[linux-lvm] filesystem errors

[linux-lvm] filesystem errors

[Dimitris Zilaskos]

 Hello ,
 I have setup an lvm consisted of 10 loopback attached files which are
exported with samba from windows2000 workstations . Occasionaly , during
write operations i get messages like the following


EXT2-fs error (device lvm(58,0)): read_inode_bitmap: Cannot read inode
bitmap - block_group = 1521, inode_bitmap = 49840129
EXT2-fs error (device lvm(58,0)): read_block_bitmap: Cannot read block
bitmap - block_group = 1521, block_bitmap = 49840128

after that i must perform a umount and filesystem check which finds and
fixes some errors . Data is usually only slightly damaged .  Read operations
work fine no matter how intensive they are .

On kernel 2.4.16 , there were no such errors but there were oopses , again
during write operations . From 2.4.17 to the 2.4.18-ac1 i am using now ,
the ext2 errors showed up .  The lvm tools version is 1.0.3 . All kernels
are smp .
 I did several huge transfers between the workstations and the linux box ,
as well as pings with big packets to make sure the networking is ok , and
it seems to be . No packetloss with 65000 bytes packets ,no suspicious
delays . I really want to track this problem down . Any help is
appreciated .

 Kind regards

--
=============================================================================

Dimitris Zilaskos

Department of Physics @ Aristotle Univercity of Thessaloniki , Greece
=============================================================================

Re: [linux-lvm] filesystem errors

[Heinz J . Mauelshagen]

On Fri, Mar 01, 2002 at 03:56:04PM +0200, Dimitris Zilaskos wrote:
> 
>  Hello ,
>  I have setup an lvm consisted of 10 loopback attached files which are
> exported with samba from windows2000 workstations . Occasionaly , during
> write operations i get messages like the following
> 
> 
> EXT2-fs error (device lvm(58,0)): read_inode_bitmap: Cannot read inode
> bitmap - block_group = 1521, inode_bitmap = 49840129
> EXT2-fs error (device lvm(58,0)): read_block_bitmap: Cannot read block
> bitmap - block_group = 1521, block_bitmap = 49840128
> 
> after that i must perform a umount and filesystem check which finds and
> fixes some errors . Data is usually only slightly damaged .  Read operations
> work fine no matter how intensive they are .
> 
> On kernel 2.4.16 , there were no such errors but there were oopses , again
> during write operations . From 2.4.17 to the 2.4.18-ac1 i am using now ,
> the ext2 errors showed up .  The lvm tools version is 1.0.3 . All kernels
> are smp .
>  I did several huge transfers between the workstations and the linux box ,
> as well as pings with big packets to make sure the networking is ok , and
> it seems to be . No packetloss with 65000 bytes packets ,no suspicious
> delays . I really want to track this problem down . Any help is
> appreciated .

Because you mention *huge* transfers the usual suspect is the VM subsystem IMO.
Did you try 2.4.<10 which didn't have the faulty VM subsystem?


> 
>  Kind regards
> 
> --
> =============================================================================
> 
> Dimitris Zilaskos
> 
> Department of Physics @ Aristotle Univercity of Thessaloniki , Greece
> =============================================================================
> 
> 
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-- 

Regards,
Heinz    -- The LVM Guy --

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    Nevertheless it needs not so stupid people to solve them ***

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Re: [linux-lvm] filesystem errors

[Dimitris Zilaskos]

> Because you mention *huge* transfers the usual suspect is the VM subsystem IMO.
> Did you try 2.4.<10 which didn't have the faulty VM subsystem?

 I havent used this kind of setup before kernel 2.4.16 . Nevertheless , I
did some more extensive tests on non-lvmed loopback filesystems and
errors occur there too , so you propably have a point . However, going
back to 2.4.<10 might have other implications in my setup :) . I will try
it on a spare box though .

Kind regards ,


=============================================================================

Dimitris Zilaskos

Department of Physics @ Aristotle Univercity of Thessaloniki , Greece
=============================================================================