ZFS snapshot Folder Disappearing

[claudiu vasadi]

On Mon, Aug 27, 2012 at 11:08 PM, Tim Gustafson <tjg at soe.ucsc.edu> wrote:

> Hi,
>
> I have a FreeBSD 9.0-RELEASE box that's running ZFS with zpool version
> 28.  I can't recall if this pool was upgraded from an earlier zpool
> version, or if it was created natively as a zpool version 28; is there
> any way to check that?
>
> I use snapshots for nightly backups.  I went in today to test to see
> if the snapshots were working correctly, and I got the following:
>
> root at bsd-06: cd /tank/export/projects/www/.zfs/snapshot
> /tank/export/projects/www/.zfs/snapshot: Not a directory.
>
> I'm getting the same error when I try to cd into the snapshot folder
> on any of my filesystems that have snapshots.
>
> The zpool is healthy, reporting no errors, and was last scrubbed less
> than a month ago with no errors being reported.  The server had been
> up for 51 days.  This server does not currently have a cache drive
> installed, nor am I using de-dupe anywhere.
>
> Based on some Googling around that I did, I ran:
>
> zdb -d tank | grep %
>
> and came up empty-handed - no errors appear to be reported there.
>
> I do create and delete snapshots on a regular basis, and I saw some
> chatter that suggested that might be the culprit, but I don't know how
> else to check for that.
>
> I updated to 9.0-RELEASE-p4 and rebooted.  The machine did not shut
> down properly, so I had to power-cycle it.  Upon rebooting all the
> way, the snapshots came back, but I wonder if they'll disappear again
> after the next round of snapshot creation and removal?
>
> Before anyone asks: presently, it would be feasible to do a "zfs send"
> to back this system up, and then rebuild the pool an then do a "zfs
> receive" to restore it, but that will become problematic shortly.
> This server has 135TB of disks, and will probably be about half full
> some time during the next few months.  I do have a mirror server with
> another 135TB of disks that I could use for that sort of
> backup/restore procedure, but it will be located at the far end of a
> 1GB network connection shortly, living about 50 miles away in a remote
> data closet, so backing up and restoring that much data will become
> more or less impossible.
>
> --
>
> Tim Gustafson
> tjg at soe.ucsc.edu
> 831-459-5354
> Baskin Engineering, Room 313A
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Hi,
Did you try "zfs set snapdir=visible <pool/dataset>" ?

-- 
Best regards,
Claudiu Vasadi