Encrypted LVM on a SAN with SSD fast cache drives failure
Hi
We have just purchased a new EMC SAN with SSD fast-cache ( http://www.emc.com/about/glossary/fast-cache.htm ). I have set up a VM running database server with Postgres 8.4 on Debian squeeze 64bit with encrypted LVM partition and a second VM with unencrypted LVM, same spec otherwise. I was trying to determine how much impact the encryption will have on performance. The first results showed much slower performance of the encrypted one, but consecutive querries results were much better, encryption seemed to have minimal impact on the query speed. The query used LIKE clause to search for records containing a string Quote:
The server was freshly installed with default debian settings, I just tuned Postgres a bit ( or maybe a lot, my databases are from 50 to 120 Gig each, so it would not run on default settings ). Anyone have experience with running encrypted LVM on SAN with Fast-cache ? I'm a bit concerned with the result of my tests so far, don't want to store data on a server that's not reliable. Not sure what caused the issue, but it's kind of scary it happened. Greg |
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