Extending Virtual Disk and LVM online.

John Hill hill at hep.phy.cam.ac.uk
Thu Jun 26 09:03:08 CDT 2008


"Degraded" means that your firmware needs upgrading. Note in the output:

Firmware Version                  : 521S
Minimum Required Firmware Version : 522D

The latest firmware available for the PERC 4e/Di is 5A2D.

John

Ray Van Dolson wrote:
> Hi all, got a PE2850 with a PERC 4e/Di.  We had three 174GB disks in
> the system configured in a single RAID5 virtual disk (/dev/sda to the
> OS).  I added three more of these disks and wanted to extend the
> existing Virtual Disk.
> 
> I should note this system is running RHEL ES 4.6...
> 
> It was simple to do this via the "Reconfigure" Virtual Disk Wizard.
> Everything seemed to work fine after a long rebuild process and I now
> see the following:
> 
> # omreport storage vdisk
> List of Virtual Disks in the System
> 
> Controller PERC 4e/Di (Embedded)
> ID                  : 0
> Status              : Ok
> Name                : Virtual Disk 0
> State               : Ready
> Progress            : Not Applicable
> Layout              : RAID-5
> Size                : 683.11 GB (733478912000 bytes)
> Device Name         : /dev/sda
> Type                : SCSI
> Read Policy         : Adaptive Read Ahead
> Write Policy        : Write Back
> Cache Policy        : Direct I/O
> Stripe Element Size : 64 KB
> Disk Cache Policy   : 
> 
> The size looks correct.  I do notice this...
> 
> # omreport storage controller
>  Controller  PERC 4e/Di (Embedded)
> 
> Controllers
> ID                                : 0
> Status                            : Non-Critical
> Name                              : PERC 4e/Di
> Slot ID                           : Embedded
> State                             : Degraded
> Firmware Version                  : 521S
> Minimum Required Firmware Version : 522D
> Driver Version                    : Not Applicable
> Minimum Required Driver Version   : Not Applicable
> Number of Connectors              : 2
> Rebuild Rate                      : 30%
> BGI Rate                          : Not Applicable
> Check Consistency Rate            : Not Applicable
> Reconstruct Rate                  : Not Applicable
> Alarm State                       : Not Applicable
> Cluster Mode                      : Not Applicable
> SCSI Initiator ID                 : 7
> Cache Memory Size                 : 256 MB
> Patrol Read Mode                  : Auto
> Patrol Read State                 : Active
> Patrol Read Rate                  : Not Applicable
> Patrol Read Iterations            : 4722
> 
> Not sure why the state is "Degraded" -- all of the physical disks
> appear to be fine.
> 
> In any case, fdisk still shows that /dev/sda is the original 293.3GB.
> Hmm, probably need to rescan the SCSI bus?
> 
> # echo 1 > /sys/bus/scsi/drivers/sd/0\:2\:0\:0/rescan
> # echo 1 > /sys/bus/scsi/drivers/sd/0:2:0:0/block/device/rescan
> # dmesg
> SCSI device sda: 1432576000 512-byte hdwr sectors (733479 MB)
> sda: asking for cache data failed
> sda: assuming drive cache: write through
> SCSI device sda: 1432576000 512-byte hdwr sectors (733479 MB)
> sda: asking for cache data failed
> sda: assuming drive cache: write through
> 
> So it seems like the OS has detected the new array size, but fdisk
> still does not:
> 
> # fdisk -l /dev/sda
> 
> Disk /dev/sda: 293.3 GB, 293391564800 bytes
> 255 heads, 63 sectors/track, 35669 cylinders
> Units = cylinders of 16065 * 512 = 8225280 bytes
> 
>    Device Boot      Start         End      Blocks   Id  System
> /dev/sda1   *           1          13      104391   83  Linux
> /dev/sda2              14       12761   102398310   8e  Linux LVM
> /dev/sda3           12762       25509   102398310   8e  Linux LVM
> /dev/sda4           25510       35669    81610200    5  Extended
> /dev/sda5           25510       27421    15358108+  83  Linux
> /dev/sda6           27422       27943     4192933+  82  Linux swap
> /dev/sda7           27944       35669    62059063+  83  Linux
> 
> Is there something I am missing?  Maybe I just need to reboot. :(
> 
> Oh, and for posterity's sake, here's /proc/scsi/scsi:
> 
> # cat /proc/scsi/scsi 
> Attached devices:
> Host: scsi0 Channel: 00 Id: 06 Lun: 00
>   Vendor: PE/PV    Model: 1x6 SCSI BP      Rev: 1.0 
>   Type:   Processor                        ANSI SCSI revision: 02
> Host: scsi0 Channel: 02 Id: 00 Lun: 00
>   Vendor: MegaRAID Model: LD 0 RAID5  279G Rev: 521S
>   Type:   Direct-Access                    ANSI SCSI revision: 02
> 
> Thanks!
> Ray
> 
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