How much space require for snapshots?

hamsaeed · 03-18-2015, 01:45 AM

Hi all,
can you help me for:
how much snapshots consume in zfs?
I create pool , I want create a volume , I dont know, how much hold space for snapshot?
dont any way or formula exist for compute space required for snapshots?

thanks you,

TB0ne · 03-18-2015, 03:04 PM

Quote:

Originally Posted by hamsaeed

Hi all,
can you help me for:
how much snapshots consume in zfs? I create pool , I want create a volume , I dont know, how much hold space for snapshot? dont any way or formula exist for compute space required for snapshots?

Did you try looking at the ZFS documentation you could have easily found on Oracle's website??
http://docs.oracle.com/cd/E19253-01/...cxc/index.html

Pearlseattle · 03-18-2015, 05:18 PM

===nilfs propaganda===
What about using nilfs2?
You'll get a lot of snapshots (called "checkpoint"s in nilfs2-terminology) - on my PC I get one every ~30 seconds!
You can then convert any checkpoint into a permanent snapshot whenever you want.
The garbage collector will then take care of leaving enough free space around for some peaks and otherwise delete the old checkpoints whenever free space becomes scarce (snapshots untouched).
Ok, to be used only on SSDs - not sure what happens when used with a HDD.