[Linux-PowerEdge] internal disks on raid controller and linux

JHurley at SummitRacing.com JHurley at SummitRacing.com
Tue Nov 27 06:35:36 CST 2012


We have a set of new Dell servers R710's each with 6 internal disks.
Using 2 raid 1 mirrors and two hot spares.  EMC storage from VNX with
powerpath also defined.  Oracle Linux OL 6.2 ( clone of redhat )
installed on first raid 1 mirror and all 3rd party software.  Also going
to use Acronis to get OS backups and have bare metal restore capability.

 

Usually my OS comes up on /dev/sda ... ( so /boot on /dev/sda1 and my
root directory on /dev/sda2 etc ).

 

Sometimes though it comes up on different device ... and for various
reasons the Acronis backup/recovery will only work completely when it
sees disk 1 on /dev/sda ... the /etc/fstab is using UUID so systems will
boot up and run either way.

 

What is going on here?  Something from internal raid controller and when
linux sees the device being timing dependent?  I really need to get it
consistent because of the Acronis stuff.

 

Considering trying to force with udev rule but ... not sure how to
proceed here exactly ( Oracle DBA not linux sys admin here ).

 

Some of most recent boots ( excerpted lines ) show this kind of pattern
( from /var/log/messages ).  Most recent one from yesterday now has
/boot on /dev/sdi1 

 

(6869): Nov 26 17:07:58 westo-02 kernel: sd 0:2:1:0: [sdb] 1170997248
512-byte logical blocks: (599 GB/558 GiB)

(6870): Nov 26 17:07:58 westo-02 kernel: sd 0:2:0:0: [sda] 1170997248
512-byte logical blocks: (599 GB/558 GiB)

(8093): Nov 26 17:31:01 westo-02 kernel: sd 2:2:0:0: [sdi] 1170997248
512-byte logical blocks: (599 GB/558 GiB)

(8094): Nov 26 17:31:01 westo-02 kernel: sd 2:2:1:0: [sdj] 1170997248
512-byte logical blocks: (599 GB/558 GiB)

(9312): Nov 26 17:44:33 westo-02 kernel: sd 0:2:0:0: [sda] 1170997248
512-byte logical blocks: (599 GB/558 GiB)

(9313): Nov 26 17:44:33 westo-02 kernel: sd 0:2:1:0: [sdb] 1170997248
512-byte logical blocks: (599 GB/558 GiB)

(10528): Nov 26 17:55:14 westo-02 kernel: sd 0:2:1:0: [sdb] 1170997248
512-byte logical blocks: (599 GB/558 GiB)

(10529): Nov 26 17:55:14 westo-02 kernel: sd 0:2:0:0: [sda] 1170997248
512-byte logical blocks: (599 GB/558 GiB)

(11732): Nov 26 18:00:56 westo-02 kernel: sd 0:2:0:0: [sda] 1170997248
512-byte logical blocks: (599 GB/558 GiB)

(11733): Nov 26 18:00:56 westo-02 kernel: sd 0:2:1:0: [sdb] 1170997248
512-byte logical blocks: (599 GB/558 GiB)

(12946): Nov 26 18:06:18 westo-02 kernel: sd 2:2:0:0: [sdi] 1170997248
512-byte logical blocks: (599 GB/558 GiB)

(12950): Nov 26 18:06:18 westo-02 kernel: sd 2:2:1:0: [sdj] 1170997248
512-byte logical blocks: (599 GB/558 GiB)

 


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