[dm-devel] Stopped disk causes LVM to go crazy

[Alireza Nematollahi]

hi. Thanks for your reply. Well, I had tried that before, but no luck. I tried it again, and still no luck: 
> vgchange -an disk2 
0 logical volume(s) in volume group "disk2" now active 
> sdparm -C stop /dev/sdb 
> lvscan 
end_request: I/O error, dev sdb, sector 0 
printk: 72 messages suppressed. 
Buffer I/O error on device sdb, logical block 0 
Buffer I/O error on device sdb, logical block 1 
Buffer I/O error on device sdb, logical block 2 
Buffer I/O error on device sdb, logical block 3 
end_request: I/O error, dev sdb, sector 0 
Buffer I/O error on device sdb, logical block 0 
end_request: I/O error, dev sdb, sector 287277824 
/dev/sdb: read failed after 0 of 4096 at 0: Input/output error 
end_request: I/O error, dev sdb, sector 0 
/dev/sdb: read failed after 0 of 4096 at 147086245888: Input/oend_request: I/O error, dev sdb, sector 287274137 
utput error 
/dev/sdb: read failed after 0 of 4096 at 0: Inputend_request: I/O error, dev sdb, sector 287258265 
/output error 
/dev/sdb1: read failed after 0 of 512 at 812646end_request: I/O error, dev sdb, sector 287258029 
4: Input/output error 
/dev/sdb1: read failed after 0 of 2048 end_request: I/O error, dev sdb, sector 281410605 
at 0: Input/output error 
/dev/sdb2: read failed after 0 of 20end_request: I/O error, dev sdb, sector 281410367 
48 at 2993881088: Input/output error 
/dev/sdb2: read failed aend_request: I/O error, dev sdb, sector 63 
fter 0 of 2048 at 0: Input/output error 
/dev/sdb4: read failed after 0 of 1024 at 144082075648: Input/output error 
/dev/sdb4: read failed after 0 of 2048 at 0: Input/output error 
ACTIVE '/dev/disk1/blah' [10.00 GB] inherit 
ACTIVE '/dev/disk1/blah' [100.00 MB] inherit 
ACTIVE '/dev/disk1/blah' [10.00 GB] inherit 
ACTIVE '/dev/disk1/blah' [100.00 MB] inherit 
ACTIVE '/dev/disk1/blah' [10.00 GB] inherit 
ACTIVE '/dev/disk1/blah' [100.00 MB] inherit 

I'm using older LVM version: 
> lvscan --version 
LVM version: 2.02.25 (2007-04 27) 
Library version: 1.02.19 (2007-04-27) 
Driver version: 4.11.0 

Any ideas? 

Thanks 

----- Original Message ----- 
From: "Bryn M. Reeves" <bmr at redhat.com> 
To: "device-mapper development" <dm-devel at redhat.com> 
Sent: Wednesday, February 11, 2009 2:39:20 AM GMT -08:00 US/Canada Pacific 
Subject: Re: [dm-devel] Stopped disk causes LVM to go crazy 

Alireza Nematollahi wrote: 
> hi guys, 
> 
> I have a system with two SATA disks and I have LVM on the disks. I 
> use sdparm (sdparm -C stop /dev/sdb) to spin-down one of them. It 
> works fine and I can hear the disk spinning down and all...But when 
> I run any LVM command, say lvscan or whatever, I get lots of error 
> messages: 

What did you expect? :) 

If the volume group is active when you remove/spin down the disks LVM 
has no way of knowing that you wanted to do that. To the software, it 
just looks like a drive has failed or gone away while it was in use. 

<snip> 

> /dev/sdb2: read failed after 0 of 4096 at 2993881088: Input/output 
> error /dev/sdb2: read failed after 0 of 4096 at 0: Input/output 
> error /dev/sdb4: read failed after 0 of 1024 at 144082075648: 
> Input/output error /dev/sdb4: read failed after 0 of 2048 at 0: 

> Input/output error Even when I physically remove the disk it still 
> happens. Is there any way I can stop LVM from querying both disks 
> or at least to stop displaying the error messages? 

Tell LVM to stop using the disk first. See the man page for vgchange 
for full details but you want to run: 

vgchange -an <volume group> 

To deactivate the volume group *before* you start removing devices 
that it is using. 

Regards, 
Bryn. 

-- 
dm-devel mailing list 
dm-devel at redhat.com 
https://www.redhat.com/mailman/listinfo/dm-devel 
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://listman.redhat.com/archives/dm-devel/attachments/20090211/6253c0be/attachment.htm>