[linux-lvm] I/O error

[linux-lvm] I/O error

[German Staltari]

Hi, we have an IBM server attached to an IBM SAN with a qlogic HBA. When 
I run 'lvdisplay' or any other 'Xdisplay' (vg, pv) command this is the 
output:

  /dev/sdq: read failed after 0 of 4096 at 0: Input/output error
  /dev/sdb: read failed after 0 of 4096 at 0: Input/output error
  /dev/sds: read failed after 0 of 4096 at 0: Input/output error
  /dev/sdd: read failed after 0 of 4096 at 0: Input/output error
  /dev/sdt: read failed after 0 of 4096 at 0: Input/output error
  Found duplicate PV DYM8ElmyYadLJeAJk5TfxMx7pprrFHfk: using /dev/sdu 
not /dev/sdc
  /dev/sdf: read failed after 0 of 4096 at 0: Input/output error
  /dev/sdv: read failed after 0 of 4096 at 0: Input/output error
  Found duplicate PV Qoe4208RQKg0XK1AfXjInMLglzU8ks6v: using /dev/sdw 
not /dev/sde
  /dev/sdh: read failed after 0 of 4096 at 0: Input/output error
  /dev/sdx: read failed after 0 of 4096 at 0: Input/output error
  Found duplicate PV n3IC77zXPw0QQ6OcfldMfpKPRG3QsxXW: using /dev/sdy 
not /dev/sdi
  Found duplicate PV EX7OrzfwKADyFhnnlooYEKtvL9t5Gv3W: using /dev/sdj 
not /dev/sdg
  /dev/sdk: read failed after 0 of 4096 at 0: Input/output error
  /dev/sdm: read failed after 0 of 4096 at 0: Input/output error
  Found duplicate PV ftppICdxAujdcPH0eZ77TBWD6waiOckd: using /dev/sdn 
not /dev/sdl
  Found duplicate PV OuTEiF4W1rYuVGOTEcKQQmrDnDkpyATT: using /dev/sdp 
not /dev/sdr
------------------------------ cut -----------------------------------------

The Storage Admin told me that there are two path to the same storage 
(disk). I would like to know if this is an error to be worried about or 
is just info? And if there's a way to avoid this output. Also, when a I 
run 'dmesg', I have this output (if I clear with 'dmesg -c', it will 
appear again in the next minutes):

Buffer I/O error on device sdk, logical block 0
end_request: I/O error, dev sdk, sector 0
Buffer I/O error on device sdk, logical block 0
end_request: I/O error, dev sdm, sector 0
end_request: I/O error, dev sdm, sector 0
printk: 1 messages suppressed.
Buffer I/O error on device sdm, logical block 0
end_request: I/O error, dev sdq, sector 0
end_request: I/O error, dev sdq, sector 0
end_request: I/O error, dev sds, sector 0

FC4
kernel-smp-2.6.15-1.1831_FC4
  LVM version:     2.01.08 (2005-03-22)
  Library version: 1.01.02 (2005-05-17)
  Driver version:  4.4.0
Fibre Channel: QLogic Corp. QLA2312 Fibre Channel Adapter (rev 02)

Thanks
German Staltari

Re: [linux-lvm] I/O error

[Nate Carlson]

On Mon, 13 Mar 2006, German Staltari wrote:
> The Storage Admin told me that there are two path to the same storage 
> (disk). I would like to know if this is an error to be worried about or 
> is just info? And if there's a way to avoid this output. Also, when a I 
> run 'dmesg', I have this output (if I clear with 'dmesg -c', it will 
> appear again in the next minutes):

You might want to download QLogic's drivers for the card, and build them 
with multipath support.. then you'll only see the drives once, and it 
should hopefully clear out these errors for you.

(The multipath driver used to be included in the qlogic drivers in the 
kernel, but were removed for some reason I Don't recall..)

------------------------------------------------------------------------
| nate carlson | natecars@natecarlson.com | http://www.natecarlson.com |
|       depriving some poor village of its idiot since 1981            |
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Re: [linux-lvm] I/O error

[Luca Berra]

On Mon, Mar 13, 2006 at 09:57:27AM -0600, Nate Carlson wrote:
>You might want to download QLogic's drivers for the card, and build them 
>with multipath support.. then you'll only see the drives once, and it 
>should hopefully clear out these errors for you.
>
>(The multipath driver used to be included in the qlogic drivers in the 
>kernel, but were removed for some reason I Don't recall..)
probably because multipath-tools is a cleaner solution?

L.

-- 
Luca Berra -- bluca@comedia.it
        Communication Media & Services S.r.l.
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Re: [linux-lvm] I/O error

[Nate Carlson]

On Tue, 14 Mar 2006, Luca Berra wrote:
> probably because multipath-tools is a cleaner solution?

Hmm.. hadn't run into this one before; looked over the docs.. looks 
interesting, and very flexible, but also a heck of a lot more complicated. 
:)

------------------------------------------------------------------------
| nate carlson | natecars@natecarlson.com | http://www.natecarlson.com |
|       depriving some poor village of its idiot since 1981            |
------------------------------------------------------------------------