I have created my own solution for this in the form of a shell script that
can create, replicate and rotate ZFS snapshots, suitable for use as a
cronjob. . I'm using it on Solaris (1[01]) and SmartOS as well although in
test environments only so far. I can share it, if You want me to, it might
prove helpful until someone comes up with a better one.
On 14 October 2015 12:43:52 pm "Jeb Winders" <[email protected]> wrote:
Agreed. Snapshots would have been an easy way to mitigate this but
implementing some auto snapshoting was one of the things on my todo list
that I embarrassingly never got around to doing. I do have one snapshot
from 2012 which has a lot in it so there is some recoverability.
Another funny part of this is that I was actually pretty good about doing
scrubs because I was always worried about the dreaded bit rot. But I
obviously did not take enough precautions against user error.
On Tue, Oct 13, 2015 at 10:59 PM, Michael Loftis <[email protected]> wrote:
A snapshot created before you started down this path would save your butt
here but beyond that I dunno...snapshots are cheap to the point of being
free with zfs so if you're not routinely snapshot ting everything hopefully
you'll start now.
On Tuesday, October 13, 2015, Jeb Winders <[email protected]> wrote:
Hello All,
First let me say that I greatly appreciate the work the community and
joyent have done on smartos. I am a big fan.
I know that my subject may seem provocative and I don't really mean it
that way, but on the other hand my files seem to be gone so maybe a smidge
of provocation is in order.
I do things that I probably should not like running the 2012Q2 release
since, well second quarter 2012.
When I started using smartos I had big plans to do all the zones stuff I
used to do on sol10 and opensolaris but one thing led to another and I
ended up mostly just running a zfs fs in the global zone as a place to dump
files until I made time to really get into it.
Well this past weekend the time finally came. After much investigation
and trial and error, I figured out that I had goobered up the old
smartos64plus zones I had made previously. Instead of trying to fix them I
went ahead and downloaded the latest usb image so I could get with the
modern age, be on the cutting edge, right side of history, all that stuff.
While I was waiting for things to 'dd' I rearranged some of the files and
dirs in my global zone zfs fs to kill time and then got to rebooting.
I then ran into the whole 'zones/dump' pool degraded issue but I
eventually find the guy who documented destroying and remaking the dump zfs
and things were undegraded again.
I made a working zone , got some stuff from pkgin, everything was going
swimmingly.
I mention all of the above to illustrate that smartos and I had a big
weekend.
Then I went to retrieve some files from my old global zone zfs filesystem
and all but two of the directories there were gone. Specifically
everything but the dirs I had been rearranging were gone.
10 points to whomever has already figured out what happened
At first I thought there was some kind of zpool something or other
happening cause I had just gotten over that whole 'degraded' scare the day
before. But zpool stuff doesn't usually leave some files intact and
visible and the fs mounted.
Here is a hint -- back in 2012 when I made this fs to dump files into I
obviously could not call it zones/dump because that was already taken. so
the next best thing I could think of that was not in use already was ...
wait for it ... zones/archive
5 points if you get it now.
For those of you still reading, evidently zones/archive is an actual
thing now and there is a handy cron job in the root crontab to find
everything in there which has not been touched in 7 days and 'rm' it.
so my dir full of linux iso's avoided certain doom, for now. but
everything else got 'rm'd
I realize this is an edge case and I shouldn't be putting stuff in the
global zone in the first place but if anyone has any advice for undeleting
files from zfs I would greatly appreciate it.
I wanted to learn more hardcore OS and filesystem stuff so I guess I get
my wish :)
Another question -- should I rename my zfs fs zones/archive to something
else or would that make it harder to recover stuff ?
or am I just deluding myself to think there will be any recovery ?
Thanks for any help you can render. In the mean time I will make a shell
script to touch the dirs in zones/archive everyday.
And let my story serve as a caution to any wayward soul who would make a
filesystem in the global zone.
-jeb
--
"Genius might be described as a supreme capacity for getting its possessors
into trouble of all kinds."
-- Samuel Butler
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