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mohammad_hantas
29 Posts
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710
November 17th, 2008 02:00
why names changes in Fstab file
When we reboot the server, we got error file System unknown, It mean from the OS can¿t mount all of EMC drives,
So the devices in the fstab file is not been mounted any more, except the local drives. And when we make it as comment in the fstab file the OS can Boot normally but with no EMC storage, and when we issue the command fdisk ¿l we got all physical drives name different from the drives names in the fstab file.
Example :-
/dev/sdr1 /u01 ext3 default 1 2
When we used command fdisk ¿l
We cannot find this drive ¿ /dev/sdr1¿
And we found another drives name.
So the devices in the fstab file is not been mounted any more, except the local drives. And when we make it as comment in the fstab file the OS can Boot normally but with no EMC storage, and when we issue the command fdisk ¿l we got all physical drives name different from the drives names in the fstab file.
Example :-
/dev/sdr1 /u01 ext3 default 1 2
When we used command fdisk ¿l
We cannot find this drive ¿ /dev/sdr1¿
And we found another drives name.
mohammad_hantas
29 Posts
291
0
Posted November 17th, 2008 06:00
hi
I use Powerpath , Linux , I just reboot , I check my devices they all are ok execpt three devices , I could not mount it , there is no logical name emcpowerad >> emcpowerad1
does that mean I lost my devices- 1)Linux smsc 2.6.18-53.el5 #1 SMP Sat Nov 10 19:37:22 EST 2007 x86_64 x86_64 x86_64 GNU/Linux
2) symmetrix 1000
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3)the fstab contains example :/dev/sda1 /u01
we change it to /dev/emcpowera1 /u01
will this step solve the problem ? - i see that you are on RHEL5 and why dont make use of LVM?
if /dev/sdr1 is mentioned in fstab that is a partion rather than disk. fdisk should work on /dev/sdr.
If any chance your device file /dev/sdxx or emcpowerx changed then with LVM you can sustain that or you should have a LABEL to each partition.
The one logic to identify the old and the new device is look at the old " powermt display dev=all" output you have and look for Logical device ID. This ID always remains constant.
Or try to make out which LUN was used and look at " powermt display dev=all" to get the new /dev/sdxx or emcpowerx .
dynamox
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Posted November 17th, 2008 05:00