Hi,
It's observerd up to 10 times space is consumed when concurrent 200 files iozone writing test ,
with erasure code profile (k=8,m=4) data pool, mounted with ceph fuse, but disk usage is normal if only has one writing task .
Furthermore everything is normal using replicated data pool, no matter how many writing operations
at the same time.
Regards,
Dai
#iozone -s 100M -r 1M -i 0 -u 200 -l 200 -+n -w
#df -h /data01
ceph-fuse on /data01 type fuse.ceph-fuse (rw,nosuid,nodev,relatime,user_id=0,group_id=0,allow_other)
# du -sh /data01
801M /data01
#ceph df
RAW STORAGE:
CLASS SIZE AVAIL USED RAW USED %RAW USED
hdd 357 TiB 356 TiB 60 GiB 132 GiB 0.04
ssd 1.3 TiB 1.3 TiB 2.6 GiB 5.6 GiB 0.42
TOTAL 358 TiB 358 TiB 62 GiB 137 GiB 0.04
POOLS:
POOL ID STORED OBJECTS USED %USED MAX AVAIL
meta_data01 1 166 MiB 64 509 MiB 0.04 423 GiB
data_data01 2 800 MiB 201 8.9 GiB 0 226 TiB
#ceph osd pool get data_data01 erasure_code_profile
erasure_code_profile: profile_data01
#ceph osd erasure-code-profile get profile_data01
crush-device-class=
crush-failure-domain=host
crush-root=default
jerasure-per-chunk-alignment=false
k=8
m=4
plugin=jerasure
technique=reed_sol_van
w=8
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