Hi,
I have a CephFS cluster
```
> ceph -s
cluster:
id: e78987f2-ef1c-11ed-897d-cf8c255417f0
health: HEALTH_WARN
85 pgs not deep-scrubbed in time
85 pgs not scrubbed in time
services:
mon: 5 daemons, quorum
datastone05,datastone06,datastone07,datastone10,datastone09 (age 2w)
mgr: datastone05.iitngk(active, since 2w), standbys: datastone06.wjppdy
mds: 2/2 daemons up, 1 hot standby
osd: 22 osds: 22 up (since 3d), 22 in (since 4w); 8 remapped pgs
data:
volumes: 1/1 healthy
pools: 4 pools, 115 pgs
objects: 49.08M objects, 16 TiB
usage: 35 TiB used, 2.0 PiB / 2.1 PiB avail
pgs: 3807933/98160678 objects misplaced (3.879%)
107 active+clean
8 active+remapped+backfilling
io:
client: 224 MiB/s rd, 79 MiB/s wr, 844 op/s rd, 33 op/s wr
recovery: 8.8 MiB/s, 24 objects/s
```
The pool and pg status
```
> ceph osd pool autoscale-status
POOL SIZE TARGET SIZE RATE RAW CAPACITY RATIO TARGET RATIO
EFFECTIVE RATIO BIAS PG_NUM NEW PG_NUM AUTOSCALE BULK
cephfs.myfs.meta 28802M 2.0 2119T 0.0000
4.0 16 on False
cephfs.myfs.data 16743G 2.0 2119T 0.0154
1.0 32 on False
rbd 19 2.0 2119T 0.0000
1.0 32 on False
.mgr 3840k 2.0 2119T 0.0000
1.0 1 on False
```
The pool detail
```
> ceph osd pool ls detail
pool 1 'cephfs.myfs.meta' replicated size 2 min_size 1 crush_rule 0 object_hash
rjenkins pg_num 16 pgp_num 16 autoscale_mode on last_change 3639 lfor
0/3639/3637 flags hashpspool stripe_width 0 pg_autoscale_bias 4 pg_num_min 16
recovery_priority 5 application cephfs
pool 2 'cephfs.myfs.data' replicated size 2 min_size 1 crush_rule 0 object_hash
rjenkins pg_num 66 pgp_num 58 pg_num_target 32 pgp_num_target 32 autoscale_mode
on last_change 5670 lfor 0/5661/5659 flags hashpspool,selfmanaged_snaps
stripe_width 0 application cephfs
pool 3 'rbd' replicated size 2 min_size 1 crush_rule 0 object_hash rjenkins
pg_num 32 pgp_num 32 autoscale_mode on last_change 486 lfor 0/486/478 flags
hashpspool,selfmanaged_snaps stripe_width 0 application rbd
pool 4 '.mgr' replicated size 2 min_size 1 crush_rule 0 object_hash rjenkins
pg_num 1 pgp_num 1 autoscale_mode on last_change 39 flags hashpspool
stripe_width 0 pg_num_max 32 pg_num_min 1 application mgr
```
When pg numbers reduce, the mds server would have a chance to hang.
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