume all | grep -E -v
"available|compressratio|logicalreferenced|logicalused|refcompressratio|referenced|used|usedbychildren|usedbydataset|written"
zpool get -H -p all | grep -E -v
"capacity|dedupratio|free|allocated|fragmentation"
They were changed in committed version to simple
zpool list
zfs list
zfs get
zpool get
But this breaks some things. Current and previous backup files are compared and
differencies are being e-mailed. This committed version will see differences in
things like compress ratio, space usage and other things which should not be
included in the backed up informations.
Then this unuseful informations are being sent to the user just because there
is difference in disk space useage
Backup of ZFS information for all imported pools
33,34c33,34
< sys/usr 10.0M 12.3G 88K none
< sys/usr/home 8.88M 12.3G 1.48M /usr/home
---
> sys/usr 10.1M 12.3G 88K none
> sys/usr/home 8.89M 12.3G 1.48M /usr/home
42c42
< sys/var/tmp 3.38M 12.3G 148K /var/tmp
---
> sys/var/tmp 3.38M 12.3G 140K /var/tmp
84c84
< tank0/vol0/web 265M 9.80T 9.54M /vol0/web
---
> tank0/vol0/web 265M 9.80T 9.47M /vol0/web
Also I don't see dumping properties for snapshots much useful but it can be
painfully slow on systems with a lot of snapshots, that's why my original
version had zfs get -H -p -t filesystem,volume all.
I see this can be changed in /etc/periodic.conf with daily_backup_zfs_get_flags
but I think there should be more sane defaults.
I am using the original version from 2017 but now, after upgrading FreeBSD to
version with 223.backup-zfs shipped in the base I am seeing long list of
changes in each daily e-mail.
I really would like to talk to somebody who is in charge for periodic scripts
and find a way to make it better for all users. I can provide patches if we
agree on what and how should be done.
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