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Wednesday, November 14, 2012

Replacing a failed disk on Netapp

If the disk was not completely failed then we will be getting the below error message.

Disk Inventory Monitor: Dual Loop Configuration WARNING!!! The system has detected an inconsistency in the device maps of paired-channels listed below. Review the device maps of
both channels to check for disks which may not be responding on both A and B device ports.
channels: 0c and 0a.

In this case, you will want to find out what device is failing. Execute :

FBTFAS01> disk show

------- ----  --------- ---- ---------
0c.22    B    0a.22      A     1    6
0c.23    B    0a.23      A     1    7
0c.24    B    0a.24      A     1    8
0c.25    B    0a.25      A     1    9
0c.26    B    0a.26      A     1   10
0c.27    B    0a.27      A     1   11
0c.28    B    0a.28      A     1   12
0c.29    B    0a.29      A     1   13
0c.32    B                     2    0
0c.33    B    0a.33      A     2    1
0a.34    A    0c.34      B     2    2
0a.35    A    0c.35      B     2    3
0a.36    A    0c.36      B     2    4
0a.37    A    0c.37      B     2    5
0a.38    A    0c.38      B     2    6
0a.39    A    0c.39      B     2    7
0a.40    A    0c.40      B     2    8
0a.41    A    0c.41      B     2    9
Notice that disk 0c.32 is only showing up on one channel. That is the one that is causing the problem. Let’s fail the disk over to the spare:
FBTFAS01> disk replace start 0c.32 0d.29
The system will prompt you with the normal “are you sure” message, and, with the positive response, the system will begin the process of replacing the failing drive and rebuilding the contents on the new drive.

You can monitor the progress with “sysconfig -r”.

Once the reconstruction has completed, you will want to remove the drive. In order to help you properly identify the drive, you can have the RED LED blink on the drive in a consistent manner to make it obvious to the person who will be pulling the drive.
FBTFAS01> priv set advanced

FBTFAS01> blink_on 0c.32

FBTFAS01>  priv set admin
If the disk is completely broken and the LED won’t blink, just turn on the RED LED’s on either side of the bad disk. That way, the one in the middle (not blinking) is easy to find and replace.
Now that we are ready to replace the drive, execute:
FBTFAS01> disk swap
Pull the drive from the system and insert the new drive.
FBTFAS01> disk swap
And your new drive has been added to the system as a spare. Confirm this with ‘volstatus -r’ or ‘sysconfig -r’.

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