Re: gmirror per partition
On Thu, Jul 02, 2009 at 03:48:41PM +0200, Wojciech Puchar wrote: # gmirror label -vb round-robin root /dev/da0p2 gmirror: Can't store metadata on /dev/da0p2: Operation not permitted. isn't that partition accessed by other process or mounted? should it not be mounted? yes it should not, no matter what architecture. ok, thank you So how can I gmirror root partition? I can't unmount it, I think. Perhaps I need to use a single-user mode? Following is a gpart/gmirror report - some success and problems. I did a fresh FBSD current install on ia64 on directly attached scsi, da0. # gpart show = 34 35566411 da0 GPT (17G) 348192001 efi (400M) 819234 10485762 freebsd-ufs (512M) 1867810 41943043 freebsd-swap (2.0G) 6062114 20971524 freebsd-ufs (1.0G) 8159266 20971525 freebsd-ufs (1.0G) 10256418 253100276 freebsd-ufs (12G) # What I want is to mirror the whole of the boot disk to da1, which is identical to da0, but following Marcel's advice, will apply gmirror per partition. So starting with efi partition: First I create GPT scheme on da1 # gpart create -s gpt da1 da1 created # gpart show da1 = 34 35566411 da1 GPT (17G) 34 35566411 - free - (17G) # then I create EFI partition of the same size as on the boot disk, da0. # gpart add -b 34 -s 819200 -t efi da1 da1p1 added # gpart show da1 = 34 35566411 da1 GPT (17G) 348192001 efi (400M) 819234 34747211 - free - (17G) # then I umount /efi so that I can create gmirror label on da0p1. # umount /efi # gmirror label -vb round-robin efi /dev/da0p1 Metadata value stored on /dev/da0p1. Done. # Checking gmirror # gmirror status NameStatus Components mirror/efi COMPLETE da0p1 # and another check # gmirror list Geom name: efi State: COMPLETE Components: 1 Balance: round-robin Slice: 4096 Flags: NONE GenID: 0 SyncID: 1 ID: 3904698645 Providers: 1. Name: mirror/efi Mediasize: 419429888 (400M) Sectorsize: 512 Mode: r0w0e0 Consumers: 1. Name: da0p1 Mediasize: 419430400 (400M) Sectorsize: 512 Mode: r1w1e1 State: ACTIVE Priority: 0 Flags: NONE GenID: 0 SyncID: 1 ID: 1288665799 # now insert a spare partition, da1p1, into the mirror # gmirror insert efi /dev/da1p1 status looks fine # gmirror status NameStatus Components mirror/efi DEGRADED da0p1 da1p1 (44%) # gmirror status NameStatus Components mirror/efi DEGRADED da0p1 da1p1 (87%) # gmirror status NameStatus Components mirror/efi COMPLETE da0p1 da1p1 # and another check # gmirror list Geom name: efi State: COMPLETE Components: 2 Balance: round-robin Slice: 4096 Flags: NONE GenID: 0 SyncID: 1 ID: 3904698645 Providers: 1. Name: mirror/efi Mediasize: 419429888 (400M) Sectorsize: 512 Mode: r0w0e0 Consumers: 1. Name: da0p1 Mediasize: 419430400 (400M) Sectorsize: 512 Mode: r1w1e1 State: ACTIVE Priority: 0 Flags: NONE GenID: 0 SyncID: 1 ID: 1288665799 2. Name: da1p1 Mediasize: 419430400 (400M) Sectorsize: 512 Mode: r1w1e1 State: ACTIVE Priority: 0 Flags: NONE GenID: 0 SyncID: 1 ID: 1724596009 # So far, so good. Now, I don't need to create the filesystem on the mirror, because EFI was copied from da0p1 to da1p1. So, I try to mount /dev/mirror/efi # mount -t msdosfs /dev/mirror/efi /mnt # df Filesystem 1K-blocks UsedAvail Capacity Mounted on /dev/da0p2 507630 35904 431116 8%/ devfs 1 10 100%/dev /dev/da0p51012974 12 931926 0%/tmp /dev/da0p6 12252370 252608 11019574 2%/usr /dev/da0p41012974242 931696 0%/var /dev/mirror/efi409504 163264 24624040%/mnt # again seems ok so I proceed to modify /etc/fstab and change da0p1 into mirror/efi # cat /etc/fstab # DeviceMountpoint FStype Options DumpPass# /dev/da0p3 noneswapsw 0 0 /dev/da0p2 / ufs rw 1 1 /dev/mirror/efi /efimsdosfs rw 0 0 ^^^ /dev/da0p5 /tmpufs rw 2 2 /dev/da0p6 /usrufs rw 2 2 /dev/da0p4 /varufs rw 2 2 /dev/acd0 /cdrom cd9660 ro,noauto 0 0 # now I can try to just mount /efi # umount /mnt # mount /efi # df Filesystem 1K-blocks UsedAvail Capacity Mounted on /dev/da0p2 507630 35904 431116 8%/ devfs 1 10 100%/dev /dev/da0p51012974 12 931926 0%/tmp /dev/da0p6 12252370 252608 11019574 2%/usr /dev/da0p41012974242 931696 0%/var /dev/mirror/efi
Re: gmirror per partition
On Jul 3, 2009, at 12:12 PM, Anton Shterenlikht wrote: now to mirror root partition. My problem is that root is mounted and cannot (?) be unmounted, unlike /efi, on the live system. # gpart add -b 819234 -s 1048576 -t freebsd-ufs da1 da1p2 added # # gmirror label -vb round-robin root /dev/da0p2 gmirror: Can't store metadata on /dev/da0p2: Operation not permitted. # If I create gmirror on da1, the spare disk: # gmirror label -vb round-robin root /dev/da1p2 Metadata value stored on /dev/da0p1. Done. # so that # gmirror status NameStatus Components mirror/efi COMPLETE da0p1 da1p1 mirror/root COMPLETE da1p2 # then I still cannot insert da0p2 # gmirror insert root da0p2 gmirror: Cannot access provider da0p2. # So how can I gmirror root partion on a live system? You're almost there... I did this a while ago, can't remember when, but I just upgraded the system that had this from FreeBSD 6.3 of sometime in 2006 to 7.2. What I believe I did from this point on was: Copy everything from the root partition to mirror/root. Modify /etc/fstab to mount root on mirror/root. Reboot. Now the original root partition isn't mounted anymore, so we can do operate on it's geom stuff. gmirror insert root da0p2 That should be it. If that doesn't work you can always boot off a live file-system CD/DVD and perform these actions from there. You won't have man pages in that case though, or at least I couldn't find a way to read them off the DVD last I tried. One thing I'd like to warn about at this point: If you ever upgrade to a kernel with a newer geom metadata version and that new kernel crashes, you're left with a system where the new kernel can't boot at all while the old kernel can't mount the root mirror as it's now of a version it can't handle. You can however mount a single geom provider of that root file system (/dev/da1p2 for example) to try to fix things. That file-system WILL be dirty, but DON'T run fsck on it or you will destroy it's contents. That's what happened to my upgrade above... Thankfully it was only my root partition with hardly any data on it and I did make level 0 dumps before the upgrade, but I needed to restore that FS from a fixit shell without man pages. Augh! many thanks -- Anton Shterenlikht Room 2.6, Queen's Building Mech Eng Dept Bristol University University Walk, Bristol BS8 1TR, UK Tel: +44 (0)117 928 8233 Fax: +44 (0)117 929 4423 ___ freebsd-curr...@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to freebsd-current-unsubscr...@freebsd.org Alban Hertroys -- If you can't see the forest for the trees, cut the trees and you'll see there is no forest. !DSPAM:760,4a4de90f759155226611503! ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
SUCCESS: Re: gmirror per partition
On Fri, Jul 03, 2009 at 01:18:28PM +0200, Alban Hertroys wrote: On Jul 3, 2009, at 12:12 PM, Anton Shterenlikht wrote: now to mirror root partition. My problem is that root is mounted and cannot (?) be unmounted, unlike /efi, on the live system. # gpart add -b 819234 -s 1048576 -t freebsd-ufs da1 da1p2 added # # gmirror label -vb round-robin root /dev/da0p2 gmirror: Can't store metadata on /dev/da0p2: Operation not permitted. # If I create gmirror on da1, the spare disk: # gmirror label -vb round-robin root /dev/da1p2 Metadata value stored on /dev/da0p1. Done. # so that # gmirror status NameStatus Components mirror/efi COMPLETE da0p1 da1p1 mirror/root COMPLETE da1p2 # then I still cannot insert da0p2 # gmirror insert root da0p2 gmirror: Cannot access provider da0p2. # So how can I gmirror root partion on a live system? You're almost there... I did this a while ago, can't remember when, but I just upgraded the system that had this from FreeBSD 6.3 of sometime in 2006 to 7.2. What I believe I did from this point on was: Copy everything from the root partition to mirror/root. Modify /etc/fstab to mount root on mirror/root. Reboot. Now the original root partition isn't mounted anymore, so we can do operate on it's geom stuff. gmirror insert root da0p2 That should be it. If that doesn't work you can always boot off a live file-system CD/DVD and perform these actions from there. You won't have man pages in that case though, or at least I couldn't find a way to read them off the DVD last I tried. One thing I'd like to warn about at this point: If you ever upgrade to a kernel with a newer geom metadata version and that new kernel crashes, you're left with a system where the new kernel can't boot at all while the old kernel can't mount the root mirror as it's now of a version it can't handle. You can however mount a single geom provider of that root file system (/dev/da1p2 for example) to try to fix things. That file-system WILL be dirty, but DON'T run fsck on it or you will destroy it's contents. That's what happened to my upgrade above... Thankfully it was only my root partition with hardly any data on it and I did make level 0 dumps before the upgrade, but I needed to restore that FS from a fixit shell without man pages. Augh! thank you, that was helpful. I think I've got it, but it's a bit more complex on ia64 because /boot is a symlink to /efi/boot, which is a separate partition. Anyway, I've got: # gmirror status NameStatus Components mirror/efi COMPLETE da0p1 da1p1 mirror/root COMPLETE da0p2 da1p2 mirror/swap COMPLETE da0p3 da1p3 mirror/var COMPLETE da1p4 da0p4 mirror/tmp COMPLETE da1p5 da0p5 mirror/usr DEGRADED da1p6 da0p6 (24%) # I'll try to write up my experience and post later. thanks again -- Anton Shterenlikht Room 2.6, Queen's Building Mech Eng Dept Bristol University University Walk, Bristol BS8 1TR, UK Tel: +44 (0)117 928 8233 Fax: +44 (0)117 929 4423 ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
Re: gmirror per partition. Was: Re: gmirror gm0 destroyed on shutdown; GPT corrupt
On Wed, Jul 01, 2009 at 10:00:54PM +0200, Wojciech Puchar wrote: It's better to use gmirror per partition. Like this? # gmirror label -vb round-robin root /dev/da0p2 gmirror: Can't store metadata on /dev/da0p2: Operation not permitted. isn't that partition accessed by other process or mounted? should it not be mounted? Sorry, I was just following the handbook, but I now understand it is incorrect when it comes to ia64. many thanks anton ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org -- Anton Shterenlikht Room 2.6, Queen's Building Mech Eng Dept Bristol University University Walk, Bristol BS8 1TR, UK Tel: +44 (0)117 928 8233 Fax: +44 (0)117 929 4423 ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
Re: gmirror per partition. Was: Re: gmirror gm0 destroyed on shutdown; GPT corrupt
# gmirror label -vb round-robin root /dev/da0p2 gmirror: Can't store metadata on /dev/da0p2: Operation not permitted. isn't that partition accessed by other process or mounted? should it not be mounted? yes it should not, no matter what architecture. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
Re: gmirror per partition. Was: Re: gmirror gm0 destroyed on shutdown; GPT corrupt
It's better to use gmirror per partition. Like this? # gmirror label -vb round-robin root /dev/da0p2 gmirror: Can't store metadata on /dev/da0p2: Operation not permitted. isn't that partition accessed by other process or mounted? ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
