22 марта 2014 г. 15:24:14 CET, Gabriele Bulfon <[email protected]> пишет: >Hi, >I have a situation where a customer running illumos under vmware, >created a raidz zpool, >composed of 3 vmware disks, for a total of 700GB available space. >Then it created a single volume of almost 700GB, shared as an iscsi >resource, used by another server. >When trying to snapshot the zpool, it says "out of space" in the volume >fs. >No way to create snapshots. >I thought that the volume had reserved the space, so I had no space for >snapshots. >So I added 3 vmdisks of 43GB each, then expanded the pool with a raidz >of the new three disks. >So now I have the pool with two raidz, for a total of almost 1.1TB. >Still, can't snapshot the volume....."out of space". >Besides the fact that this vmware situation is very strange and maybe >silly, >what may be the reason for this? >Thanks for any help >Gabriele. > > > >------------------------------------------- >illumos-discuss >Archives: https://www.listbox.com/member/archive/182180/=now >RSS Feed: >https://www.listbox.com/member/archive/rss/182180/22642773-76f3f1fc >Modify Your Subscription: >https://www.listbox.com/member/?&; >Powered by Listbox: http://www.listbox.com
Zvol snapshots by default reserve enough space to guarantee their ability to be fully overwritten. That is, reservation would increase roughly by 'used' upon every snapshot. And i think the first snapshot starts this, doubling the reserved space requirements for the zvol as soon as the snapshot is made. At least that's what i saw on some older versions of zfs. There are some attributes to disable such behaviour, but you may lose guarantees to fill up the live dataset of the zvol, if some other datasets (including its own snapshots) consume the available pool space. -- Typos courtesy of K-9 Mail on my Samsung Android ------------------------------------------- illumos-discuss Archives: https://www.listbox.com/member/archive/182180/=now RSS Feed: https://www.listbox.com/member/archive/rss/182180/21175430-2e6923be Modify Your Subscription: https://www.listbox.com/member/?member_id=21175430&id_secret=21175430-6a77cda4 Powered by Listbox: http://www.listbox.com
