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On 04/19/17 07:42, gjprabu wrote:
For performance, it's always best to make it as parallel as possible. The OS is probably pretty static... mostly logs are written. So it might not impact performance much... but how much is too much depends on your needs. It's up to you to decide to combine them. The best practice is not to. The mons don't need much IO, but it is said that a really huge scale should have them totally separate as they become a bottleneck, and at small scale the mon still doesn't need much IO, but what it uses will slow down an OSD it shares with. So a mon could easily share the OS disk, especially an SSD, on a small cluster. And in general, the OSD should always be completely separate. But it won't crash if you combine it, until it ends up so slow that it times out. Whether this is acceptable or not depends on your needs. And same with journals, but more significantly slower if you colocate the journal with the osd, except if it's all SSD, then it's more cost effective to have more SSD osds with colocated journals than having separate journals to go with them (because you won't use all the space on the journal, it's more costly relative to the benefit, also using up valuable disk bays).
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