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

Gaash Hazan gaash at qwilt.com
Tue Nov 27 10:25:34 CST 2012


This sometimes happens if you have SD or iDRAC virtual disk is enabled.
Try 'blkid' and dig into '/sys/block/sda' to figure out what kind of device
sda is.


Gaash Hazan
Qwilt | M +972.54.4575.232 | gaash at qwilt.com


On Tue, Nov 27, 2012 at 2:35 PM, <JHurley at summitracing.com> wrote:

> 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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