Re: [ceph-users] Snapshot Costs (Was: Re: Pool Sizes)

2017-03-07 Thread Kent Borg
On 03/07/2017 04:35 PM, Gregory Farnum wrote: Creating a snapshot generally involves a round-trip to the monitor, which requires a new OSDMap epoch (although it can coalesce) — ie, the monitor paxos commit and processing the new map on all the OSDs/PGs. Destroying a snapshot involves adding the s

Re: [ceph-users] Snapshot Costs (Was: Re: Pool Sizes)

2017-03-07 Thread Gregory Farnum
On Tue, Mar 7, 2017 at 12:43 PM, Kent Borg wrote: > On 01/04/2017 03:41 PM, Brian Andrus wrote: >> >> Think "many objects, few pools". The number of pools do not scale well >> because of PG limitations. Keep a small number of pools with the proper >> number of PGs. > > > I finally got it through m

[ceph-users] Snapshot Costs (Was: Re: Pool Sizes)

2017-03-07 Thread Kent Borg
On 01/04/2017 03:41 PM, Brian Andrus wrote: Think "many objects, few pools". The number of pools do not scale well because of PG limitations. Keep a small number of pools with the proper number of PGs. I finally got it through my head, seems the larger answer is: Not only it is okay to have a