ZFS quota
Posted on April 19, 2017 • 1 minutes • 212 words • Suggest Changes
ZFS is loaded with useful features, just a while ago I took a peak at setting quotes. Using just a few commands you limit the amount of storage a certain pool can take.
First let’s check if there is no quota set :
zfs get quota
This would result in something like :
# zfs get quota NAME PROPERTY VALUE SOURCE huginn quota none default huginn/dataset quota none default huginn/[email protected]_2017-04-01_00:00:02_monthly quota - - huginn/[email protected]_2017-04-10_00:00:01_daily quota - - [...] huginn/[email protected]_2017-04-19_14:00:01_hourly quota - - jbod1 quota none default jbod1/users quota none default jbod1/users/servers quota - -
As you see, no quota’s. Now let’s add one :
zfs set quota=5TB jbod1/users/server
The format : zfs set quota=$size $pool
Let’s check again :
[[email protected] HG00731]# zfs get -r quota jbod1/users/someuser NAME PROPERTY VALUE SOURCE jbod1/users/server quota 5T local jbod1/users/[email protected]_2017-04-01_00:00:02_daily quota - - jbod1/users/[email protected]_2017-04-02_00:00:01_daily quota - - jbod1/users/[email protected]_2017-04-03_00:00:01_daily quota - - jbod1/users/[email protected]_2017-04-03_13:00:01_hourly quota - - jbod1/users/[email protected]_2017-04-03_14:00:01_hourly quota - -
Simple enough; now some practical warnings :
- full is full; you can’t remove, edit or overwrite data once its 100% full. Even tricks like “echo > big_file” won’t work. You need to either increase or drop the quota before its possible
- You can’t decrease a quota … once its allowed 5TB only destroying it will release the limit.
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