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Re: [linux-lvm] Help! unable to mount lv's - can't see why!



Hi Heinz,

Thanks for the help so far!

How can I find out the blocksize of my lv's? So far I've tried e2fsck on the
lv's using the mke2fs -n /dev/tripserv_vol/pages, for all blocksizes (-b
1024, 2048, 4096) but none of the superblocks respond to fsck. The only
thing I can think of now is letting fsck rebuild the superblock, but I have
to be sure of the blocksize for it to have any chance of success. Building
the lv's, I followed the following steps:

pvcreate /dev/hde
  /dev/hdf
  /dev/hdg
  /dev/hdh

vgcreate tripserv_vol /dev/hde /dev/hdf /dev/hdg /dev/hdh

lvcreate -i3 -I4 -L100M -nvolumename tripserv_vol

mke2fs -j -Lfslabel /dev/tripserv_vol/volumename

Cheers,
Robin


----- Original Message -----
From: "Heinz J . Mauelshagen" <mauelshagen sistina com>
To: <linux-lvm sistina com>
Sent: Wednesday, September 18, 2002 3:18 PM
Subject: Re: [linux-lvm] Help! unable to mount lv's - can't see why!


> 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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> read the LVM HOW-TO at http://www.sistina.com/lvm/Pages/howto.html
>
>





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