Le 01/12/2012 ? 08:33:31-0700, Jan Owoc a ?crit Hi, Sorry, I'm very busy those past few days.
> >> > > >> > http://tldp.org/HOWTO/LVM-HOWTO/removeadisk.html > > The commands described on that page do not have direct equivalents in > zfs. There is currently no way to reduce the number of "top-level > vdevs" in a pool or to change the RAID level. OK. > >> > I have a zpool with 48 disks with 4 raidz2 (12 disk). Inside those 48 > >> > disk > >> > I've 36x 3T and 12 x 2T. > >> > Can I buy new 12x4 To disk put in the server, add in the zpool, ask zpool > >> > to migrate all data on those 12 old disk on the new and remove those old > >> > disk ? > > In your specific example this means that you have 4 * RAIDZ2 of 12 > disks each. Zfs doesn't allow you to reduce that there are 4. Zfs > doesn't allow you to change any of them from RAIDZ2 to any other > configuration (eg RAIDZ). Zfs doesn't allow you to change the fact > that you have 12 disks in a vdev. OK thanks. > > If you don't have a full set of new disks on a new system, or enough > room on backup tapes to do a backup-restore, there are only two ways > for to add capacity to the pool: > 1) add a 5th top-level vdev (eg. another set of 12 disks) That's not a problem. > 2) replace the disks with larger ones one-by-one, waiting for a > resilver in between This is the point I don't see how to do it. I've 48 disk actually from /dev/da0 -> /dev/da47 (I'm under FreeBSD 9.0) lets say 3To. I've 4 raidz2 the first from /dev/da0 -> /dev/da11 etc.. So I add physically a new enclosure with new 12 disks for example 4To disk. I'm going to have new /dev/da48 --> /dev/da59. Say I want remove /dev/da0 -> /dev/da11. First I pull out the /dev/da0. The first raidz2 going to be in «degraded state». So I going to tell the pool the new disk is /dev/da48. repeat this_process until /dev/da11 replace by /dev/da59. But at the end how many space I'm going to use on those /dev/da48 --> /dev/da51. Am I going to have 3To or 4To ? Because each time before complete ZFS going to use only 3 To how at the end he going to magically use 4To ? Second question, when I'm going to pull out the first enclosure meaning the old /dev/da0 --> /dev/da11 and reboot the server the kernel going to give new number of those disk meaning old /dev/da12 --> /dev/da0 old /dev/da13 --> /dev/da1 etc... old /dev/da59 --> /dev/da47 how zfs going to manage that ? > > When I would like to change the disk, I also would like change the disk > > enclosure, I don't want to use the old one. > > You didn't give much detail about the enclosure (how it's connected, > how many disk bays it has, how it's used etc.), but are you able to > power off the system and transfer the all the disks at once? Server : Dell PowerEdge 610 4 x enclosure : MD1200 with 12 disk of 3To Connection : SAS SAS Card : LSI enclosures are chained : server --> MD1200.1 --> MD1200.2 --> MD1200.3 --> MD1200.4 > > > > And what happen if I have 24, 36 disks to change ? It's take mounth to do > > that. > > Those are the current limitations of zfs. Yes, with 12x2TB of data to > copy it could take about a month. OK. > > If you are feeling particularly risky and have backups elsewhere, you > could swap two drives at once, but then you lose all your data if one > of the remaining 10 drives in the vdev failed. OK. Thanks for the help Regards. JAS -- Albert SHIH DIO bâtiment 15 Observatoire de Paris 5 Place Jules Janssen 92195 Meudon Cedex Téléphone : 01 45 07 76 26/06 86 69 95 71 xmpp: j...@obspm.fr Heure local/Local time: jeu 6 déc 2012 09:20:55 CET _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
