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Dawn May

Dawn May




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« 2012 - Looking Forward | Main | Ethernet Link Aggregation in IBM i »

January 17, 2012

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Big thing, even when doing the on site, is to make sure you're doing an apples-to-apples comparison. We did such a test of SSD's in an IASP. However due to some difficulties with setting up the journalling we just turned journalling off. That really skewed the results in favor of the SSD's. Money would have better spent on purchasing 5770SS1-42-HA journal performance. That made significantly more of a difference on our machine than SSD's did.

Would also be nice if
"PTF Requirements for Solid State Drives (SSD)"
http://www-912.ibm.com/s_dir/slkbase.NSF/DocNumber/534676318

was updated and this information available at
"Recommended fixes"
http://www-912.ibm.com/s_dir/slkbase.nsf/recommendedfixes

Rob,
Your point about "apples-to-apples comparison" is correct; what might seem like minor changes in an environment can indeed skew the results. This is true for any type of performance comparison.

Regarding the second comment about PTFs - I will see what I can do regarding information about the PTFs. If any changes are made, I'll post an update here.

Dawn

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