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Re: [Xen-users] DomU 2TB vbd limit?

Joris Dobbelsteen írta:
>> -----Original Message-----
>> From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx 
>> [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Gémes Géza
>> Sent: Monday, 26 November 2007 22:25
>> To: xen-users@xxxxxxxxxxxxxxxxxxx
>> Subject: [Xen-users] DomU 2TB vbd limit?
>> Hi everyone,
>> Just a quick question:
>> Is there a limit on the vbd size for pv guest domains, I've 
>> found only rumors on the Internet about a 2TB limit, but from 
>> my experience with
>> xen-3.0.3 /linux-kernel-2.6.18-5 (installed from a debian etch 
>> packages) I can say that a lvm volume of 3.7TB as created and 
>> formated in Dom0 is seen as 1.85TB only of course reporting a 
>> corrupted xfs filesystem ending after the end of the device. 
>> If there is any xen/kernel version where this limitation 
>> disappears please tell me.
> This might seem useful:
> <http://lists.opensuse.org/opensuse-factory/2007-03/msg00327.html>
> Short version: might be a partition table problem. MS-DOS MFT is limited to 2 
> TB. Try GPT instead.
> - Joris
Unfortunately that is not the problem, there is absolutely no partition
table et all. The storage is an aoe lblade vith an lvm volume group on
top of it. On lvm there are a few smaller perfectly working xfs formated
logical volumes and (currently) one bigger (3.7TB) which is working
perfectly on Dom0 both as a logical volume and as a filesystem. However
when I give that logical volume as a physical disk to a DomU that starts
to balk to me about:
attempt to access beyond end of device
hda3: rw=0, want=8283750400, limit=3988783104
I/O error in filesystem ("hda3") meta-data dev hda3 block
0x1edbfffff       ("xfs_read_buf") error 5 buf count 512
XFS: size check 2 failed
from my computations I've found that the DomU is "seeing" 1.85TB from
the logical volume it was given.


Geza Gemes

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