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Which battery module serves which controller?

I have an original XServe RAID with only the drives served by the lower controller populated. It has been in service since about 2003, if memory serves. I have a few questions:

1) How can I tell if the cache batteries are any good? The RAID admin software seems to perpetually have them in a discharge conditioning cycle of 87-90%

2) Which battery module serves which controller (I only want to replace one if I have to)

TIA,

Will

Xserve RAID, Mac OS X (10.2.x)

Posted on Apr 3, 2008 7:26 PM

Reply
3 replies

Apr 3, 2008 7:30 PM in response to Will Starck1

The battery modules are redundant. They both serve both controllers, and one of the batteries can back up the caches for the specified 72 hours.

That said, if they're 5 years old, they're probably getting old. I doubt they'd each work for 72 hours. They're only $300 for the pair; it's probably worth replacing both if you value your data 😉

Also note that drives that are 5 years old are getting long in the tooth as well. Have you had any failures yet? Most data center operators would replace the drives at the 4 year mark, and certainly by 5. A MTBF of 500,000 to 1 million hours doesn't really mean you should run them that long 🙂

Which battery module serves which controller?

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