Dear all,
I would like to enable the balancer on a mimic 13.2.8 cluster in upmap mode.
Unfortunately, I have a lot of ceph fs kernel clients that report their version
as jewel, but might already support upmap. The ceph client kernel module
received already a lot of back-ports and supports features of later ceph
versions, for example, quotas. I guess they report back jewel, because not all
luminous/mimic features are back-ported yet. Is there a way to check if a
client supports upmap?
Here some info:
[root@gnosis ~]# ceph features
{
[...]
"client": [
{
"features": "0x27018fb86aa42ada",
"release": "jewel",
"num": 1676
},
{
"features": "0x2f018fb86aa42ada",
"release": "luminous",
"num": 1
},
{
"features": "0x3ffddff8ffacfffb",
"release": "luminous",
"num": 167
}
],
The fs clients are the top two entries, the third entry is rbd clients. Note
that the feature key for the fs clients is almost identical. Here a snippet
from mds session ls for one such jewel client:
{
"id": 25641514,
"num_leases": 0,
"num_caps": 1,
"state": "open",
"request_load_avg": 0,
"uptime": 588563.550276,
"replay_requests": 0,
"completed_requests": 0,
"reconnecting": false,
"inst": "client.25641514 192.168.57.124:0/3398308464",
"client_metadata": {
"features": "00000000000000ff",
"entity_id": "con-fs2-hpc",
"hostname": "sn253.hpc.ait.dtu.dk",
"kernel_version": "3.10.0-957.12.2.el7.x86_64",
"root": "/hpc/groups"
}
}
Since I would like to use upmap right from the beginning, my alternative is to
re-weight a few of the really bad outliers manually to simplify changing back.
What would you suggest?
Thanks and best regards,
=================
Frank Schilder
AIT Risø Campus
Bygning 109, rum S14
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