[Gluster-users] snapshots questions

[Strahil]

Don't invest too much time.

With Stratis, I expect better reporting/warning to be available.
 Yet, that's only an expectation.

Best Regards,
Strahil NikolovOn Jun 27, 2019 13:02, Dmitry Filonov <filonov at hkl.hms.harvard.edu> wrote:
>
> Thank you, Strahil -
>  I was pointed to --mode=script option that works perfectly for me.
>
> As for snapshots - am spoiled with ZFS that has much better reporting and tools to work with snapshots. Will do some internal monitoring and checks around snapshots. Was hoping am just missing something.
>
> Thanks,
>
> Fil
>
>
> On Thu, Jun 27, 2019, 1:53 AM Strahil <hunter86_bg at yahoo.com> wrote:
>>
>> If it expects a single word like 'y' or 'yes' , then you can try:
>> echo 'yes' | gluster snapshot delete  $(/my/script/to/find/oldest/snapshot)
>>
>> Of course, you should put some logic in order to find the oldest snapshot, bit that won't be hard as date & time of creation should be in the name.
>>
>> About the situation with the LVM, it is expected that the user takes care of that, as thin LVs can be overcommitted.
>>
>> For example my arbiter has 20 GB thin LV pool and I have 4 20GB LVs inside that pool.
>> As long as I don't exhaust the pool's storage - I'm fine.
>>
>> You shouldb't expect that LVM will play the monitoring role here - either put some kind of monitoring, or create your own solution to monitor that fact.
>>
>> Best Regards,
>> Strahil Nikolov
>>
>> On Jun 26, 2019 15:41, Dmitry Filonov <filonov at hkl.hms.harvard.edu> wrote:
>>>
>>> Hi, 
>>>  am really new to gluster and have couple question that I hope will be really easy to answer. Just couldn't find anything on that myself. 
>>>
>>> I did set up replica 3 gluster over 3 nodes with 2TB SSD in each node. 
>>> To have snapshot functionality I have created thin pool of the size of VG (1.82TB) and then 1.75TB thin LVM inside on each of the bricks. 
>>> It worked just fine until I scheduled creating hourly and daily snapshots on that gluster volume. In less than 2 days my thin volume got full and crashed. 
>>> Not refused creating new snapshots, but just died as LVM couldn't perform any operations there anymore. 
>>> So my first question is how to prevent this from happening. I could create smaller thin LVM, but I still have no control how much space I would need for snapshots. I was hoping to see some warnings and errors while creeating snapshots, but not failed LVM/Gluster. 
>>>
>>> The second question is related but not that important. Is there a way to schedule snapshot removal in cron? gluster snapshot delete requires interactive confirmation and I don't see any flag to auto-confirm snapshot removal. 
>>>
>>> Thank you, 
>>>
>>> Fil
>>>
>>> --
>>> Dmitry Filonov
>>> Linux Administrator
>>> SBGrid Core | Harvard Medical School
>>> 250 Longwood Ave, SGM-114
>>> Boston, MA 02115
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