On Thu, Apr 03, 2014 at 12:31:49AM +1300, Nicholas Lee wrote: > The SSD -C version with 15 x Intel S3700 800 GB SSD is pretty crazy. How > do you guys chop these up? Pair of RAIDZ2 with a hot spare? What do you do > with the spare slot 15 out of 16?
They're mirrored, 7x2 with a spare. Fast, fast, fast. The empty slot is empty because having a second spare isn't worth the cost. > How about the 12 x UltraStar 7K4000? What raid layout do you use for those > nodes? https://github.com/joyent/smartos-live/blob/master/src/node_modules/disklayout.js That code is used to lay out all storage pools on SDC systems. It's not currently used by SmartOS; someone could change that. It has a test mode that can accept any text file in the format produced by diskinfo -Hp, so you can play what-if. > Couple of the chassis (-A,-C) seem to be direct attach. I assume this is > because of performance, particularly with the SSD node. No. It's because the SSDs are SATA, and SATA devices should not be attached to SAS expanders for reliability reasons. If we were to switch our slogs and other SSDs to SAS, we would do away with direct-attach. ------------------------------------------- smartos-discuss Archives: https://www.listbox.com/member/archive/184463/=now RSS Feed: https://www.listbox.com/member/archive/rss/184463/25769125-55cfbc00 Modify Your Subscription: https://www.listbox.com/member/?member_id=25769125&id_secret=25769125-7688e9fb Powered by Listbox: http://www.listbox.com
