Hi Guys,
This is my first post on mailing list and would like to have your suggestions on this. I'm contemplating setting up a varnish cache on a system with SSD drives. The obvious benefit is that these systems have great READ speeds and I expect my hit ratios to be fairly high. Let's assume I can put 7 SSDs in to a RAID configuration. (there are some cases that will let me pack in much much more) Implementation questions: Should I use RAID0? (I expect a drive to fail eventually, so this seems dangerous.) Should I use RAID10? (This halves my disk footprint, which is costly.) Should I use RAID5? (SSDs are known to have "bad" write performance and write limits, and all the extra parity writes may slow this down considerably.) Should I just treat each disk as it's own squid datastore? (how well does squid handle multiple data stores? and what happens if/when one fails?) Should I ignore datastores and just make the SSDs in to large SWAP partitions and let the linux VM do it's thing? (seems sloppy) Any advice from you using SSDs in production environments would be greatly appreciated. (esp if you're using them for HTTP caches) Also how difficult it is for a varnish cache to allow users manage data life cycle policy from SSD/NAND flash drives to disk. There is an open source project on Online Hierarchical Storage Manager (OHSM) (e.g. http://code.google.com/p/fscops/) which i am on verge of trying bt havent succeeded yet. Awaiting for your reply on this!!!! Regards, Anand Shah
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