Re: [zfs-discuss] ZFS space usage

2009-11-19 Thread Duncan Bradey
Thanks Richard, I've set the refreservation down and this has "freed" up space, I'm now setting up a process to monitor and update the refreservation attribute on zfs volumes used so we can thin provision yet keep some storage (half the remaining volume size) available to ensure that these volu

Re: [zfs-discuss] ZFS space usage

2009-11-19 Thread Richard Elling
On Nov 18, 2009, at 8:54 PM, Duncan Bradey wrote: Richard, Thanks for this, this explains why I am seeing this. I am using snapshots as I am replicating the data to other servers (via zfs send/recieve) is there another way to prevent this behaviour and still use snapshots? Or do I need

Re: [zfs-discuss] ZFS space usage

2009-11-18 Thread Duncan Bradey
Richard, Thanks for this, this explains why I am seeing this. I am using snapshots as I am replicating the data to other servers (via zfs send/recieve) is there another way to prevent this behaviour and still use snapshots? Or do I need to create these volumes as thin provisioned to get aroun

Re: [zfs-discuss] ZFS space usage

2009-11-18 Thread Richard Elling
On Nov 18, 2009, at 7:28 PM, Duncan Bradey wrote: Guys, Forgive my ignorance on this but I am wondering how ZFS uses space when a volume is created with the -V parameter and then shared as an iSCSI lun. For example, I created 5 volumes 2 * 1TB in size and 3 * 2TB in size, but the space

[zfs-discuss] ZFS space usage

2009-11-18 Thread Duncan Bradey
Guys, Forgive my ignorance on this but I am wondering how ZFS uses space when a volume is created with the -V parameter and then shared as an iSCSI lun. For example, I created 5 volumes 2 * 1TB in size and 3 * 2TB in size, but the space usage appears to be in addition to this size specification