4 ms·
EBS-RAID0 is much faster for reads than local. Local is faster for writes.
by cachemoney 16y ago
EBS-RAID0 is much faster for reads than local. Local is faster for writes.
- riledhel 16y agothis seems to contradict several comments here. "citation needed".
- cachemoney 16y agoI run a database cluster with dozens of nodes on EC2. Small entries, lots of small IOPS. From http://orion.heroku.com/past/2009/7/29/io_performance_on_ebs/ http://orion.heroku.com/past/2009/7/29/io_performance_on_ebs..., "On a good day, an EBS can give you 7,000 seeks per second and on a not so good day will give you only 200." The ephemeral store will never give you more than a hundred seeks per second. If you're seek-bound, then EBS, every time.
- bmurphy 16y agoMy experience has been that EBS handles concurrent loads better, ephemeral drives handle non-concurrent loads better. Transferring 100gb+ of data on EBS (even with an 8x RAID) is a nightmare. Ephemeral drives, however, it's fairly fast. Throw 100+ database connections at a few ephemeral drives (even in a RAID) and watch your web site slow to a crawl.