On Mon, 25 Jun 2007, Pawel Jakub Dawidek wrote: PJD> On Mon, Jun 25, 2007 at 11:53:43AM +0400, Dmitry Morozovsky wrote: PJD> > Dear colleagues, PJD> > PJD> > I'm playing with ZFS thinking about future storage server PJD> > I have two questions about it (currently; a least ;-) PJD> > PJD> > 1. How can one determine which portion of a provider zpool uses? It seems PJD> > logical for me if `zpool status -v' would display this info. PJD> PJD> I'm sorry, but I don't understand the question. If you use only one PJD> partition of a disk, zpool status will show you which partition it is. PJD> (but I don't think this was your question) I was not clear enough. In my experiments I used disks of different sizes, and got strange (to me) resulting sizes, such as: marck_at_woozlie:~# diskinfo ad{6,8,10,12,14} ad6 512 80026361856 156301488 155061 16 63 ad8 512 80026361856 156301488 155061 16 63 ad10 512 400088457216 781422768 775221 16 63 ad12 512 250059350016 488397168 484521 16 63 ad14 512 320072933376 625142448 620181 16 63 marck_at_woozlie:~# zpool create tank raidz ad6 ad8 ad12 marck_at_woozlie:~# zpool list NAME SIZE USED AVAIL CAP HEALTH ALTROOT tank 222G 189K 222G 0% ONLINE - marck_at_woozlie:~# zpool status pool: tank state: ONLINE scrub: none requested config: NAME STATE READ WRITE CKSUM tank ONLINE 0 0 0 raidz1 ONLINE 0 0 0 ad6 ONLINE 0 0 0 ad8 ONLINE 0 0 0 ad12 ONLINE 0 0 0 errors: No known data errors marck_at_woozlie:~# zfs list NAME USED AVAIL REFER MOUNTPOINT tank 120K 146G 24.0K /tank why zpool in 222G? zfs seems to have more reasonable size of 146G (sum of 2*80G disks). Next (replacing first 80G to 320G): marck_at_woozlie:~# zpool replace tank ad6 ad14 [wait] marck_at_woozlie:~# zpool status pool: tank state: ONLINE scrub: resilver completed with 0 errors on Mon Jun 25 19:52:09 2007 config: NAME STATE READ WRITE CKSUM tank ONLINE 0 0 0 raidz1 ONLINE 0 0 0 ad14 ONLINE 0 0 0 ad8 ONLINE 0 0 0 ad12 ONLINE 0 0 0 errors: No known data errors marck_at_woozlie:~# zpool list NAME SIZE USED AVAIL CAP HEALTH ALTROOT tank 222G 363K 222G 0% ONLINE - marck_at_woozlie:~# zfs list NAME USED AVAIL REFER MOUNTPOINT tank 120K 146G 24.0K /tank Still the same sizes... The last component (80G -> 400G): marck_at_woozlie:~# zpool replace tank ad8 ad10 marck_at_woozlie:~# zpool status pool: tank state: ONLINE scrub: resilver completed with 0 errors on Mon Jun 25 19:54:42 2007 config: NAME STATE READ WRITE CKSUM tank ONLINE 0 0 0 raidz1 ONLINE 0 0 0 ad14 ONLINE 0 0 0 ad10 ONLINE 0 0 0 ad12 ONLINE 0 0 0 errors: No known data errors marck_at_woozlie:~# zpool list NAME SIZE USED AVAIL CAP HEALTH ALTROOT tank 222G 354K 222G 0% ONLINE - marck_at_woozlie:~# zfs list NAME USED AVAIL REFER MOUNTPOINT tank 120K 146G 24.0K /tank Still the same. [final is at the end] PJD> PJD> > 2. It is also possible to expand the array by iteratively swapping each drive PJD> > in the array with a bigger drive and waiting for ZFS to heal itself - the heal PJD> > time will depend on amount of store information, not the disk size. PJD> > [ http://en.wikipedia.org/wiki/ZFS#Limitations ] PJD> > PJD> > My experiments does not show that zpool size increases after set of PJD> > `zpool replace'. Where did I went wrong? PJD> PJD> Works here after zpool export/zpool import. Well, will check this. However, this means that pool size increasing requires pool stopping (downtime required). Still much better than backup/restore or even copying multi-terabyte fs... In my case, though, numbers are still strange: marck_at_woozlie:~# zpool export tank marck_at_woozlie:~# zpool list no pools available marck_at_woozlie:~# zpool import pool: tank id: 5628286796211617744 state: ONLINE action: The pool can be imported using its name or numeric identifier. config: tank ONLINE raidz1 ONLINE ad14 ONLINE ad10 ONLINE ad12 ONLINE marck_at_woozlie:~# zpool import tank marck_at_woozlie:~# zpool status pool: tank state: ONLINE scrub: none requested config: NAME STATE READ WRITE CKSUM tank ONLINE 0 0 0 raidz1 ONLINE 0 0 0 ad14 ONLINE 0 0 0 ad10 ONLINE 0 0 0 ad12 ONLINE 0 0 0 errors: No known data errors marck_at_woozlie:~# zpool list NAME SIZE USED AVAIL CAP HEALTH ALTROOT tank 698G 207K 698G 0% ONLINE - marck_at_woozlie:~# zfs list NAME USED AVAIL REFER MOUNTPOINT tank 128K 458G 24.0K /tank Strange: 458G or 698G? 320+250 does not look similar to either number.... Thanks! Sincerely, D.Marck [DM5020, MCK-RIPE, DM3-RIPN] ------------------------------------------------------------------------ *** Dmitry Morozovsky --- D.Marck --- Wild Woozle --- marck_at_rinet.ru *** ------------------------------------------------------------------------Received on Mon Jun 25 2007 - 14:00:07 UTC
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