Why Do You Recommend One Drive Per OSD » History » Version 1
Jessica Mack, 06/03/2015 03:05 AM
| 1 | 1 | Jessica Mack | h1. Why Do You Recommend One Drive Per OSD |
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| 3 | h3. Resolution |
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| 5 | Ceph OSD performance is one of the most common requests for assistance, and running an OS, a journal and an OSD on the same disk is a frequently the impediment to high performance. Total throughput and simultaneous reads and writes are a major bottleneck. If you journal data, run an OS, or run multiple OSDs on the same drive, you will very likely see performance degrade significantly–especially under high loads. |
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| 7 | Running multiple OSDs on a single drive is fine for evaluation purposes. We even encourage that in our "5-minute quick start":http://ceph.com/docs/master/start/quick-start. However, just because it works does NOT mean that it will provide acceptable performance in an operational cluster. |