HDS – Status of controller while upgrading the microcode

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A question always come up before deciding to upgrade the microcode – “Will my servers have access to storage during the upgrade?”. The answer I’ve received from HDS engineers on this is summarised as below:

As long as you have 2 working paths to every connected device (1 from each controller/cluster), then there should be nothing to worry about.  Workload on Controllers and Front end ports will need to be below 50% for the duration of the upgrade to prevent any delays with host i/o. 

USPV:
Microcode for USPV is an nonstop scsi online process providing you have multiple paths to all connected hosts/external storage/replicated arrays etc.

AMS200/500/1000:
The AMS200/500/1000 series will have the microcode upgraded on one controller at a time. Each entire controller including ports will be offline whilst the code is upgraded.  This will be done one at a time and once the 1st controller is upgraded and back online, the 2nd controller will then be upgraded.

AMS2000:
Hosts will not lose connection to any FAs during the upgrade to the controllers, this is a totally online process (depending on starting code level.

DISCLAIMER:
Above information is for guideline only. Check with your HDS support engineer before deciding to upgrade.

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sanaswati
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