Just to try this out, I created a 9g zpool and a 5g volume in that zpool. Then I used dd to write to every block of the volume.
Taking a snapshot of the volume at that point attempts to reserve an additional 5g, which fails. With 1g volumes we see it in action: bash-3.00# zpool create tank c0d1s0 bash-3.00# zfs list NAME USED AVAIL REFER MOUNTPOINT tank 89.5K 9.84G 1K /tank bash-3.00# zfs create -V 1g tank/vol bash-3.00# zfs list NAME USED AVAIL REFER MOUNTPOINT tank 1.00G 8.84G 18K /tank tank/vol 1G 9.84G 16K - bash-3.00# dd if=/dev/zero of=/dev/zvol/dsk/tank/vol bs=128k write: No such device or address 8193+0 records in 8193+0 records out bash-3.00# zfs list NAME USED AVAIL REFER MOUNTPOINT tank 1.00G 8.84G 18K /tank tank/vol 1G 8.87G 993M - bash-3.00# zfs snapshot tank/[EMAIL PROTECTED] bash-3.00# zfs list NAME USED AVAIL REFER MOUNTPOINT tank 2.00G 7.84G 18K /tank tank/vol 2.00G 8.84G 1.00G - tank/[EMAIL PROTECTED] 0 - 1.00G - bash-3.00# So that's probably what Paul is running into. On Thu, 13 Nov 2008, Matthew Ahrens wrote: > Are you sure that you don't have any refreservations? > > --matt > > Paul wrote: >> I apologize for lack of info regarding to previous post. >> >> # zpool list >> >> NAME SIZE USED AVAIL CAP HEALTH ALTROOT >> gwvm_zpool 3.35T 3.16T 190G 94% ONLINE - >> rpool 135G 27.5G 107G 20% ONLINE - >> ... >> >> # zfs list >> >> ... >> gwvm_zpool/gwpo19stby 100G 504M 18K >> /gwvm_zpool/gwpo19stby >> gwvm_zpool/[EMAIL PROTECTED] 0 - 18K - >> gwvm_zpool/gwpo19stby/po19stby-vdisk1 100G 34.6G 65.9G - >> ... >> >> Issue: >> >> run >> >> # zfs snapshot -r gwvm_zpool/[EMAIL PROTECTED] >> cannot create snapshot 'gwvm_zpool/gwpo19stby/[EMAIL PROTECTED]': out of >> space >> no snapshots were created >> >> >> # zfs snapshot wvm_zpool/gwpo19stby/[EMAIL PROTECTED] >> cannot create snapshot 'gwvm_zpool/gwpo19stby/[EMAIL PROTECTED]': out of >> space >> >> >> The gwvm_zpool pool still has 190 GB available. Snapshot does not consume >> the storage space. When I performed snapshot with different zvol size (1GB, >> 10GB), I have no problem with the "out of space" message. >> > > _______________________________________________ > zfs-discuss mailing list > zfs-discuss@opensolaris.org > http://mail.opensolaris.org/mailman/listinfo/zfs-discuss > Regards, markm _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
