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pveceph: reword memory precondition

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and add the memory target for OSDs, included since Luminous. As well as
distinguish the memory usage between the OSD backends.

Signed-off-by: Alwin Antreich <a.antreich@proxmox.com>
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Alwin Antreich 2020-02-17 15:02:14 +01:00 committed by Thomas Lamprecht
parent 34694a05e7
commit 5b502340ad
1 changed files with 10 additions and 3 deletions
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pveceph.adoc
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@ -86,9 +86,16 @@ provide enough resources for stable and durable Ceph performance.
.Memory
Especially in a hyper-converged setup, the memory consumption needs to be
carefully monitored. In addition to the intended workload from virtual machines
and container, Ceph needs enough memory available to provide good and stable
performance. As a rule of thumb, for roughly 1 TiB of data, 1 GiB of memory
will be used by an OSD. OSD caching will use additional memory.
and containers, Ceph needs enough memory available to provide excellent and
stable performance.
As a rule of thumb, for roughly **1 TiB of data, 1 GiB of memory** will be used
by an OSD. Especially during recovery, rebalancing or backfilling.
The daemon itself will use additional memory. The Bluestore backend of the
daemon requires by default **3-5 GiB of memory** (adjustable). In contrast, the
legacy Filestore backend uses the OS page cache and the memory consumption is
generally related to PGs of an OSD daemon.
.Network
We recommend a network bandwidth of at least 10 GbE or more, which is used