Best practices/setup so pool doesn't fill up 100%?

[m3ki]

I heard that after 80% zpool starts acting wonky and at 100% you're screwed.

What is a dumb proof way of setting up pool so in case it does get full (logs etc..) you're still ok to recover or delete files.

Ex. Can I set a quota in freenas UI or something?

Thanks.

 

[nojohnny101]

I heard that after 80% zpool starts acting wonky and at 100% you're screwed.

correct. except I would modify the "you're screwed" part to about 90-95% capacity.

What is a dumb proof way of setting up pool so in case it does get full (logs etc..) you're still ok to recover or delete files.

Ex. Can I set a quota in freenas UI or something?

I mean most people on here I would say just keep an eye on things through the GUI. It is true though you can set quotas and that would be a good idea (they can be set at the dataset level) but then that wouldn't take into account snapshots if you have them turned on.

 

[SweetAndLow]

You will get an email at 80 and 90 percent full. You can create a dataset with a reservation and never use it. Also if it fills up to 100% you just need to free up some space. Usually deleting things doesn't work but you can echo '' > filename this will truncate that file and give you space back.

I try to keep my system around 50% full and I just add more drives when I get close to that amount.

Sent from my Nexus 5X using Tapatalk

 

[m3ki]

I am at about 50% out of 100TB.
I do use snapshots.

I was hoping for something very elegant. Like some setting in the ZFS.

I don't like the idea of some strange dataset that's never used, also that dataset is useless if I use snapshots?

 

[SweetAndLow]

I think when you configure a reservation it makes it so you always have that much space on disk including snapshots.

Sent from my Nexus 5X using Tapatalk

 

[m3ki]

I think when you configure a reservation it makes it so you always have that much space on disk including snapshots.

Sent from my Nexus 5X using Tapatalk

nojohnny101 mentioned that it doesn't is it true?

 

[Mirfster]

I usually set the Volume/Pool "Quota For This DataSet And All Children". Easy way is to take the "Available Space" and subtract 20%, then set it under the "Advanced" Options.

Example of a 5.4 TiB Volume (2 x 3TB Mirrors):

Some info per the Manual (Under "Table 8.1.4 ZFS Dataset Options"):

Quota for this dataset and all children

integer only available in “Advanced Mode”; a specified value applies to both this dataset and any child datasets

 

[SweetAndLow]

That was in reference to quotas I'm taking about reservations.

Sent from my Nexus 5X using Tapatalk

 

[nojohnny101]

@SweetAndLow

I think when you configure a reservation it makes it so you always have that much space on disk including snapshots.

Can you confirm this is true? I was under the impression that quotas wouldn't reserve space in the system but would simply set a limit for data within that dataset.

 

[snaptec]

I have a monitoring, that alerts me If any Server / vm have failures.
For home usage a raspi is suitable for this and a nice project.


Gesendet von iPhone mit Tapatalk

 

[Ericloewe]

I'd like to point out that if your logs get you to critical pool usage, you have serious problems, either from excessive logging or a pool that's already way too full.

 

[m3ki]

Well issue is not logs per say.

I have a second pool which is about 500Gig and auto downloading setup. So there is a very good chance that might overflow and MAX my pool. This is what I was trying to prevent not necessarily 100TB pool.