Changes between Version 21 and Version 22 of SmartArray

Timestamp:

09/04/13 11:34:49 (11 years ago)

Author:

Adam Cécile

Comment:

--

SmartArray

@@ -159 +159 @@
 
 [[BR]][[BR]]
+
+Controller policies (write cache, disk cache, battery), only interesting lines kept:
+{{{
+root@server:~# hpacucli ctrl slot=0 show 
+
+Smart Array P420i in Slot 0 (Embedded)
+   Serial Number: *SERIAL*
+   Controller Status: OK
+   Firmware Version: 3.54
+   Cache Board Present: True
+   Cache Status: OK
+   Cache Ratio: 25% Read / 75% Write
+   Drive Write Cache: Disabled
+   Total Cache Size: 512 MB
+   No-Battery Write Cache: Disabled
+   Cache Backup Power Source: Capacitors
+   Battery/Capacitor Count: 1
+   Battery/Capacitor Status: OK
+}}}
+
+Cache is ok, Battery is too. Write cache disabled if battery back isn't enabled, that's ok.
+
+Enable/Disable write cache for all arrays:
+
+Check current state:
+{{{
+root@server:~# hpacucli ctrl slot=0 ld all show detail
+
+Smart Array P420i in Slot 0 (Embedded)
+
+   array A
+
+      Logical Drive: 1
+         Size: 136.7 GB
+         Fault Tolerance: RAID 1
+         Status: OK
+         Caching:  Disabled
+
+}}}
+
+Enable caching:
+{{{
+root@server:~# hpacucli ctrl slot=0 ld all modify arrayaccelerator=enable
+}}}
+
+Enable disks' write cache:
+{{{
+root@server:~# hpacucli ctrl slot=0 modify dwc=enable
+
+Warning: Without the proper safety precautions, use of write cache on physical 
+         drives could cause data loss in the event of power failure.  To ensure
+         data is properly protected, use redundant power supplies and
+         Uninterruptible Power Supplies. Also, if you have multiple storage
+         enclosures, all data should be mirrored across them. Use of this
+         feature is not recommended unless these precautions are followed.
+         Continue? (y/n) y
+}}}
+
+Warning is self-explaining I guess. Disks's cache aren't protected by controller's battery. It's up to you but I wouldn't enable such features if your power supply isn't protected.