ILRI Research Computing

We have two RAIDs on the HPC

• Linux kernel software RAID
• 3mware hardware RAID

It is currently reporting a degraded array (27 Aug 2009):

#cat /proc/mdstat
Personalities : [raid0] [raid1] 
md1 : active raid1 hda1[0]
      129920 blocks [2/1] [U_]
      
md3 : active raid1 hdc3[1] hda3[0]
      2097024 blocks [2/2] [UU]
      
md2 : active raid1 hdc5[1]
      65437696 blocks [2/1] [_U]
      
md0 : active raid0 hdc2[1] hda2[0]
      20971008 blocks 256k chunks
      
unused devices: <none>

Prepare written instructions on how to repair disk arrays.

What disks to we have?

Add extra spare disks?

How do you know which physical disk is broken to replace it?

There is a utility, tw_cli, which can be used to control the hardware raid. The storage on the HPC is using a RAID array. (Level?)

Study the output of show to know which controller to manage. Then you can use /c1 show to show the status of that particular controller.

Remove the faulty port:

maint remove c1 p5

Insert a new drive and rescan:

maint rescan

maint rebuild c1 u2 p5