zfs-auto-snapshot ls "File name too long"
David Christensen
dpchrist at holgerdanske.com
Sat Aug 24 19:42:12 UTC 2019
freebsd-questions:
I have:
2019-08-24 12:15:53 toor at soho ~
# freebsd-version ; uname -a
11.2-RELEASE-p13
FreeBSD soho.tracy.holgerdanske.com 11.2-RELEASE-p13 FreeBSD
11.2-RELEASE-p13 #0: Tue Aug 6 06:41:33 UTC 2019
root at amd64-builder.daemonology.net:/usr/obj/usr/src/sys/GENERIC amd64
I am using zfs-auto-snapshot (no man page?):
2019-08-24 12:29:28 toor at soho ~
# zfs-auto-snapshot
Usage: /usr/local/sbin/zfs-auto-snapshot [-dknpuv] <INTERVAL> <KEEP>
-d Show debug output.
-k Keep zero-sized snapshots.
-n Do a dry-run. Nothing is committed. Only show
what would be done.
-p Create snapshots in parallel.
-P pool Act only on the specified pool.
-u Use UTC for snapshots.
-v Show what is being done.
INTERVAL The interval to snapshot.
KEEP How many snapshots to keep.
I have set ZFS user properties on my file systems. For example:
2019-08-24 12:26:09 toor at soho ~
# zfs get -t filesystem all /jail | egrep 'auto-snap.+true'
tracy_p1/tracy_ds0/jail com.sun:auto-snapshot true
inherited from tracy_p1
I had the following crontab entry:
2 * * * * /usr/local/sbin/zfs-auto-snapshot hourly 25
Snapshots were being taken at two minutes after each hour.
ls(1) is able to see the snapshots with shorter path names:
2019-08-24 12:20:13 toor at soho ~
# ls /jail/.zfs/snapshot | grep hourly
zfs-auto-snap_hourly-2019-02-21-17h00
zfs-auto-snap_hourly-2019-02-21-18h00
zfs-auto-snap_hourly-2019-02-22-20h00
<snip>
But ls(1) is unable to access snapshots with longer path names:
2019-08-24 12:21:01 toor at soho ~
# ls /jail/samba/var/local/samba/dpchrist/.zfs/snapshot/*hour*
ls:
/jail/samba/var/local/samba/dpchrist/.zfs/snapshot/zfs-auto-snap_hourly-2019-08-21-01h02:
File name too long
ls:
/jail/samba/var/local/samba/dpchrist/.zfs/snapshot/zfs-auto-snap_hourly-2019-08-21-05h02:
File name too long
ls:
/jail/samba/var/local/samba/dpchrist/.zfs/snapshot/zfs-auto-snap_hourly-2019-08-21-15h02:
File name too long
<snip>
STFW I see:
https://lists.freebsd.org/pipermail/freebsd-fs/2010-March/007974.html
So, the problem is ZFS (?).
Searching for a FreeBSD bug report came up empty:
https://bugs.freebsd.org/bugzilla/buglist.cgi?quicksearch=zfs+snapshot+File+name+too+long
My current work-around is to shorten the INTERVAL:
2019-08-24 12:30:55 toor at soho ~
# crontab -l | grep 'h 25'
2 * * * * /usr/local/sbin/zfs-auto-snapshot h 25
2019-08-24 12:32:10 toor at soho ~
# ls /jail/samba/var/local/samba/dpchrist/.zfs/snapshot/ | grep h-
zfs-auto-snap_h-2019-08-23-13h02
zfs-auto-snap_h-2019-08-23-14h02
zfs-auto-snap_h-2019-08-23-22h02
zfs-auto-snap_h-2019-08-23-23h02
zfs-auto-snap_h-2019-08-24-00h02
zfs-auto-snap_h-2019-08-24-04h02
zfs-auto-snap_h-2019-08-24-12h02
Is there a solution that allows ZFS snapshots of longer paths?
David
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