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Kristoffer Egefelt

2011-Dec-29 22:44 UTC

XCP - corrupted VDI footer ?

Hi list,

I''ve seen corrupted footers on VDI''s larger than 2TB, when
physical machines crashed.

This time, the VDI is only 200GB, no physical machine has crashed and the
virtual machine is functioning normally, but a SR rescan causes the following in
the messages log (see below)

Any ideas how this happened, or what to do about it?

Thanks

Regards
Kristoffer


Dec 29 23:35:32 ad vhd-util: libvhd::vhd_read_footer_at:
/dev/VG_XenStorage-f60e4e9f-3b8a-0be7-07aa-59fdce05d4c3/VHD-35381293-f097-48e4-85cf-3382bc85446f:
reading footer at 0x32197ffe00 failed: -22
Dec 29 23:35:32 ad vhd-util: libvhd::vhd_read:
/dev/VG_XenStorage-f60e4e9f-3b8a-0be7-07aa-59fdce05d4c3/VHD-35381293-f097-48e4-85cf-3382bc85446f:
read of 512 returned 0, errno: -22
Dec 29 23:35:32 ad vhd-util: libvhd::vhd_read_short_footer:
/dev/VG_XenStorage-f60e4e9f-3b8a-0be7-07aa-59fdce05d4c3/VHD-35381293-f097-48e4-85cf-3382bc85446f:
failed reading short footer: -22
Dec 29 23:35:32 ad vhd-util: libvhd::vhd_read_footer_at:
/dev/VG_XenStorage-f60e4e9f-3b8a-0be7-07aa-59fdce05d4c3/VHD-35381293-f097-48e4-85cf-3382bc85446f:
reading footer at 0x32197ffe00 failed: -22
Dec 29 23:35:32 ad vhd-util: libvhd::vhd_read:
/dev/VG_XenStorage-f60e4e9f-3b8a-0be7-07aa-59fdce05d4c3/VHD-35381293-f097-48e4-85cf-3382bc85446f:
read of 512 returned 0, errno: -22
Dec 29 23:35:32 ad vhd-util: libvhd::vhd_read_short_footer:
/dev/VG_XenStorage-f60e4e9f-3b8a-0be7-07aa-59fdce05d4c3/VHD-35381293-f097-48e4-85cf-3382bc85446f:
failed reading short footer: -22
Dec 29 23:35:33 ad vhd-util: libvhd::vhd_read_footer_at:
/dev/VG_XenStorage-f60e4e9f-3b8a-0be7-07aa-59fdce05d4c3/VHD-35381293-f097-48e4-85cf-3382bc85446f:
reading footer at 0x32197ffe00 failed: -22
Dec 29 23:35:33 ad vhd-util: libvhd::vhd_read:
/dev/VG_XenStorage-f60e4e9f-3b8a-0be7-07aa-59fdce05d4c3/VHD-35381293-f097-48e4-85cf-3382bc85446f:
read of 512 returned 0, errno: -22
Dec 29 23:35:33 ad vhd-util: libvhd::vhd_read_short_footer:
/dev/VG_XenStorage-f60e4e9f-3b8a-0be7-07aa-59fdce05d4c3/VHD-35381293-f097-48e4-85cf-3382bc85446f:
failed reading short footer: -22
Dec 29 23:35:33 ad vhd-util: libvhd::vhd_read_footer_at:
/dev/VG_XenStorage-f60e4e9f-3b8a-0be7-07aa-59fdce05d4c3/VHD-35381293-f097-48e4-85cf-3382bc85446f:
reading footer at 0x32197ffe00 failed: -22
Dec 29 23:35:33 ad vhd-util: libvhd::vhd_read:
/dev/VG_XenStorage-f60e4e9f-3b8a-0be7-07aa-59fdce05d4c3/VHD-35381293-f097-48e4-85cf-3382bc85446f:
read of 512 returned 0, errno: -22
Dec 29 23:35:33 ad vhd-util: libvhd::vhd_read_short_footer:
/dev/VG_XenStorage-f60e4e9f-3b8a-0be7-07aa-59fdce05d4c3/VHD-35381293-f097-48e4-85cf-3382bc85446f:
failed reading short footer: -22
Dec 29 23:35:35 ad tapdisk[15898]:
/dev/VG_XenStorage-f60e4e9f-3b8a-0be7-07aa-59fdce05d4c3/VHD-35381293-f097-48e4-85cf-3382bc85446f:
b: 102400, a: 3158, f: 987, n: 12968880
Dec 29 23:35:35 ad tapdisk[15898]: closed image
/dev/VG_XenStorage-f60e4e9f-3b8a-0be7-07aa-59fdce05d4c3/VHD-35381293-f097-48e4-85cf-3382bc85446f
(0 users, state: 0x00000000, type: 4)
Dec 29 23:35:38 ad tapdisk[15898]:
/dev/VG_XenStorage-f60e4e9f-3b8a-0be7-07aa-59fdce05d4c3/VHD-35381293-f097-48e4-85cf-3382bc85446f
version: tap 0x00010003, b: 102400, a: 0, f: 0, n: 8455
Dec 29 23:35:38 ad tapdisk[15898]: opened image
/dev/VG_XenStorage-f60e4e9f-3b8a-0be7-07aa-59fdce05d4c3/VHD-35381293-f097-48e4-85cf-3382bc85446f
(1 users, state: 0x00000001, type: 4)
Dec 29 23:35:38 ad tapdisk[15898]:
/dev/VG_XenStorage-f60e4e9f-3b8a-0be7-07aa-59fdce05d4c3/VHD-35381293-f097-48e4-85cf-3382bc85446f:
type:vhd(4) storage:lvm(3)

Joseph Hom

2012-Jan-04 16:31 UTC

head link

Re: XCP - corrupted VDI footer ?

Is the VDI on some kind of network storage? 

I''ve had this happen due to the vhd semantics put onto lv for vdi. The
semantics are sparse and the footer has to move everytime the disk
"grows" in use. This can lead to the footer not being moved properly.

I''ve had luck dd''ing out the lv to a flat file with the .vhd
extension. After this you can import the vhd to winimage and have it make a copy
of the disk. Winimage appears to ignore the bad footer and uses the backup. At
this point you can make a new vhd with the data, and the dd the new vhd back to
the lv.

-----Original Message-----
From: xen-users-bounces@lists.xensource.com
[mailto:xen-users-bounces@lists.xensource.com] On Behalf Of Kristoffer Egefelt
Sent: Thursday, December 29, 2011 4:45 PM
To: xen-users@lists.xensource.com
Subject: [Xen-users] XCP - corrupted VDI footer ?

Hi list,

I''ve seen corrupted footers on VDI''s larger than 2TB, when
physical machines crashed.

This time, the VDI is only 200GB, no physical machine has crashed and the
virtual machine is functioning normally, but a SR rescan causes the following in
the messages log (see below)

Any ideas how this happened, or what to do about it?

Thanks

Regards
Kristoffer


Dec 29 23:35:32 ad vhd-util: libvhd::vhd_read_footer_at:
/dev/VG_XenStorage-f60e4e9f-3b8a-0be7-07aa-59fdce05d4c3/VHD-35381293-f097-48e4-85cf-3382bc85446f:
reading footer at 0x32197ffe00 failed: -22 Dec 29 23:35:32 ad vhd-util:
libvhd::vhd_read:
/dev/VG_XenStorage-f60e4e9f-3b8a-0be7-07aa-59fdce05d4c3/VHD-35381293-f097-48e4-85cf-3382bc85446f:
read of 512 returned 0, errno: -22 Dec 29 23:35:32 ad vhd-util:
libvhd::vhd_read_short_footer:
/dev/VG_XenStorage-f60e4e9f-3b8a-0be7-07aa-59fdce05d4c3/VHD-35381293-f097-48e4-85cf-3382bc85446f:
failed reading short footer: -22 Dec 29 23:35:32 ad vhd-util:
libvhd::vhd_read_footer_at:
/dev/VG_XenStorage-f60e4e9f-3b8a-0be7-07aa-59fdce05d4c3/VHD-35381293-f097-48e4-85cf-3382bc85446f:
reading footer at 0x32197ffe00 failed: -22 Dec 29 23:35:32 ad vhd-util: libv
 hd::vhd_read:
/dev/VG_XenStorage-f60e4e9f-3b8a-0be7-07aa-59fdce05d4c3/VHD-35381293-f097-48e4-85cf-3382bc85446f:
read of 512 returned 0, errno: -22 Dec 29 23:35:32 ad vhd-util:
libvhd::vhd_read_short_footer:
/dev/VG_XenStorage-f60e4e9f-3b8a-0be7-07aa-59fdce05d4c3/VHD-35381293-f097-48e4-85cf-3382bc85446f:
failed reading short footer: -22 Dec 29 23:35:33 ad vhd-util:
libvhd::vhd_read_footer_at:
/dev/VG_XenStorage-f60e4e9f-3b8a-0be7-07aa-59fdce05d4c3/VHD-35381293-f097-48e4-85cf-3382bc85446f:
reading footer at 0x32197ffe00 failed: -22 Dec 29 23:35:33 ad vhd-util:
libvhd::vhd_read:
/dev/VG_XenStorage-f60e4e9f-3b8a-0be7-07aa-59fdce05d4c3/VHD-35381293-f097-48e4-85cf-3382bc85446f:
read of 512 returned 0, errno: -22 Dec 29 23:35:33 ad vhd-util:
libvhd::vhd_read_short_footer: /dev/VG_XenStorage-f60
 e4e9f-3b8a-0be7-07aa-59fdce05d4c3/VHD-35381293-f097-48e4-85cf-3382bc85446f:
failed reading short footer: -22 Dec 29 23:35:33 ad vhd-util:
libvhd::vhd_read_footer_at:
/dev/VG_XenStorage-f60e4e9f-3b8a-0be7-07aa-59fdce05d4c3/VHD-35381293-f097-48e4-85cf-3382bc85446f:
reading footer at 0x32197ffe00 failed: -22 Dec 29 23:35:33 ad vhd-util:
libvhd::vhd_read:
/dev/VG_XenStorage-f60e4e9f-3b8a-0be7-07aa-59fdce05d4c3/VHD-35381293-f097-48e4-85cf-3382bc85446f:
read of 512 returned 0, errno: -22 Dec 29 23:35:33 ad vhd-util:
libvhd::vhd_read_short_footer:
/dev/VG_XenStorage-f60e4e9f-3b8a-0be7-07aa-59fdce05d4c3/VHD-35381293-f097-48e4-85cf-3382bc85446f:
failed reading short footer: -22 Dec 29 23:35:35 ad tapdisk[15898]:
/dev/VG_XenStorage-f60e4e9f-3b8a-0be7-07aa-59fdce05d4c3/VHD-35381293-f097-48e4-85cf-3
 382bc85446f: b: 102400, a: 3158, f: 987, n: 12968880 Dec 29 23:35:35 ad
tapdisk[15898]: closed image
/dev/VG_XenStorage-f60e4e9f-3b8a-0be7-07aa-59fdce05d4c3/VHD-35381293-f097-48e4-85cf-3382bc85446f
(0 users, state: 0x00000000, type: 4) Dec 29 23:35:38 ad tapdisk[15898]:
/dev/VG_XenStorage-f60e4e9f-3b8a-0be7-07aa-59fdce05d4c3/VHD-35381293-f097-48e4-85cf-3382bc85446f
version: tap 0x00010003, b: 102400, a: 0, f: 0, n: 8455 Dec 29 23:35:38 ad
tapdisk[15898]: opened image
/dev/VG_XenStorage-f60e4e9f-3b8a-0be7-07aa-59fdce05d4c3/VHD-35381293-f097-48e4-85cf-3382bc85446f
(1 users, state: 0x00000001, type: 4) Dec 29 23:35:38 ad tapdisk[15898]:
/dev/VG_XenStorage-f60e4e9f-3b8a-0be7-07aa-59fdce05d4c3/VHD-35381293-f097-48e4-85cf-3382bc85446f:
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Xen users - Dec 2011 - XCP - corrupted VDI footer ?

XCP - corrupted VDI footer ?

Re: XCP - corrupted VDI footer ?