[rhelv6-list] RHEL6 booting issue with SAN
Amrish Parikh
amrish.parikh at gmail.com
Fri May 13 09:42:02 UTC 2011
Hi,
I am facing very weird issue on RHEL6 when SAN cable/Luns are attached.
Below is the issue summary:
1. I have installed RHEL6 OS (when SAN cable was not attached to the
system) with desktop option, system has 4 internal disks.
a. While OS installation internal disks was showing as sdb, sdc, sdd and
sde and I installed root, boot and swap on sdb
b. After OS installation done which went up and running properly. But,
now, my disk labeling changed to sda, sdb, sdc and sdd.
*(some commands I fired on that live server are below)*
[root at rh12 /]# *df -h*
Filesystem Size Used Avail Use% Mounted on
/dev/md1 29G 3.3G 25G 12% /
tmpfs 499M 100K 499M 1% /dev/shm
/dev/sda1 2.0G 68M 1.8G 4% /boot
[root at rh12 /]# *fdisk -l*
Disk /dev/sda: 160.0 GB, 160041885696 bytes
255 heads, 63 sectors/track, 19457 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0xe008fd5e
Device Boot Start End Blocks Id System
/dev/sda1 * 1 256 2048000 83 Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2 256 4080 30720000 fd Linux raid
autodetect
/dev/sda3 4080 4717 5120000 82 Linux swap / Solaris
Disk /dev/sdb: 160.0 GB, 160041885696 bytes
255 heads, 63 sectors/track, 19457 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x0006cc86
Device Boot Start End Blocks Id System
/dev/sdb1 1 3825 30720000 fd Linux raid
autodetect
Disk /dev/sdc: 160.0 GB, 160041885696 bytes
255 heads, 63 sectors/track, 19457 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Disk /dev/sdc doesn't contain a valid partition table
Disk /dev/sdd: 160.0 GB, 160041885696 bytes
255 heads, 63 sectors/track, 19457 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Disk /dev/sdd doesn't contain a valid partition table
Disk /dev/md1: 31.5 GB, 31456157696 bytes
2 heads, 4 sectors/track, 7679726 cylinders
Units = cylinders of 8 * 512 = 4096 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Disk /dev/md1 doesn't contain a valid partition table
[root at rh12 /]# *cat /proc/scsi/scsi*
Attached devices:
Host: scsi4 Channel: 00 Id: 00 Lun: 00
Vendor: ATA Model: GB0160CAABV Rev: n/a
Type: Direct-Access ANSI SCSI revision: 05
Host: scsi4 Channel: 00 Id: 01 Lun: 00
Vendor: ATA Model: GB0160CAABV Rev: n/a
Type: Direct-Access ANSI SCSI revision: 05
Host: scsi5 Channel: 00 Id: 00 Lun: 00
Vendor: ATA Model: GB0160CAABV Rev: n/a
Type: Direct-Access ANSI SCSI revision: 05
Host: scsi5 Channel: 00 Id: 01 Lun: 00
Vendor: ATA Model: GB0160CAABV Rev: n/a
Type: Direct-Access ANSI SCSI revision: 05
Host: scsi6 Channel: 00 Id: 00 Lun: 00
Vendor: HL-DT-ST Model: DVDRAM GSA-E10L Rev: LE05
Type: CD-ROM ANSI SCSI revision: 00
Host: scsi7 Channel: 00 Id: 00 Lun: 00
Vendor: KVM Model: vmDisk-CD Rev: 0.01
Type: CD-ROM ANSI SCSI revision: 00
Host: scsi8 Channel: 00 Id: 00 Lun: 00
Vendor: KVM Model: vmDisk Rev: 0.01
Type: Direct-Access ANSI SCSI revision: 00
[root at rh12 /]#
c. I rebooted the system several times but getting the same results.. no
worries as system was working properly. No issues.
2. Now, I attached SAN cable and SAN luns to the system when system was
live i.e. when it was up and running, then I fired some commands as below
*(After SAN cables+Luns attached to live system but before reboot)*
* *
*[root at rh12 ~]# cat /proc/scsi/scsi *
Attached devices:
Host: scsi4 Channel: 00 Id: 00 Lun: 00
Vendor: ATA Model: GB0160CAABV Rev: n/a
Type: Direct-Access ANSI SCSI revision: 05
Host: scsi4 Channel: 00 Id: 01 Lun: 00
Vendor: ATA Model: GB0160CAABV Rev: n/a
Type: Direct-Access ANSI SCSI revision: 05
Host: scsi5 Channel: 00 Id: 00 Lun: 00
Vendor: ATA Model: GB0160CAABV Rev: n/a
Type: Direct-Access ANSI SCSI revision: 05
Host: scsi5 Channel: 00 Id: 01 Lun: 00
Vendor: ATA Model: GB0160CAABV Rev: n/a
Type: Direct-Access ANSI SCSI revision: 05
Host: scsi6 Channel: 00 Id: 00 Lun: 00
Vendor: HL-DT-ST Model: DVDRAM GSA-E10L Rev: LE05
Type: CD-ROM ANSI SCSI revision: 00
Host: scsi7 Channel: 00 Id: 00 Lun: 00
Vendor: KVM Model: vmDisk-CD Rev: 0.01
Type: CD-ROM ANSI SCSI revision: 00
Host: scsi8 Channel: 00 Id: 00 Lun: 00
Vendor: KVM Model: vmDisk Rev: 0.01
Type: Direct-Access ANSI SCSI revision: 00
*Host: scsi0 Channel: 00 Id: 00 Lun: 00*
* Vendor: DGC Model: LUNZ Rev: 0219*
* Type: Direct-Access ANSI SCSI revision: 04*
*Host: scsi0 Channel: 00 Id: 01 Lun: 00*
* Vendor: DGC Model: RAID 5 Rev: 0220*
* Type: Direct-Access ANSI SCSI revision: 04*
*Host: scsi0 Channel: 00 Id: 01 Lun: 01*
* Vendor: DGC Model: RAID 5 Rev: 0220*
* Type: Direct-Access ANSI SCSI revision: 04*
*Host: scsi0 Channel: 00 Id: 01 Lun: 02*
* Vendor: DGC Model: RAID 5 Rev: 0220*
* Type: Direct-Access ANSI SCSI revision: 04***
[root at rh12 ~]#
*[root at rh12 ~]# fdisk -l*
Disk /dev/sdc: 160.0 GB, 160041885696 bytes
255 heads, 63 sectors/track, 19457 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Disk /dev/sdc doesn't contain a valid partition table
Disk /dev/sda: 160.0 GB, 160041885696 bytes
255 heads, 63 sectors/track, 19457 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0xe008fd5e
Device Boot Start End Blocks Id System
/dev/sda1 * 1 256 2048000 83 Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2 256 4080 30720000 fd Linux raid
autodetect
/dev/sda3 4080 4717 5120000 82 Linux swap / Solaris
Disk /dev/sdb: 160.0 GB, 160041885696 bytes
255 heads, 63 sectors/track, 19457 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x0006cc86
Device Boot Start End Blocks Id System
/dev/sdb1 1 3825 30720000 fd Linux raid
autodetect
Disk /dev/sdd: 160.0 GB, 160041885696 bytes
255 heads, 63 sectors/track, 19457 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Disk /dev/sdd doesn't contain a valid partition table
Disk /dev/md1: 31.5 GB, 31456157696 bytes
2 heads, 4 sectors/track, 7679726 cylinders
Units = cylinders of 8 * 512 = 4096 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Disk /dev/md1 doesn't contain a valid partition table
Disk /dev/sdg: 16.1 GB, 16106127360 bytes
64 heads, 32 sectors/track, 15360 cylinders
Units = cylinders of 2048 * 512 = 1048576 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Disk /dev/sdg doesn't contain a valid partition table
Disk /dev/sdh: 16.1 GB, 16106127360 bytes
64 heads, 32 sectors/track, 15360 cylinders
Units = cylinders of 2048 * 512 = 1048576 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Disk /dev/sdh doesn't contain a valid partition table
Disk /dev/sdi: 16.1 GB, 16106127360 bytes
64 heads, 32 sectors/track, 15360 cylinders
Units = cylinders of 2048 * 512 = 1048576 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Disk /dev/sdi doesn't contain a valid partition table
*[root at rh12 ~]# cat /proc/partitions *
major minor #blocks name
8 32 156290904 sdc
8 0 156290904 sda
8 1 2048000 sda1
8 2 30720000 sda2
8 3 5120000 sda3
8 16 156290904 sdb
8 17 30720000 sdb1
8 48 156290904 sdd
9 1 30718904 md1
8 96 15728640 sdg
8 112 15728640 sdh
8 128 15728640 sdi
*[root at rh12 ~]# lsscsi *
[0:0:0:0] disk DGC LUNZ 0219 /dev/sdf
[0:0:1:0] disk DGC RAID 5 0220 /dev/sdg
[0:0:1:1] disk DGC RAID 5 0220 /dev/sdh
[0:0:1:2] disk DGC RAID 5 0220 /dev/sdi
[4:0:0:0] disk ATA GB0160CAABV n/a /dev/sda
[4:0:1:0] disk ATA GB0160CAABV n/a /dev/sdb
[5:0:0:0] disk ATA GB0160CAABV n/a /dev/sdc
[5:0:1:0] disk ATA GB0160CAABV n/a /dev/sdd
[6:0:0:0] cd/dvd HL-DT-ST DVDRAM GSA-E10L LE05 /dev/sr0
[7:0:0:0] cd/dvd KVM vmDisk-CD 0.01 /dev/sr1
[8:0:0:0] disk KVM vmDisk 0.01 /dev/sde
3. Then, I rebooted the system and for my surprise, it was not booting up
and throwing error message “No root device found, Boot has failed, sleeping
forever”
a. Reason i guess is that, system tries to boot from SAN disk instead of
internal disk and fails to boot
b. I have checked in the BIOS setting that first boot priority is set to
Internal disk and not SAN disk.
4. When I removed the SAN cable from the system, it again boots up
properly. No issues found.
Can anyone let me know the solutions for that and any reason why this is
happening?
Thanks in Advance!!!!
*Thanks,*
*Amrish Parikh*
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