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Sue,
Does this same doc also apply for SSD drives, or is there a different doc, different rules.
Paul
-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Sue Baker
Sent: Monday, April 28, 2014 8:48 PM
To: midrange-l@xxxxxxxxxxxx
Subject: Re: 20 drives, raid 5 with hot spare, puts two drives in hot spare
rob@xxxxxxxxx wrote on Mon, 28 Apr 2014 10:46:26 GMT:
Of course, when I added these drives to the raid set I probably should
have broken them into two sets. I forgot that
18 is the maximum number of drives you can have in a raid set.
An email on the midrange-l list last night reminded me.
But, if I had done so, would that have tied up four drives for hot
spare?
I have a techdoc about this! See
http://www.ibm.com/support/techdocs/atsmastr.nsf/WebIndex/TD105880
To summarize, the number of drives attached to the IOAs at parity set creation time will determine both the quantity in the arry and the number of hot spares.
Paired adapters (IE 5913s) do not change the behavior.
And yes, I do neet to get an update out for the new EJ0L adapters which are capable of supporting up to 96 devices.
--
Sue
IBM Americas Advanced Technical Sales Support (ATS) Power Systems Rochester, MN
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