How can disk label get lost?

[Matt Iavarone]

On Thu, Feb 4, 2010 at 12:07 PM, Yong Huang <yong321 at yahoo.com> wrote:
> $ cat /etc/redhat-release
> Red Hat Enterprise Linux Server release 5.2 (Tikanga)
> $ uname -a
> Linux xxxxx 2.6.18-92.1.13.el5 #1 SMP Thu Sep 4 03:51:21 EDT 2008 x86_64 x86_64 x86_64 GNU/Linux
>
> Once in a while, blkid command shows missing LABEL for my device mapper disks VOL3 and VOL4:
>
> $ blkid
> ...
> /dev/mapper/asmvol2p1: LABEL="VOL2" TYPE="oracleasm"
> /dev/mapper/asmvol1p1: LABEL="VOL1" TYPE="oracleasm"
> /dev/sdp1: LABEL="VOL2" TYPE="oracleasm"
> /dev/sdg1: LABEL="" TYPE="oracleasm"
> /dev/sdf1: LABEL="" TYPE="oracleasm"
> /dev/sdb1: LABEL="VOL2" TYPE="oracleasm"
> /dev/sda1: LABEL="VOL1" TYPE="oracleasm"
> /dev/mapper/asmvol3p1: LABEL="" TYPE="oracleasm"
> /dev/mapper/asmvol4p1: LABEL="" TYPE="oracleasm"
> /dev/sdh1: LABEL="VOL1" TYPE="oracleasm"
> /dev/sdi1: LABEL="VOL2" TYPE="oracleasm"
> /dev/sdm1: LABEL="" TYPE="oracleasm"
> /dev/sdn1: LABEL="" TYPE="oracleasm"
> /dev/sdo1: LABEL="VOL1" TYPE="oracleasm"
> /dev/sdt1: LABEL="" TYPE="oracleasm"
> /dev/sdu1: LABEL="" TYPE="oracleasm"
> /dev/sdv1: LABEL="VOL1" TYPE="oracleasm"
> /dev/sdw1: LABEL="VOL2" TYPE="oracleasm"
> /dev/sdaa1: LABEL="" TYPE="oracleasm"
> /dev/sdab1: LABEL="" TYPE="oracleasm"
>
> Later blkid shows all labels correctly, without us doing anything.
>
> $ blkid | egrep 'VOL3|VOL4'
> /dev/sdg1: LABEL="VOL4" TYPE="oracleasm"
> /dev/sdf1: LABEL="VOL3" TYPE="oracleasm"
> /dev/mapper/asmvol3p1: LABEL="VOL3" TYPE="oracleasm"
> /dev/mapper/asmvol4p1: LABEL="VOL4" TYPE="oracleasm"
> /dev/sdm1: LABEL="VOL3" TYPE="oracleasm"
> /dev/sdn1: LABEL="VOL4" TYPE="oracleasm"
> /dev/sdt1: LABEL="VOL3" TYPE="oracleasm"
> /dev/sdu1: LABEL="VOL4" TYPE="oracleasm"
> /dev/sdaa1: LABEL="VOL3" TYPE="oracleasm"
> /dev/sdab1: LABEL="VOL4" TYPE="oracleasm"
>
> There's nothing in /var/log/messages. No cron job I know of that touches disk headers. What can be done to troubleshoot?
>
> Oracle continues to function correctly, probably because once the database is up, the label is no longer needed, till the next database restart.
>
> Yong Huang
>
>
>
>
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Have you checked active paths when the label is empty?  What does
'service oracleasm listdisks' show when the label is missing?