Hi Igor,
Many thanks for your reply. Here are the details
about the cluster:
1. Ceph version - 13.2.5-1xenial (installed from
Ceph repository for ubuntu 16.04)
2. main devices for radosgw pool - hdd. we do use a
few ssds for the other pool, but it is not used by
radosgw
3. we use BlueStore
4. Average rgw object size - I have no idea how to
check that. Couldn't find a simple answer from google
either. Could you please let me know how to check
that?
5. Ceph osd df tree:
6. Other useful info on the cluster:
# ceph osd df tree
ID CLASS WEIGHT REWEIGHT SIZE USE
AVAIL %USE VAR PGS TYPE NAME
-1 112.17979 - 113 TiB 90 TiB 23
TiB 79.25 1.00 - root uk
-5 112.17979 - 113 TiB 90 TiB 23
TiB 79.25 1.00 - datacenter ldex
-11 112.17979 - 113 TiB 90 TiB 23
TiB 79.25 1.00 - room ldex-dc3
-13 112.17979 - 113 TiB 90 TiB 23
TiB 79.25 1.00 - row row-a
-4 112.17979 - 113 TiB 90 TiB 23
TiB 79.25 1.00 - rack ldex-rack-a5
-2 28.04495 - 28 TiB 22 TiB 6.2
TiB 77.96 0.98 - host
arh-ibstorage1-ib
0 hdd 2.73000 0.79999 2.8 TiB 2.3 TiB 519
GiB 81.61 1.03 145 osd.0
1 hdd 2.73000 1.00000 2.8 TiB 1.9 TiB 847
GiB 70.00 0.88 130 osd.1
2 hdd 2.73000 1.00000 2.8 TiB 2.2 TiB 561
GiB 80.12 1.01 152 osd.2
3 hdd 2.73000 1.00000 2.8 TiB 2.3 TiB
469 GiB 83.41 1.05 160
osd.3
4 hdd 2.73000 1.00000 2.8 TiB 1.8 TiB
983 GiB 65.18 0.82 141
osd.4
32 hdd 5.45999 1.00000 5.5 TiB 4.4 TiB
1.1 TiB 80.68 1.02 306
osd.32
35 hdd 2.73000 1.00000 2.8 TiB 1.7 TiB
1.0 TiB 62.89 0.79 126
osd.35
36 hdd 2.73000 1.00000 2.8 TiB 2.3 TiB
464 GiB 83.58 1.05 175
osd.36
37 hdd 2.73000 0.89999 2.8 TiB 2.5 TiB
301 GiB 89.34 1.13 160
osd.37
5 ssd 0.74500 1.00000 745 GiB 642 GiB
103 GiB 86.15 1.09 65
osd.5
-3 28.04495 - 28 TiB 24 TiB
4.5 TiB 84.03 1.06 - host
arh-ibstorage2-ib
9 hdd 2.73000 0.95000 2.8 TiB 2.4 TiB
405 GiB 85.65 1.08 158
osd.9
10 hdd 2.73000 0.89999 2.8 TiB 2.4 TiB
352 GiB 87.52 1.10 169
osd.10
11 hdd 2.73000 1.00000 2.8 TiB 2.0 TiB
783 GiB 72.28 0.91 160
osd.11
12 hdd 2.73000 0.84999 2.8 TiB 2.4 TiB
359 GiB 87.27 1.10 153
osd.12
13 hdd 2.73000 1.00000 2.8 TiB 2.4 TiB
348 GiB 87.69 1.11 169
osd.13
14 hdd 2.73000 1.00000 2.8 TiB 2.5 TiB
283 GiB 89.97 1.14 170
osd.14
15 hdd 2.73000 1.00000 2.8 TiB 2.2 TiB
560 GiB 80.18 1.01 155
osd.15
16 hdd 2.73000 0.95000 2.8 TiB 2.4 TiB
332 GiB 88.26 1.11 178
osd.16
26 hdd 5.45999 1.00000 5.5 TiB 4.4 TiB
1.0 TiB 81.04 1.02 324
osd.26
7 ssd 0.74500 1.00000 745 GiB 607 GiB
138 GiB 81.48 1.03 62
osd.7
-15 28.04495 - 28 TiB 22 TiB
6.4 TiB 77.40 0.98 - host
arh-ibstorage3-ib
18 hdd 2.73000 0.95000 2.8 TiB 2.5 TiB
312 GiB 88.96 1.12 156
osd.18
19 hdd 2.73000 1.00000 2.8 TiB 2.0 TiB
771 GiB 72.68 0.92 162
osd.19
20 hdd 2.73000 1.00000 2.8 TiB 2.0 TiB
733 GiB 74.04 0.93 149
osd.20
21 hdd 2.73000 1.00000 2.8 TiB 2.2
TiB 533 GiB 81.12 1.02 155
osd.21
22 hdd 2.73000 1.00000 2.8 TiB 2.1
TiB 692 GiB 75.48 0.95 144
osd.22
23 hdd 2.73000 1.00000 2.8 TiB 1.6
TiB 1.1 TiB 58.43 0.74 130
osd.23
24 hdd 2.73000 1.00000 2.8 TiB 2.2
TiB 579 GiB 79.51 1.00 146
osd.24
25 hdd 2.73000 1.00000 2.8 TiB 1.9
TiB 886 GiB 68.63 0.87 147
osd.25
31 hdd 5.45999 1.00000 5.5 TiB 4.7
TiB 758 GiB 86.50 1.09 326
osd.31
6 ssd 0.74500 0.89999 744 GiB 640
GiB 104 GiB 86.01 1.09 61
osd.6
-17 28.04494 - 28 TiB 22
TiB 6.3 TiB 77.61 0.98 -
host arh-ibstorage4-ib
8 hdd 2.73000 1.00000 2.8 TiB 1.9
TiB 909 GiB 67.80 0.86 141
osd.8
17 hdd 2.73000 1.00000 2.8 TiB 1.9
TiB 904 GiB 67.99 0.86 144
osd.17
27 hdd 2.73000 1.00000 2.8 TiB 2.1
TiB 654 GiB 76.84 0.97 152
osd.27
28 hdd 2.73000 1.00000 2.8 TiB 2.3
TiB 481 GiB 82.98 1.05 153
osd.28
29 hdd 2.73000 1.00000 2.8 TiB 1.9
TiB 829 GiB 70.65 0.89 137
osd.29
30 hdd 2.73000 1.00000 2.8 TiB 2.0
TiB 762 GiB 73.03 0.92 142
osd.30
33 hdd 2.73000 1.00000 2.8 TiB 2.3
TiB 501 GiB 82.25 1.04 166
osd.33
34 hdd 5.45998 1.00000 5.5 TiB 4.5
TiB 968 GiB 82.77 1.04 325
osd.34
39 hdd 2.73000 0.95000 2.8 TiB 2.4
TiB 402 GiB 85.77 1.08 162
osd.39
38 ssd 0.74500 1.00000 745 GiB 671
GiB 74 GiB 90.02 1.14 68
osd.38
TOTAL 113 TiB 90
TiB 23 TiB 79.25
MIN/MAX VAR: 0.74/1.14 STDDEV: 8.14
# for i in
$(radosgw-admin bucket list | jq -r '.[]'); do
radosgw-admin bucket stats --bucket=$i | jq '.usage
| ."rgw.main" | .size_kb' ; done | awk '{ SUM += $1}
END { print SUM/1024/1024/1024 }'
6.59098
# ceph df
GLOBAL:
SIZE AVAIL RAW USED %RAW
USED
113 TiB 23 TiB 90 TiB
79.25
POOLS:
NAME ID USED
%USED MAX AVAIL OBJECTS
Primary-ubuntu-1 5 27 TiB
87.56 3.9 TiB 7302534
.users.uid 15 6.8 KiB
0 3.9 TiB 39
.users 16 335 B
0 3.9 TiB 20
.users.swift 17 14 B
0 3.9 TiB 1
.rgw.buckets 19 15 TiB
79.88 3.9 TiB 8787763
.users.email 22 0 B
0 3.9 TiB 0
.log 24 109 MiB
0 3.9 TiB 102301
.rgw.buckets.extra 37 0 B
0 2.6 TiB 0
.rgw.root 44 2.9 KiB
0 2.6 TiB 16
.rgw.meta 45 1.7 MiB
0 2.6 TiB 6249
.rgw.control 46 0 B
0 2.6 TiB 8
.rgw.gc 47 0 B
0 2.6 TiB 32
.usage 52 0 B
0 2.6 TiB 0
.intent-log 53 0 B
0 2.6 TiB 0
default.rgw.buckets.non-ec 54 0 B
0 2.6 TiB 0
.rgw.buckets.index 55 0 B
0 2.6 TiB 11485
.rgw 56 491 KiB
0 2.6 TiB 1686
Primary-ubuntu-1-ssd 57 1.2 TiB
92.39 105 GiB 379516
I am not too sure if the issue relates to the
BlueStore overhead as I would probably have seen the
discrepancy in my Primary-ubuntu-1 pool as well.
However, the data usage on Primary-ubuntu-1 pool
seems to be consistent with my expectations (precise
numbers to be verified soon). The issues seems to be
only with the .rgw-buckets pool where the "ceph df "
output shows 15TB of usage and the sum of all
buckets in that pool shows just over 6.5TB.
Cheers
Andrei
Hi Andrei,
The most obvious reason is space usage overhead
caused by BlueStore allocation granularity, e.g.
if bluestore_min_alloc_size is 64K and average
object size is 16K one will waste 48K per object
in average. This is rather a speculation so far as
we lack key the information about your cluster:
- Ceph version
- What are the main devices for OSD: hdd or ssd.
- BlueStore or FileStore.
- average RGW object size.
You might also want to collect and share
performance counter dumps (ceph daemon osd.N perf
dump) and "
" reports from a couple of your OSDs.
Thanks,
Igor
On 7/2/2019 11:43 AM,
Andrei Mikhailovsky wrote:
Bump!
Hi
Could someone please explain / show
how to troubleshoot the space usage in
Ceph and how to reclaim the unused
space?
I have a small cluster with 40 osds,
replica of 2, mainly used as a backend
for cloud stack as well as the S3
gateway. The used space doesn't make any
sense to me, especially the rgw pool, so
I am seeking help.
Here is what I found from the client:
Ceph -s shows the
usage: 89 TiB used, 24 TiB / 113
TiB avail
Ceph df shows:
Primary-ubuntu-1 5
27 TiB 90.11 3.0 TiB
7201098
Primary-ubuntu-1-ssd 57
1.2 TiB 89.62 143 GiB
359260
.rgw.buckets
19 15 TiB
83.73 3.0 TiB 8742222
the
usage of the Primary-ubuntu-1 and
Primary-ubuntu-1-ssd is in line with
my expectations. However, the
.rgw.buckets pool seems to be using way
too much. The usage of all rgw buckets
shows 6.5TB usage (looking at the
size_kb values from the "radosgw-admin
bucket stats"). I am trying to figure
out why .rgw.buckets is using 15TB of
space instead of the 6.5TB as shown from
the bucket usage.
Thanks
Andrei
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