Differences

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--- raid [2009/08/27 09:17] – 172.26.0.166
+++ raid [2009/09/29 14:54] – 172.26.0.166
@@ Line 1: / Line 1: @@
-=== HPC RAID array ===
+===== RAID =====
-The storage on the HPC is using a RAID array. (Level?)
+We have two RAIDs on the HPC
+  * Linux kernel software RAID
+  * 3mware hardware RAID
+| 0 | 1 | 2 | 3 |
+| 8 | 9 | 10 | 11 |
+| 4 | 5 | 6 | 7 |
+| 0 | 1 | 2 | 3 |
+===== Software RAID =====
 It is currently reporting a degraded array (27 Aug 2009):
@@ Line 24: / Line 33: @@
 Prepare written instructions on how to repair disk arrays.
+What disks to we have?
 Add extra spare disks?
@@ Line 29: / Line 40: @@
 How do you know which physical disk is broken to replace it?
+===== Hardware RAID =====
+There is a utility, tw_cli, which can be used to control the hardware raid.  The hardware RAID has three arrays, all RAID 5.  Each "unit" (row) is one array.
+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.  Things to look for:
+  * Which controller is active? (c0, c1, etc)
+  * Which unit is degraded? (u0, u1, u2, etc)
+  * Which
+Remove the faulty port:
+<code>maint remove c1 p5</code>
+Insert a new drive and rescan:
+<code>maint rescan</code>
+Rebuild the degraded array:
+<code>maint rebuild c1 u2 p5</code>
+Check the status of the rebuild by monitoring ''/c1 show''