On Wed, Sep 18, 2002 at 02:07:18PM +0200, Robin Edgar - Tripany wrote:
> Hi,
>
> I had 4 (ide) disks in an array (and 1 vg) of which one (hde) broke. As I was not too sure of the stability of the system, I decided to do a dd of the disk byte by byte to another identical disk. After this was done (with loads of sector unreadable errors) I replaced the old disk with the new disk, rebooted the system and by all standards all seems well (see below):
Robin,
lots of read errors during dd likely left you with a corrupted primary
superblock of the filesystem.
> Unfortunately, only the /dev/tripserv_vol/docu will mount well!
> /dev/tripserv_vol/pages gives the following error:
>
> # mount /dev/tripserv_vol/pages /c
> mount: you must specify the filesystem type
>
> # mount /dev/tripserv_vol/pages /c -t ext3
> mount: wrong fs type, bad option, bad superblock on /dev/tripserv_vol/pages,
> or too many mounted file systems
>
> Anyone have any ideas why it won't mount?!
You need to figure out, if /dev/tripserv_vol/docu doesn't have *any* extents
allocated on the replaced disk. Try "lvdisplay -v /dev/tripserv_vol/docu"
to achive this. If it has, you'll likely find corrupted files in this one
too.
For the failing mount you might want to try
"mount -r -osb=$ALTERNATE_SUPERBLOCK /dev/tripserv_vol/pages /c".
In case you've got a logical 4k block size of the filesystem,
ALTERNATE_SUPERBLOCK=131072 would access the first backup copy.
See "man mount" and look for the ext2 mount option "sb=" for more information.
In case you have success with using a backup superblock this way, you need to
backup all files you can access successfully first, then recreate the filesystem
and restore. It is unlikely in the case of lots of read errors during dd, that
a fsck will help you. You'll probably end up with piles of lost+found entries.
Regards,
Heinz -- The LVM Guy --
>
> Cheers,
> Robin Edgar
>
> #pvscan:
> pvscan -- reading all physical volumes (this may take a while...)
> pvscan -- ACTIVE PV "/dev/hdg1" of VG "tripserv_vol" [38.16 GB / 7.93 GB free]
> pvscan -- ACTIVE PV "/dev/hdh1" of VG "tripserv_vol" [38.16 GB / 8.01 GB free]
> pvscan -- ACTIVE PV "/dev/hde1" of VG "tripserv_vol" [55.91 GB / 0 free]
> pvscan -- ACTIVE PV "/dev/hdf1" of VG "tripserv_vol" [55.91 GB / 3.37 GB free]
> pvscan -- total: 4 [188.16 GB] / in use: 4 [188.16 GB] / in no VG: 0 [0]
>
> (identical output to before changing the disks around)
>
> #pvdisplay /dev/hde1
> --- Physical volume ---
> PV Name /dev/hde1
> VG Name tripserv_vol
> PV Size 55.92 GB [117266625 secs] / NOT usable 4.18 MB [LVM: 179 KB]
> PV# 1
> PV Status available
> Allocatable yes (but full)
> Cur LV 20
> PE Size (KByte) 4096
> Total PE 14313
> Free PE 0
> Allocated PE 14313
> PV UUID KCIKwa-3lvx-k7bj-27ks-hGlI-oZRo-5q7CjM
>
> (also identical)
>
> #vgck -v
> vgck -- locking logical volume manager
> vgck -- finding all volume group(s)
> vgck -- checking volume group name "tripserv_vol"
> vgck -- checking existence of volume group "tripserv_vol"
> vgck -- reading volume group data for "tripserv_vol" from lvmtab
> vgck -- checking volume group consistency of "tripserv_vol" in lvmtab
> vgck -- VGDA of "tripserv_vol" in lvmtab is consistent
> vgck -- reading volume group data for "tripserv_vol" from physical volume(s)
> vgck -- checking volume group consistency of "tripserv_vol" on physical volumes
> vgck -- VGDA of "tripserv_vol" on physical volumes is consistent
> vgck -- unlocking logical volume manager
>
> # vgdisplay
> --- Volume group ---
> VG Name tripserv_vol
> VG Access read/write
> VG Status available/resizable
> VG # 0
> MAX LV 255
> Cur LV 22
> Open LV 1
> MAX LV Size 255.99 GB
> Max PV 255
> Cur PV 4
> Act PV 4
> VG Size 188.13 GB
> PE Size 4 MB
> Total PE 48162
> Alloc PE / Size 43220 / 168.83 GB
> Free PE / Size 4942 / 19.30 GB
> VG UUID KDiCWx-ae2w-oDnx-Hl5O-Amhd-fIM3-y51bIX
>
> # vgscan -v
> vgscan -- removing "/etc/lvmtab" and "/etc/lvmtab.d"
> vgscan -- creating empty "/etc/lvmtab" and "/etc/lvmtab.d"
> vgscan -- reading all physical volumes (this may take a while...)
> vgscan -- scanning for all active volume group(s) first
> vgscan -- found active volume group "tripserv_vol"
> vgscan -- reading data of volume group "tripserv_vol" from physical volume(s)
> vgscan -- inserting "tripserv_vol" into lvmtab
> vgscan -- backing up volume group "tripserv_vol"
> vgscan -- checking volume group name "tripserv_vol"
> vgscan -- checking volume group consistency of "tripserv_vol"
> vgscan -- checking existence of "/etc/lvmtab.d"
> vgscan -- storing volume group data of "tripserv_vol" in "/etc/lvmtab.d/tripserv_vol.tmp"
> vgscan -- storing physical volume data of "tripserv_vol" in "/etc/lvmtab.d/tripserv_vol.tmp"
> vgscan -- storing logical volume data of volume group "tripserv_vol" in "/etc/lvmtab.d/tripserv_vol.tmp"
> vgscan -- renaming "/etc/lvmtab.d/tripserv_vol.tmp" to "/etc/lvmtab.d/tripserv_vol"
> vgscan -- removing special files and directory for volume group "tripserv_vol"
> vgscan -- creating directory and group character special file for "tripserv_vol"
> vgscan -- creating block device special files for tripserv_vol
> vgscan -- "/etc/lvmtab" and "/etc/lvmtab.d" successfully created
> vgscan -- WARNING: This program does not do a VGDA backup of your volume group
>
> #lvscan
> lvscan -- ACTIVE Original "/dev/tripserv_vol/docu" [512 MB] striped[4]
> lvscan -- ACTIVE Original "/dev/tripserv_vol/install" [10 GB] striped[4]
> lvscan -- ACTIVE Original "/dev/tripserv_vol/pages" [20 GB] striped[4]
> lvscan -- ACTIVE "/dev/tripserv_vol/gfx" [10 GB] striped[4]
> lvscan -- ACTIVE "/dev/tripserv_vol/sfx" [10 GB] striped[4]
> lvscan -- ACTIVE "/dev/tripserv_vol/people" [20 GB] striped[4]
> lvscan -- ACTIVE Original "/dev/tripserv_vol/dim" [2 GB] striped[4]
> lvscan -- ACTIVE "/dev/tripserv_vol/mp3" [20 GB] striped[4]
> lvscan -- ACTIVE "/dev/tripserv_vol/applications" [2 GB] striped[4]
> lvscan -- ACTIVE Original "/dev/tripserv_vol/code" [512 MB] striped[4]
> lvscan -- ACTIVE "/dev/tripserv_vol/dumpdir" [10 GB] striped[4]
> lvscan -- ACTIVE Original "/dev/tripserv_vol/homes" [10 GB] striped[4]
> lvscan -- ACTIVE Original "/dev/tripserv_vol/info" [5 GB] striped[4]
> lvscan -- ACTIVE "/dev/tripserv_vol/log" [252 MB] striped[3]
> lvscan -- ACTIVE "/dev/tripserv_vol/store" [608 MB] striped[4]
> lvscan -- ACTIVE Snapshot "/dev/tripserv_vol/docusnap" [492.19 MB] of /dev/tripserv_vol/docu
> lvscan -- ACTIVE Snapshot "/dev/tripserv_vol/installsnap" [9.84 GB] of /dev/tripserv_vol/install
> lvscan -- ACTIVE Snapshot "/dev/tripserv_vol/dimsnap" [1.97 GB] of /dev/tripserv_vol/dim
> lvscan -- ACTIVE Snapshot "/dev/tripserv_vol/codesnap" [504 MB] of /dev/tripserv_vol/code
> lvscan -- ACTIVE Snapshot "/dev/tripserv_vol/pagessnap" [19.69 GB] of /dev/tripserv_vol/pages
> lvscan -- ACTIVE Snapshot "/dev/tripserv_vol/infosnap" [4.92 GB] of /dev/tripserv_vol/info
> lvscan -- ACTIVE Snapshot "/dev/tripserv_vol/homessnap" [9.84 GB] of /dev/tripserv_vol/homes
> lvscan -- 22 logical volumes with 168.08 GB total in 1 volume group
> lvscan -- 22 active logical volumes
>
> # lvdisplay /dev/tripserv_vol/docu
> --- Logical volume ---
> LV Name /dev/tripserv_vol/docu
> VG Name tripserv_vol
> LV Write Access read/write
> LV snapshot status source of
> /dev/tripserv_vol/docusnap [active]
> LV Status available
> LV # 1
> # open 1
> LV Size 512 MB
> Current LE 128
> Allocated LE 128
> Stripes 4
> Stripe size (KByte) 4
> Allocation next free
> Read ahead sectors 120
> Block device 58:0
>
> # lvdisplay /dev/tripserv_vol/people
> --- Logical volume ---
> LV Name /dev/tripserv_vol/people
> VG Name tripserv_vol
> LV Write Access read/write
> LV Status available
> LV # 6
> # open 0
> LV Size 20 GB
> Current LE 5120
> Allocated LE 5120
> Stripes 4
> Stripe size (KByte) 4
> Allocation next free
> Read ahead sectors 120
> Block device 58:5
>
> # lvdisplay /dev/tripserv_vol/pages
> --- Logical volume ---
> LV Name /dev/tripserv_vol/pages
> VG Name tripserv_vol
> LV Write Access read/write
> LV snapshot status source of
> /dev/tripserv_vol/pagessnap [active]
> LV Status available
> LV # 3
> # open 0
> LV Size 20 GB
> Current LE 5120
> Allocated LE 5120
> Stripes 4
> Stripe size (KByte) 4
> Allocation next free
> Read ahead sectors 120
> Block device 58:2
>
> tripserv:/# lvdisplay /dev/tripserv_vol/pagessnap
> --- Logical volume ---
> LV Name /dev/tripserv_vol/pagessnap
> VG Name tripserv_vol
> LV Write Access read only
> LV snapshot status active destination for /dev/tripserv_vol/pages
> LV Status available
> LV # 20
> # open 0
> LV Size 20 GB
> Current LE 5120
> Allocated LE 5120
> snapshot chunk size 64 KB
> Allocated to snapshot 0.00% [0/19.69 GB]
> Allocated to COW-table 320 MB
> Stripes 4
> Stripe size (KByte) 4
> Allocation next free
> Read ahead sectors 120
> Block device 58:19
>
> # lvdisplay /dev/tripserv_vol/docusnap
> --- Logical volume ---
> LV Name /dev/tripserv_vol/docusnap
> VG Name tripserv_vol
> LV Write Access read only
> LV snapshot status active destination for /dev/tripserv_vol/docu
> LV Status available
> LV # 16
> # open 0
> LV Size 512 MB
> Current LE 128
> Allocated LE 128
> snapshot chunk size 64 KB
> Allocated to snapshot 0.05% [256 KB/492.19 MB]
> Allocated to COW-table 7.81 MB
> Stripes 4
> Stripe size (KByte) 4
> Allocation next free
> Read ahead sectors 120
> Block device 58:15
>
> So it all looks good!
*** Software bugs are stupid.
Nevertheless it needs not so stupid people to solve them ***
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
Heinz Mauelshagen Sistina Software Inc.
Senior Consultant/Developer Am Sonnenhang 11
56242 Marienrachdorf
Germany
Mauelshagen@Sistina.com +49 2626 141200
FAX 924446
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