> I would be suspicious of having the db on XIV. Do you have any FC > or SAS Disk you could try putting the DB on? I know XIV has lots > of CPU & cache, but underneath it all is still SATA. I've heard > Marketing types rave about how fast XIV is, even with SATA, > because I/O can be spread across many spindles, but I'm not > entirely convinced it's as good as 15k FC or SAS.
This is _exactly_ what IBM has not, and seems unwilling, to explain. Soon after IBM finalized the purchase of XIV, they had a series of seminars around the country (usa) about the box. This wasn't some little out of the way seminar . . . Moshe (inventor of the box) was there and gave much of the presentation. I attended one - Lets just say it was strange!!! They hammered on "high performance", over and over. They threw up one graph where they claimed 25k iops at 3ms response time for a "cache miss" workload. Lets see, cache miss means having to go to the spindle to do the I/O. SATA drives come no where close to this response time. The workload was either not cache miss, or, they effectively short-stroked the drive such that the heads never moved. When I questioned this claim I got nowhere - just run-around. Rick ----------------------------------------- The information contained in this message is intended only for the personal and confidential use of the recipient(s) named above. If the reader of this message is not the intended recipient or an agent responsible for delivering it to the intended recipient, you are hereby notified that you have received this document in error and that any review, dissemination, distribution, or copying of this message is strictly prohibited. If you have received this communication in error, please notify us immediately, and delete the original message.
