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Hi there, I need to migrate zfs data from a huge vdev to a smaller one, as only 5% of the first vdev is used. Many zfs items were created on the source vdev, organized as tree, subtrees, etc. zpool attach and detach won't help here as the target device is smaller than the source one. So, with Nevada build 90, I've tried the following and would like to get some feedback from you all (this a 'principle' test). Here is my 'very tiny' config : bash-3.2# zpool status master pool: master state: ONLINE scrub: none requested config: NAME STATE READ WRITE CKSUM master ONLINE 0 0 0 c0d0s5 ONLINE 0 0 0 c0d0s6 ONLINE 0 0 0 bash-3.2# zpool status target pool: target state: ONLINE scrub: none requested config: NAME STATE READ WRITE CKSUM target ONLINE 0 0 0 c0d0s3 ONLINE 0 0 0 c0d0s4 ONLINE 0 0 0 Zfs items were created with quotas and mountpoints : bash-3.2# zfs list NAME USED AVAIL REFER MOUNTPOINT master 16.6M 177M 18K /master master/vol1 16.4M 83.6M 1.40M /testvol1 master/vol1/undervol1-1 5.02M 15.0M 5.02M /testvol1/undervol1-1 master/vol1/undervol1-2 10.0M 20.0M 10.0M /testvol1/undervol1-2 target 141K 194M 18K /target First, I did create a recursive snap of all zfs items owned by the ''master'' pool : bash-3.2# zfs snapshot -r [EMAIL PROTECTED] bash-3.2# zfs list NAME USED AVAIL REFER MOUNTPOINT master 16.6M 177M 18K /master [EMAIL PROTECTED] 0 - 18K - master/vol1 16.4M 83.6M 1.40M /testvol1 master/[EMAIL PROTECTED] 0 - 1.40M - master/vol1/undervol1-1 5.02M 15.0M 5.02M /testvol1/undervol1-1 master/vol1/[EMAIL PROTECTED] 0 - 5.02M - master/vol1/undervol1-2 10.0M 20.0M 10.0M /testvol1/undervol1-2 master/vol1/[EMAIL PROTECTED] 0 - 10.0M - target 141K 194M 18K /target I did notice that while creating a clone from my snapshot, I loose my under-zfs items : bash-3.2# zfs clone master/[EMAIL PROTECTED] master/clone1 bash-3.2# zfs list NAME USED AVAIL REFER MOUNTPOINT master 16.8M 177M 18K /master [EMAIL PROTECTED] 17K - 18K - master/clone1 0 177M 1.40M /master/clone1 No recursive stuff here... So, I'll need to perform this, one by one (via a script aware of all zfs items properties). To migrate my data, I did choose to send my [EMAIL PROTECTED] to ''target'' pool, on the very same host. As the target pool will get all the properties from the source (receive with -d and -F options), the following is done first : bash-3.2# umount /testvol1/undervol1-1 bash-3.2# umount /testvol1/undervol1-2 bash-3.2# umount /testvol1 Let's start the "migration" : bash-3.2# zfs send -R [EMAIL PROTECTED]| zfs receive -dnv -F target would receive full stream of [EMAIL PROTECTED] into [EMAIL PROTECTED] would receive full stream of master/[EMAIL PROTECTED] into target/[EMAIL PROTECTED] would receive full stream of master/vol1/[EMAIL PROTECTED] into target/vol1/[EMAIL PROTECTED] would receive full stream of master/vol1/[EMAIL PROTECTED] into target/vol1/[EMAIL PROTECTED] Then, for real : bash-3.2# zfs send -R [EMAIL PROTECTED]| zfs receive -d -F target bash-3.2# zfs list NAME USED AVAIL REFER MOUNTPOINT master 16.8M 177M 18K /master [EMAIL PROTECTED] 17K - 18K - master/vol1 16.5M 83.5M 1.40M /testvol1 master/[EMAIL PROTECTED] 16K - 1.40M - master/vol1/undervol1-1 5.04M 15.0M 5.02M /testvol1/undervol1-1 master/vol1/[EMAIL PROTECTED] 16K - 5.02M - master/vol1/undervol1-2 10.0M 20.0M 10.0M /testvol1/undervol1-2 master/vol1/[EMAIL PROTECTED] 16K - 10.0M - target 16.6M 177M 18K /target [EMAIL PROTECTED] 0 - 18K - target/vol1 16.4M 83.6M 1.40M /testvol1 target/[EMAIL PROTECTED] 0 - 1.40M - target/vol1/undervol1-1 5.02M 15.0M 5.02M /testvol1/undervol1-1 target/vol1/[EMAIL PROTECTED] 0 - 5.02M - target/vol1/undervol1-2 10.0M 20.0M 10.0M /testvol1/undervol1-2 target/vol1/[EMAIL PROTECTED] 0 - 10.0M - At this point, I can't see, from zfs cli, which zfs items are mounted or not. Anyway, a simple df -h helps : bash-3.2# df -h (...) master 194M 18K 177M 1% /master target 194M 18K 177M 1% /target target/vol1 100M 1.4M 84M 2% /testvol1 target/vol1/undervol1-2 30M 10M 20M 34% /testvol1/undervol1-2 target/vol1/undervol1-1 20M 5.0M 15M 26% /testvol1/undervol1-1 Question #1: how to know which zfs volume is mounted (from zfs side) via the zfs list command, in this situation ? Is there a FLAG for this I should see ? Question #2 : As I'm here working on a single host, I wonder if there is a way to avoid auto-mount of target zfs items. An alternative which will make me happy is to be able to change my target rootdir on tly... The idea is to mount all these target stuff when possible...(when customer production could be stopped) By the way, I get all my data online, actually hosted by my target pool : bash-3.2# ls -lR /testvol1 /testvol1: total 2829 -rwxr-xr-x 1 root root 1337110 Jun 11 13:01 TrueCopy-rd10812.pdf drwxr-xr-x 2 root root 3 Jun 11 14:55 undervol1-1 drwxr-xr-x 2 root root 3 Jun 11 14:55 undervol1-2 /testvol1/undervol1-1: total 10245 -rw------T 1 root root 5242880 Jun 11 14:55 5m /testvol1/undervol1-2: total 20487 -rw------T 1 root root 10485760 Jun 11 14:55 10m Many thanx for your hints and feedback C. --
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