Re: [zfs-discuss] Adding mirrors to an existing zfs-pool]
On Thu, 28 Jul 2011, David Dyer-Bennet wrote: I'm still impressed by the ability to attach and detach arbitrary numbers of disks to mirrors. It makes upgrading mirrored disks very very safe, Zfs mirrors are super-cool. They are really flexible and recover quickly. Bob -- Bob Friesenhahn bfrie...@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/ GraphicsMagick Maintainer,http://www.GraphicsMagick.org/ ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
Re: [zfs-discuss] Adding mirrors to an existing zfs-pool]
On Tue, July 26, 2011 09:55, Cindy Swearingen wrote: > > Subject: Re: [zfs-discuss] Adding mirrors to an existing zfs-pool > Date: Tue, 26 Jul 2011 08:54:38 -0600 > From: Cindy Swearingen > To: Bernd W. Hennig > References: <342994905.11311662049567.JavaMail.Twebapp@sf-app1> > > Hi Bernd, > > If you are talking about attaching 4 new disks to a non redundant pool > with 4 disks, and then you want to detach the previous disks then yes, > this is possible and a good way to migrate to new disks. > > The new disks must be the equivalent size or larger than the original > disks. > > See the hypothetical example below. > > If you mean something else, then please provide your zpool status > output. > > Thanks, > > Cindy > > > # zpool status tank > pool: tank > state: ONLINE > scan: resilvered 1018K in 0h0m with 0 errors on Fri Jul 22 15:54:52 2011 > config: > > NAMESTATE READ WRITE CKSUM > tankONLINE 0 0 0 > c4t1d0 ONLINE 0 0 0 > c4t2d0 ONLINE 0 0 0 > c4t3d0 ONLINE 0 0 0 > c4t4d0 ONLINE 0 0 0 > > > # zpool attach tank c4t1d0 c6t1d0 > # zpool attach tank c4t2d0 c6t2d0 > # zpool attach tank c4t3d0 c6t3d0 > # zpool attach tank c4t4d0 c6t4d0 > > The above syntax will create 4 mirrored pairs of disks. I was somewhat surprised when I first learned of this. In my head, I now remember it as "a single disk in ZFS seems to be treated as a one-disk mirror". Previously, in my head, single disks were very different objects from mirrors! I'm still impressed by the ability to attach and detach arbitrary numbers of disks to mirrors. It makes upgrading mirrored disks very very safe, since I can perform the entire procedure without ever reducing redundancy below my starting point (using the classic attach new, resilver, detach old sequence, repeated for however many disks were in the original mirror). -- David Dyer-Bennet, d...@dd-b.net; http://dd-b.net/ Snapshots: http://dd-b.net/dd-b/SnapshotAlbum/data/ Photos: http://dd-b.net/photography/gallery/ Dragaera: http://dragaera.info ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
Re: [zfs-discuss] Adding mirrors to an existing zfs-pool
On Tue, Jul 26, 2011 at 1:33 PM, Bernd W. Hennig wrote: > G'Day, > > - zfs pool with 4 disks (from Clariion A) > - must migrate to Clariion B (so I created 4 disks with the same size, > avaiable for the zfs) > > The zfs pool has no mirrors, my idea was to add the new 4 disks from > the Clariion B to the 4 disks which are still in the pool - and later > remove the original 4 disks. > > I only found in all example how to create a new pool with mirrors > but no example how to add to a pool without mirrors a mirror disk > for each "disk" in the pool. > > - is it possible to add disks to each disk in the pool (they have different > sizes, so I have exact add the correct disks form Clariion B to the > original disk from Clariion B) from "man zpool" zpool attach [-f] pool device new_device Attaches new_device to an existing zpool device. The existing device cannot be part of a raidz configuration. If device is not currently part of a mirrored configuration, device automatically transforms into a two-way mirror of device and new_device. If device is part of a two-way mirror, attaching new_device creates a three-way mirror, and so on. In either case, new_device begins to resilver immediately. -fForces use of new_device, even if its appears to be in use. Not all devices can be overridden in this manner. > - can I later "remove" the disks from the Clariion A, pool is intact, user > can work with the pool zpool detach pool device Detaches device from a mirror. The operation is refused if there are no other valid replicas of the data. If you're using raidz, you can't use zpool attach. Your best bet in this case is zpool replace. zpool replace [-f] pool old_device [new_device] Replaces old_device with new_device. This is equivalent to attaching new_device, waiting for it to resilver, and then detaching old_device. The size of new_device must be greater than or equal to the minimum size of all the devices in a mirror or raidz configuration. new_device is required if the pool is not redundant. If new_device is not specified, it defaults to old_device. This form of replacement is useful after an existing disk has failed and has been physically replaced. In this case, the new disk may have the same /dev path as the old device, even though it is actually a different disk. ZFS recognizes this. -fForces use of new_device, even if its appears to be in use. Not all devices can be overridden in this manner. -- Fajar ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
Re: [zfs-discuss] Adding mirrors to an existing zfs-pool
Hi It is better just ceate new ool in array 8 Then use cpio ro copy the data On 7/26/11, Bernd W. Hennig wrote: > G'Day, > > - zfs pool with 4 disks (from Clariion A) > - must migrate to Clariion B (so I created 4 disks with the same size, > avaiable for the zfs) > > The zfs pool has no mirrors, my idea was to add the new 4 disks from > the Clariion B to the 4 disks which are still in the pool - and later > remove the original 4 disks. > > I only found in all example how to create a new pool with mirrors > but no example how to add to a pool without mirrors a mirror disk > for each "disk" in the pool. > > - is it possible to add disks to each disk in the pool (they have different > sizes, so I have exact add the correct disks form Clariion B to the > original disk from Clariion B) > - can I later "remove" the disks from the Clariion A, pool is intact, user > can work with the pool > > > ?? > > Sorry for the beginner questions > > Tnx for help > -- > This message posted from opensolaris.org > ___ > zfs-discuss mailing list > zfs-discuss@opensolaris.org > http://mail.opensolaris.org/mailman/listinfo/zfs-discuss > -- Sent from my mobile device Hung-Sheng Tsao, Ph.D. laot...@gmail.com http://laotsao.wordpress.com cell:9734950840 gvoice:8623970640 ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
Re: [zfs-discuss] Adding mirrors to an existing zfs-pool]
Subject: Re: [zfs-discuss] Adding mirrors to an existing zfs-pool Date: Tue, 26 Jul 2011 08:54:38 -0600 From: Cindy Swearingen To: Bernd W. Hennig References: <342994905.11311662049567.JavaMail.Twebapp@sf-app1> Hi Bernd, If you are talking about attaching 4 new disks to a non redundant pool with 4 disks, and then you want to detach the previous disks then yes, this is possible and a good way to migrate to new disks. The new disks must be the equivalent size or larger than the original disks. See the hypothetical example below. If you mean something else, then please provide your zpool status output. Thanks, Cindy # zpool status tank pool: tank state: ONLINE scan: resilvered 1018K in 0h0m with 0 errors on Fri Jul 22 15:54:52 2011 config: NAMESTATE READ WRITE CKSUM tankONLINE 0 0 0 c4t1d0 ONLINE 0 0 0 c4t2d0 ONLINE 0 0 0 c4t3d0 ONLINE 0 0 0 c4t4d0 ONLINE 0 0 0 # zpool attach tank c4t1d0 c6t1d0 # zpool attach tank c4t2d0 c6t2d0 # zpool attach tank c4t3d0 c6t3d0 # zpool attach tank c4t4d0 c6t4d0 The above syntax will create 4 mirrored pairs of disks. Attach each new disk, wait for it to resilver, attach the next disk, resilver, and so on. I would scrub the pool after resilvering is complete, and check fmdump to ensure all new devices are operational. When all the disks are replaced and the pool is operational, detach the original disks. # zpool detach tank c4t1d0 # zpool detach tank c4t2d0 # zpool detach tank c4t3d0 # zpool detach tank c4t4d0 On 07/26/11 00:33, Bernd W. Hennig wrote: G'Day, - zfs pool with 4 disks (from Clariion A) - must migrate to Clariion B (so I created 4 disks with the same size, avaiable for the zfs) The zfs pool has no mirrors, my idea was to add the new 4 disks from the Clariion B to the 4 disks which are still in the pool - and later remove the original 4 disks. I only found in all example how to create a new pool with mirrors but no example how to add to a pool without mirrors a mirror disk for each "disk" in the pool. - is it possible to add disks to each disk in the pool (they have different sizes, so I have exact add the correct disks form Clariion B to the original disk from Clariion B) - can I later "remove" the disks from the Clariion A, pool is intact, user can work with the pool ?? Sorry for the beginner questions Tnx for help ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
Re: [zfs-discuss] Adding mirrors to an existing zfs-pool
Bernd W. Hennig wrote: G'Day, - zfs pool with 4 disks (from Clariion A) - must migrate to Clariion B (so I created 4 disks with the same size, avaiable for the zfs) The zfs pool has no mirrors, my idea was to add the new 4 disks from the Clariion B to the 4 disks which are still in the pool - and later remove the original 4 disks. I only found in all example how to create a new pool with mirrors but no example how to add to a pool without mirrors a mirror disk for each "disk" in the pool. - is it possible to add disks to each disk in the pool (they have different sizes, so I have exact add the correct disks form Clariion B to the original disk from Clariion B) - can I later "remove" the disks from the Clariion A, pool is intact, user can work with the pool Depends on a few things... What OS are you running, and what release/update or build? What's the RAID layout of your pool "zpool status"? -- Andrew Gabriel ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
[zfs-discuss] Adding mirrors to an existing zfs-pool
G'Day, - zfs pool with 4 disks (from Clariion A) - must migrate to Clariion B (so I created 4 disks with the same size, avaiable for the zfs) The zfs pool has no mirrors, my idea was to add the new 4 disks from the Clariion B to the 4 disks which are still in the pool - and later remove the original 4 disks. I only found in all example how to create a new pool with mirrors but no example how to add to a pool without mirrors a mirror disk for each "disk" in the pool. - is it possible to add disks to each disk in the pool (they have different sizes, so I have exact add the correct disks form Clariion B to the original disk from Clariion B) - can I later "remove" the disks from the Clariion A, pool is intact, user can work with the pool ?? Sorry for the beginner questions Tnx for help -- This message posted from opensolaris.org ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
