[zfs-discuss] Do the disks in a zpool have a private region that I can read to get a zpool name or id?
Hi all, My cu has following question. Assume I have allocated a LUN from external storage to two hosts ( by mistake ). I create a zpool with this LUN on host1 with no errors. On host2 when I try to create a zpool by using the same disk ( which is allocated to host2 as well ), zpool create - comes back with an error saying /dev/dsk/cXtXdX is part of exported or potentially active ZFS pool test. Is there a way for me to check what zpool disk belongs to from 'host2'. Do the disks in a zpool have a private region that I can read to get a zpool name or id? Steps required to reproduce the problem Disk doubly allocated to host1, host2 host1 sees disk as disk100 host2 sees disk as disk101 host1# zpool create host1_pool disk1 disk2 disk100 returns success ( as expected ) host2# zpool create host2_pool disk1 disk2 disk101 invalid dev specification use '-f' to overrite the following errors: /dev/dsk/disk101 is part of exported or potentially active ZFS pool test. Please see zpool zpool did catch that the disk is part of an active pool, but since it's not on the same host I am not getting the name of the pool to which disk101 is allocated. It's possible we might go ahead and use '-f' option to create the zpool and start using this filesystem. By doing this we're potentially destroying filesystems on host1, host2 which could lead to severe downtime. Any way to get the pool name to which the disk101 is assigned ( with a different name on a different host )? This would aid us tremendously in avoiding a potential issue. This has happened with Solaris 9, UFS once before taking out two Solaris machines. What happens if diskis assigned to a AIX box and is setup as part of a Volume manager on AIX and we try to create 'zpool' on Solaris host. Will ZFS catch this, by saying something wrong with the disk? Regards, Adele ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
Re: [zfs-discuss] Do the disks in a zpool have a private region that I can read to get a zpool name or id?
Take a look at ZDB (the ZFS Debugger). Probably the zdb -l (label dump) option would suffice for your task, i.e.: # zdb -l /dev/dsk/c4t1d0s0 | egrep 'host|uid|name|devid|path' name: 'rpool' pool_guid: 12076177533503245216 hostid: 13583512 hostname: 'bofh-sol' top_guid: 1792815639752064612 guid: 1792815639752064612 guid: 1792815639752064612 path: '/dev/dsk/c4t1d0s0' devid: 'id1,sd@SATA_ST3808110AS_5LR557KB/a' phys_path: '/pci@0,0/pci8086,2847@1c,4/pci1043,81e4@0/disk@1,0:a' (repeats for all 4 labels, values should match for a healthy pool) 2012-01-12 18:51, adele@oracle.com wrote: Hi all, My cu has following question. Assume I have allocated a LUN from external storage to two hosts ( by mistake ). I create a zpool with this LUN on host1 with no errors. On host2 when I try to create a zpool by using the same disk ( which is allocated to host2 as well ), zpool create - comes back with an error saying /dev/dsk/cXtXdX is part of exported or potentially active ZFS pool test. Is there a way for me to check what zpool disk belongs to from 'host2'. Do the disks in a zpool have a private region that I can read to get a zpool name or id? Steps required to reproduce the problem Disk doubly allocated to host1, host2 host1 sees disk as disk100 host2 sees disk as disk101 host1# zpool create host1_pool disk1 disk2 disk100 returns success ( as expected ) host2# zpool create host2_pool disk1 disk2 disk101 invalid dev specification use '-f' to overrite the following errors: /dev/dsk/disk101 is part of exported or potentially active ZFS pool test. Please see zpool zpool did catch that the disk is part of an active pool, but since it's not on the same host I am not getting the name of the pool to which disk101 is allocated. It's possible we might go ahead and use '-f' option to create the zpool and start using this filesystem. By doing this we're potentially destroying filesystems on host1, host2 which could lead to severe downtime. Any way to get the pool name to which the disk101 is assigned ( with a different name on a different host )? This would aid us tremendously in avoiding a potential issue. This has happened with Solaris 9, UFS once before taking out two Solaris machines. What happens if diskis assigned to a AIX box and is setup as part of a Volume manager on AIX and we try to create 'zpool' on Solaris host. Will ZFS catch this, by saying something wrong with the disk? Regards, Adele ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss HTH, //Jim Klimov ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
Re: [zfs-discuss] Do the disks in a zpool have a private region that I can read to get a zpool name or id?
Followup: namely, the 'hostname' field should report the host which has last (or currently) imported the pool, and the 'name' field is the pool name as of last import (can be changed by like zpool import pool1 testpool2). HTH, //Jim Klimov ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
Re: [zfs-discuss] Do the disks in a zpool have a private region that I can read to get a zpool name or id?
if the disks are assigned by two hosts may be just do zpool import should see the zpool in other hosts? not sure as for AIX, control hdd, zpool will need partition that solaris could understand i do not know what AIX used for partition should not be the same for solaris Sent from my iPad On Jan 12, 2012, at 9:51, adele@oracle.com adele@oracle.com wrote: Hi all, My cu has following question. Assume I have allocated a LUN from external storage to two hosts ( by mistake ). I create a zpool with this LUN on host1 with no errors. On host2 when I try to create a zpool by using the same disk ( which is allocated to host2 as well ), zpool create - comes back with an error saying /dev/dsk/cXtXdX is part of exported or potentially active ZFS pool test. Is there a way for me to check what zpool disk belongs to from 'host2'. Do the disks in a zpool have a private region that I can read to get a zpool name or id? Steps required to reproduce the problem Disk doubly allocated to host1, host2 host1 sees disk as disk100 host2 sees disk as disk101 host1# zpool create host1_pool disk1 disk2 disk100 returns success ( as expected ) host2# zpool create host2_pool disk1 disk2 disk101 invalid dev specification use '-f' to overrite the following errors: /dev/dsk/disk101 is part of exported or potentially active ZFS pool test. Please see zpool zpool did catch that the disk is part of an active pool, but since it's not on the same host I am not getting the name of the pool to which disk101 is allocated. It's possible we might go ahead and use '-f' option to create the zpool and start using this filesystem. By doing this we're potentially destroying filesystems on host1, host2 which could lead to severe downtime. Any way to get the pool name to which the disk101 is assigned ( with a different name on a different host )? This would aid us tremendously in avoiding a potential issue. This has happened with Solaris 9, UFS once before taking out two Solaris machines. What happens if diskis assigned to a AIX box and is setup as part of a Volume manager on AIX and we try to create 'zpool' on Solaris host. Will ZFS catch this, by saying something wrong with the disk? Regards, Adele ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
Re: [zfs-discuss] Do the disks in a zpool have a private region that I can read to get a zpool name or id?
Jim and LaoTsao, Thanks a lot for your quick response. zdb might be good enough to get zpoll name or id from any disk in zool. CU will try it this afternoon. As of second situation - one host is AIX and the second disk is Solaris, CU wonders if zdb will show anything. I will also post questions to Oracle internal zfs alias to see if they have any input. Best regards, Adele On 1/12/2012 9:58 AM, Jim Klimov wrote: Take a look at ZDB (the ZFS Debugger). Probably the zdb -l (label dump) option would suffice for your task, i.e.: # zdb -l /dev/dsk/c4t1d0s0 | egrep 'host|uid|name|devid|path' name: 'rpool' pool_guid: 12076177533503245216 hostid: 13583512 hostname: 'bofh-sol' top_guid: 1792815639752064612 guid: 1792815639752064612 guid: 1792815639752064612 path: '/dev/dsk/c4t1d0s0' devid: 'id1,sd@SATA_ST3808110AS_5LR557KB/a' phys_path: '/pci@0,0/pci8086,2847@1c,4/pci1043,81e4@0/disk@1,0:a' (repeats for all 4 labels, values should match for a healthy pool) 2012-01-12 18:51, adele@oracle.com wrote: Hi all, My cu has following question. Assume I have allocated a LUN from external storage to two hosts ( by mistake ). I create a zpool with this LUN on host1 with no errors. On host2 when I try to create a zpool by using the same disk ( which is allocated to host2 as well ), zpool create - comes back with an error saying /dev/dsk/cXtXdX is part of exported or potentially active ZFS pool test. Is there a way for me to check what zpool disk belongs to from 'host2'. Do the disks in a zpool have a private region that I can read to get a zpool name or id? Steps required to reproduce the problem Disk doubly allocated to host1, host2 host1 sees disk as disk100 host2 sees disk as disk101 host1# zpool create host1_pool disk1 disk2 disk100 returns success ( as expected ) host2# zpool create host2_pool disk1 disk2 disk101 invalid dev specification use '-f' to overrite the following errors: /dev/dsk/disk101 is part of exported or potentially active ZFS pool test. Please see zpool zpool did catch that the disk is part of an active pool, but since it's not on the same host I am not getting the name of the pool to which disk101 is allocated. It's possible we might go ahead and use '-f' option to create the zpool and start using this filesystem. By doing this we're potentially destroying filesystems on host1, host2 which could lead to severe downtime. Any way to get the pool name to which the disk101 is assigned ( with a different name on a different host )? This would aid us tremendously in avoiding a potential issue. This has happened with Solaris 9, UFS once before taking out two Solaris machines. What happens if diskis assigned to a AIX box and is setup as part of a Volume manager on AIX and we try to create 'zpool' on Solaris host. Will ZFS catch this, by saying something wrong with the disk? Regards, Adele ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss HTH, //Jim Klimov ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
Re: [zfs-discuss] Do the disks in a zpool have a private region that I can read to get a zpool name or id?
2012-01-12 20:21, adele@oracle.com пишет: Jim and LaoTsao, Thanks a lot for your quick response. zdb might be good enough to get zpoll name or id from any disk in zool. CU will try it this afternoon. As of second situation - one host is AIX and the second disk is Solaris, CU wonders if zdb will show anything. I will also post questions to Oracle internal zfs alias to see if they have any input. What happens if diskis assigned to a AIX box and is setup as part of a Volume manager on AIX and we try to create 'zpool' on Solaris host. Will ZFS catch this, by saying something wrong with the disk? I think you'd be relatively lucky if Solaris and AIX use compatible disk partitioning schemes - even top-level ones like GPT/MBR for partitioning and EFI/SMI for further labelling of slices. While it is likely that most systems use (and understand) the same set of partitioning layouts, internals like slice labelling (if any) are usually OS-centric, and most large-vendor OSes (unlike opensource OSes or FS driver projects) don't understand competitiors' labels and FSes. ZFS and related Solaris tools (format) do warn you about disk usages that Solaris understands and tracks, i.e. that a device (disk, slice) is actively busy or passively formatted with ZFS, UFS, SVM, swap, etc. Maybe also it will also report VxFS and pcfs = FAT? That's probably it. I would be surprised if it found any other FSes, be it AIX, or NTFS, or ext3/ext4/xfs/reiserfs, or whatever else out there is popular. Good luck, and let us know if your practice proves my generic rant wrong! ;) //Jim Klimov ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
