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Sue / Larry,
Why are you saying mixing is unsupported?
When IBM announced this back in Oct 2011, this was one of the big pluses.
PCIe SAS adapters
#5901
#5805/5903
#5913
Write cache effective
0
380 MB
1800 MB
Write cache real
0
380 MB
1800 MB
# PCI slots per adapter
1
1
1
Two cards required
optional
required
required
Rule of thumb - max HDD
modest
18/24-30
72
Rule of thumb - max SSD
0
3-5
24-26
Mix HDD & SSD on same adapter/adapter pair
n/a
no
yes
Cache battery maintenance
no
Yes
NO!!! (Hooray)
-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Sue Baker
Sent: Friday, October 25, 2013 9:20 AM
To: midrange-l@xxxxxxxxxxxx
Subject: Re: Performance recommendations for pair of 5913s
DrFranken <midrange@xxxxxxxxxxxx<mailto:midrange@xxxxxxxxxxxx>> wrote on Thu, 24 Oct 2013
23:11:18 GMT:
To be clear you would expect performance to be unpredictable
if you
DID Mix SSDs and Spinnys in the same enclosure (and thus on the same
SAS port)
That is correct, Larry. Remember it is an UNSUPPORTED implementation.
--
Sue
IBM Americas Advanced Technical Skills (ATS) Power Systems Rochester, MN
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