Hello Shawn,

Thanks for the info, I had not considered that each host has a weight also.

By default it seems to be the overall size of all the disks in that system. The 
systems with the SSDs that are getting full are due to the additional HDD 
capacity on that system making that host weight higher!

Is we keep the HDD to SSD ratio on each host the same it should fix it.

# ceph osd tree
ID  CLASS WEIGHT    TYPE NAME                     STATUS REWEIGHT PRI-AFF
-1       534.60309 root default
-19        62.90637     host NAS-AUBUN-RK2-CEPH06
104   hdd   5.56000         osd.104                   up  1.00000 1.00000
105   hdd   5.56000         osd.105                   up  1.00000 1.00000
106   hdd   5.56000         osd.106                   up  1.00000 1.00000
107   hdd   5.56000         osd.107                   up  1.00000 1.00000
108   hdd   5.56000         osd.108                   up  1.00000 1.00000
109   hdd   5.56000         osd.109                   up  1.00000 1.00000
110   hdd   5.56000         osd.110                   up  1.00000 1.00000
111   hdd   5.56000         osd.111                   up  1.00000 1.00000
112   hdd   5.56000         osd.112                   up  1.00000 1.00000
113   hdd   5.56000         osd.113                   up  1.00000 1.00000
114   hdd   5.56000         osd.114                   up  1.00000 1.00000
115   ssd   0.43660         osd.115                   up  1.00000 1.00000
116   ssd   0.43660         osd.116                   up  1.00000 1.00000
117   ssd   0.43660         osd.117                   up  1.00000 1.00000
118   ssd   0.43660         osd.118                   up  1.00000 1.00000
-22       105.51169     host NAS-AUBUN-RK2-CEPH07
119   hdd   5.45749         osd.119                   up  1.00000 1.00000
120   hdd   5.45749         osd.120                   up  1.00000 1.00000
121   hdd   5.45749         osd.121                   up  1.00000 1.00000
122   hdd   5.45749         osd.122                   up  1.00000 1.00000
123   hdd   5.45749         osd.123                   up  1.00000 1.00000
124   hdd   5.45749         osd.124                   up  1.00000 1.00000
125   hdd   5.45749         osd.125                   up  1.00000 1.00000
126   hdd   5.45749         osd.126                   up  1.00000 1.00000
127   hdd   5.45749         osd.127                   up  1.00000 1.00000
128   hdd   5.45749         osd.128                   up  1.00000 1.00000
129   hdd   5.45749         osd.129                   up  1.00000 1.00000
130   hdd   5.45749         osd.130                   up  1.00000 1.00000
131   hdd   5.45749         osd.131                   up  1.00000 1.00000
132   hdd   5.45749         osd.132                   up  1.00000 1.00000
133   hdd   5.45749         osd.133                   up  1.00000 1.00000
134   hdd   5.45749         osd.134                   up  1.00000 1.00000
135   hdd   5.45749         osd.135                   up  1.00000 1.00000
136   hdd   5.45749         osd.136                   up  1.00000 1.00000
137   hdd   5.45749         osd.137                   up  1.00000 1.00000
138   ssd   0.90970         osd.138                   up  1.00000 1.00000
139   ssd   0.90970         osd.139                   up  1.00000 1.00000
-25       105.51169     host NAS-AUBUN-RK2-CEPH08
142   hdd   5.45749         osd.142                   up  1.00000 1.00000
143   hdd   5.45749         osd.143                   up  1.00000 1.00000
144   hdd   5.45749         osd.144                   up  1.00000 1.00000
145   hdd   5.45749         osd.145                   up  1.00000 1.00000
146   hdd   5.45749         osd.146                   up  1.00000 1.00000
147   hdd   5.45749         osd.147                   up  1.00000 1.00000
148   hdd   5.45749         osd.148                   up  1.00000 1.00000
149   hdd   5.45749         osd.149                   up  1.00000 1.00000
150   hdd   5.45749         osd.150                   up  1.00000 1.00000
151   hdd   5.45749         osd.151                   up  1.00000 1.00000
152   hdd   5.45749         osd.152                   up  1.00000 1.00000
153   hdd   5.45749         osd.153                   up  1.00000 1.00000
154   hdd   5.45749         osd.154                   up  1.00000 1.00000
155   hdd   5.45749         osd.155                   up  1.00000 1.00000
156   hdd   5.45749         osd.156                   up  1.00000 1.00000
157   hdd   5.45749         osd.157                   up  1.00000 1.00000
158   hdd   5.45749         osd.158                   up  1.00000 1.00000
159   hdd   5.45749         osd.159                   up  1.00000 1.00000
160   hdd   5.45749         osd.160                   up  1.00000 1.00000
140   ssd   0.90970         osd.140                   up  1.00000 1.00000
141   ssd   0.90970         osd.141                   up  1.00000 1.00000
-3        56.32617     host NAS-AUBUN-RK3-CEPH01
  0   hdd   2.72899         osd.0                     up  1.00000 1.00000
  1   hdd   2.72899         osd.1                     up  1.00000 1.00000
  2   hdd   2.72899         osd.2                     up  1.00000 1.00000
  5   hdd   2.72899         osd.5                     up  1.00000 1.00000
  6   hdd   2.72899         osd.6                     up  1.00000 1.00000
  7   hdd   2.72899         osd.7                     up  1.00000 1.00000
  8   hdd   2.72899         osd.8                     up  1.00000 1.00000
  9   hdd   2.72899         osd.9                     up  1.00000 1.00000
10   hdd   2.72899         osd.10                    up  1.00000 1.00000
11   hdd   2.72899         osd.11                    up  1.00000 1.00000
12   hdd   2.72899         osd.12                    up  1.00000 1.00000
13   hdd   2.72899         osd.13                    up  1.00000 1.00000
14   hdd   2.72899         osd.14                    up  1.00000 1.00000
15   hdd   2.72899         osd.15                    up  1.00000 1.00000
16   hdd   2.72899         osd.16                    up  1.00000 1.00000
17   hdd   2.72899         osd.17                    up  1.00000 1.00000
18   hdd   2.72899         osd.18                    up  1.00000 1.00000
19   hdd   2.72899         osd.19                    up  1.00000 1.00000
20   hdd   2.72899         osd.20                    up  1.00000 1.00000
21   hdd   2.72899         osd.21                    up  1.00000 1.00000
60   ssd   0.43660         osd.60                    up  1.00000 1.00000
61   ssd   0.43660         osd.61                    up  1.00000 1.00000
62   ssd   0.43660         osd.62                    up  1.00000 1.00000
63   ssd   0.43660         osd.63                    up  1.00000 1.00000
-5        56.32617     host NAS-AUBUN-RK3-CEPH02
  3   hdd   2.72899         osd.3                     up  1.00000 1.00000
22   hdd   2.72899         osd.22                    up  1.00000 1.00000
23   hdd   2.72899         osd.23                    up  1.00000 1.00000
24   hdd   2.72899         osd.24                    up  1.00000 1.00000
25   hdd   2.72899         osd.25                    up  1.00000 1.00000
26   hdd   2.72899         osd.26                    up  1.00000 1.00000
27   hdd   2.72899         osd.27                    up  1.00000 1.00000
28   hdd   2.72899         osd.28                    up  1.00000 1.00000
29   hdd   2.72899         osd.29                    up  1.00000 1.00000
30   hdd   2.72899         osd.30                    up  1.00000 1.00000
31   hdd   2.72899         osd.31                    up  1.00000 1.00000
32   hdd   2.72899         osd.32                    up  1.00000 1.00000
33   hdd   2.72899         osd.33                    up  1.00000 1.00000
34   hdd   2.72899         osd.34                    up  1.00000 1.00000
35   hdd   2.72899         osd.35                    up  1.00000 1.00000
36   hdd   2.72899         osd.36                    up  1.00000 1.00000
37   hdd   2.72899         osd.37                    up  1.00000 1.00000
38   hdd   2.72899         osd.38                    up  1.00000 1.00000
39   hdd   2.72899         osd.39                    up  1.00000 1.00000
40   hdd   2.72899         osd.40                    up  1.00000 1.00000
64   ssd   0.43660         osd.64                    up  1.00000 1.00000
65   ssd   0.43660         osd.65                    up  1.00000 1.00000
66   ssd   0.43660         osd.66                    up  1.00000 1.00000
67   ssd   0.43660         osd.67                    up  1.00000 1.00000
-7        56.32617     host NAS-AUBUN-RK3-CEPH03
  4   hdd   2.72899         osd.4                     up  1.00000 1.00000
41   hdd   2.72899         osd.41                    up  1.00000 1.00000
42   hdd   2.72899         osd.42                    up  1.00000 1.00000
43   hdd   2.72899         osd.43                    up  1.00000 1.00000
44   hdd   2.72899         osd.44                    up  1.00000 1.00000
45   hdd   2.72899         osd.45                    up  1.00000 1.00000
46   hdd   2.72899         osd.46                    up  1.00000 1.00000
47   hdd   2.72899         osd.47                    up  1.00000 1.00000
48   hdd   2.72899         osd.48                    up  1.00000 1.00000
49   hdd   2.72899         osd.49                    up  1.00000 1.00000
50   hdd   2.72899         osd.50                    up  1.00000 1.00000
51   hdd   2.72899         osd.51                    up  1.00000 1.00000
52   hdd   2.72899         osd.52                    up  1.00000 1.00000
53   hdd   2.72899         osd.53                    up  1.00000 1.00000
54   hdd   2.72899         osd.54                    up  1.00000 1.00000
55   hdd   2.72899         osd.55                    up  1.00000 1.00000
56   hdd   2.72899         osd.56                    up  1.00000 1.00000
57   hdd   2.72899         osd.57                    up  1.00000 1.00000
58   hdd   2.72899         osd.58                    up  1.00000 1.00000
59   hdd   2.72899         osd.59                    up  1.00000 1.00000
68   ssd   0.43660         osd.68                    up  1.00000 1.00000
69   ssd   0.43660         osd.69                    up  1.00000 1.00000
70   ssd   0.43660         osd.70                    up  1.00000 1.00000
71   ssd   0.43660         osd.71                    up  1.00000 1.00000
-13        45.84741     host NAS-AUBUN-RK3-CEPH04
80   hdd   3.63869         osd.80                    up  1.00000 1.00000
81   hdd   3.63869         osd.81                    up  1.00000 1.00000
82   hdd   3.63869         osd.82                    up  1.00000 1.00000
83   hdd   3.63869         osd.83                    up  1.00000 1.00000
84   hdd   3.63869         osd.84                    up  1.00000 1.00000
85   hdd   3.63869         osd.85                    up  1.00000 1.00000
86   hdd   3.63869         osd.86                    up  1.00000 1.00000
87   hdd   3.63869         osd.87                    up  1.00000 1.00000
88   hdd   3.63869         osd.88                    up  1.00000 1.00000
89   hdd   3.63869         osd.89                    up  1.00000 1.00000
90   hdd   3.63869         osd.90                    up  1.00000 1.00000
91   hdd   3.63869         osd.91                    up  1.00000 1.00000
72   ssd   0.54579         osd.72                    up  1.00000 1.00000
73   ssd   0.54579         osd.73                    up  1.00000 1.00000
76   ssd   0.54579         osd.76                    up  1.00000 1.00000
77   ssd   0.54579         osd.77                    up  1.00000 1.00000
-16        45.84741     host NAS-AUBUN-RK3-CEPH05
92   hdd   3.63869         osd.92                    up  1.00000 1.00000
93   hdd   3.63869         osd.93                    up  1.00000 1.00000
94   hdd   3.63869         osd.94                    up  1.00000 1.00000
95   hdd   3.63869         osd.95                    up  1.00000 1.00000
96   hdd   3.63869         osd.96                    up  1.00000 1.00000
97   hdd   3.63869         osd.97                    up  1.00000 1.00000
98   hdd   3.63869         osd.98                    up  1.00000 1.00000
99   hdd   3.63869         osd.99                    up  1.00000 1.00000
100   hdd   3.63869         osd.100                   up  1.00000 1.00000
101   hdd   3.63869         osd.101                   up  1.00000 1.00000
102   hdd   3.63869         osd.102                   up  1.00000 1.00000
103   hdd   3.63869         osd.103                   up  1.00000 1.00000
74   ssd   0.54579         osd.74                    up  1.00000 1.00000
75   ssd   0.54579         osd.75                    up  1.00000 1.00000
78   ssd   0.54579         osd.78                    up  1.00000 1.00000
79   ssd   0.54579         osd.79                    up  1.00000 1.00000
Kind regards,
Glen Baars

From: Shawn Iverson <[email protected]>
Sent: Saturday, 21 July 2018 9:21 PM
To: Glen Baars <[email protected]>
Cc: ceph-users <[email protected]>
Subject: Re: [ceph-users] 12.2.7 - Available space decreasing when adding disks

Glen,

Correction...looked at the wrong column for weights, my bad...

I was looking at the wrong column for weight.  You have varying weights, but 
the process is still the same.  Balance your buckets (hosts) in your crush map, 
and balance your osds in each bucket (host).

On Sat, Jul 21, 2018 at 9:14 AM, Shawn Iverson 
<[email protected]<mailto:[email protected]>> wrote:
Glen,

It appears you have 447G, 931G, and 558G disks in your cluster, all with a 
weight of 1.0.  This means that although the new disks are bigger, they are not 
going to be utilized by pgs any more than any other disk.

I would suggest reweighting your other disks (they are smaller), so that you 
balance your cluster.  You should do this gradually over time, preferably 
during off-peak times, when remapping will not affect operations.

I do a little math, first by taking total cluster capacity and dividing it by 
total capacity of each bucket.  I then do the same thing in each bucket, until 
everything is proportioned appropriately down to the osds.

On Fri, Jul 20, 2018 at 8:43 PM, Glen Baars 
<[email protected]<mailto:[email protected]>> wrote:
Hello Ceph Users,

We have added more ssd storage to our ceph cluster last night. We added 4 x 1TB 
drives and the available space went from 1.6TB to 0.6TB ( in `ceph df` for the 
SSD pool ).

I would assume that the weight needs to be changed but I didn’t think I would 
need to? Should I change them to 0.75 from 0.9 and hopefully it will rebalance 
correctly?

#ceph osd tree | grep -v hdd
ID  CLASS WEIGHT    TYPE NAME                     STATUS REWEIGHT PRI-AFF
-1       534.60309 root default
-19        62.90637     host NAS-AUBUN-RK2-CEPH06
115   ssd   0.43660         osd.115                   up  1.00000 1.00000
116   ssd   0.43660         osd.116                   up  1.00000 1.00000
117   ssd   0.43660         osd.117                   up  1.00000 1.00000
118   ssd   0.43660         osd.118                   up  1.00000 1.00000
-22       105.51169     host NAS-AUBUN-RK2-CEPH07
138   ssd   0.90970         osd.138                   up  1.00000 1.00000 Added
139   ssd   0.90970         osd.139                   up  1.00000 1.00000 Added
-25       105.51169     host NAS-AUBUN-RK2-CEPH08
140   ssd   0.90970         osd.140                   up  1.00000 1.00000 Added
141   ssd   0.90970         osd.141                   up  1.00000 1.00000 Added
-3        56.32617     host NAS-AUBUN-RK3-CEPH01
60   ssd   0.43660         osd.60                    up  1.00000 1.00000
61   ssd   0.43660         osd.61                    up  1.00000 1.00000
62   ssd   0.43660         osd.62                    up  1.00000 1.00000
63   ssd   0.43660         osd.63                    up  1.00000 1.00000
-5        56.32617     host NAS-AUBUN-RK3-CEPH02
64   ssd   0.43660         osd.64                    up  1.00000 1.00000
65   ssd   0.43660         osd.65                    up  1.00000 1.00000
66   ssd   0.43660         osd.66                    up  1.00000 1.00000
67   ssd   0.43660         osd.67                    up  1.00000 1.00000
-7        56.32617     host NAS-AUBUN-RK3-CEPH03
68   ssd   0.43660         osd.68                    up  1.00000 1.00000
69   ssd   0.43660         osd.69                    up  1.00000 1.00000
70   ssd   0.43660         osd.70                    up  1.00000 1.00000
71   ssd   0.43660         osd.71                    up  1.00000 1.00000
-13        45.84741     host NAS-AUBUN-RK3-CEPH04
72   ssd   0.54579         osd.72                    up  1.00000 1.00000
73   ssd   0.54579         osd.73                    up  1.00000 1.00000
76   ssd   0.54579         osd.76                    up  1.00000 1.00000
77   ssd   0.54579         osd.77                    up  1.00000 1.00000
-16        45.84741     host NAS-AUBUN-RK3-CEPH05
74   ssd   0.54579         osd.74                    up  1.00000 1.00000
75   ssd   0.54579         osd.75                    up  1.00000 1.00000
78   ssd   0.54579         osd.78                    up  1.00000 1.00000
79   ssd   0.54579         osd.79                    up  1.00000 1.00000

# ceph osd df | grep -v hdd
ID  CLASS WEIGHT  REWEIGHT SIZE  USE   AVAIL %USE  VAR  PGS
115   ssd 0.43660  1.00000  447G  250G  196G 56.00 1.72 103
116   ssd 0.43660  1.00000  447G  191G  255G 42.89 1.32  84
117   ssd 0.43660  1.00000  447G  213G  233G 47.79 1.47  92
118   ssd 0.43660  1.00000  447G  208G  238G 46.61 1.43  85
138   ssd 0.90970  1.00000  931G  820G  111G 88.08 2.71 216 Added
139   ssd 0.90970  1.00000  931G  771G  159G 82.85 2.55 207 Added
140   ssd 0.90970  1.00000  931G  709G  222G 76.12 2.34 197 Added
141   ssd 0.90970  1.00000  931G  664G  267G 71.31 2.19 184 Added
60   ssd 0.43660  1.00000  447G  275G  171G 61.62 1.89 100
61   ssd 0.43660  1.00000  447G  237G  209G 53.04 1.63  90
62   ssd 0.43660  1.00000  447G  275G  171G 61.58 1.89  95
63   ssd 0.43660  1.00000  447G  260G  187G 58.15 1.79  97
64   ssd 0.43660  1.00000  447G  232G  214G 52.08 1.60  83
65   ssd 0.43660  1.00000  447G  207G  239G 46.36 1.42  75
66   ssd 0.43660  1.00000  447G  217G  230G 48.54 1.49  84
67   ssd 0.43660  1.00000  447G  252G  195G 56.36 1.73  92
68   ssd 0.43660  1.00000  447G  248G  198G 55.56 1.71  94
69   ssd 0.43660  1.00000  447G  229G  217G 51.25 1.57  84
70   ssd 0.43660  1.00000  447G  259G  187G 58.01 1.78  87
71   ssd 0.43660  1.00000  447G  267G  179G 59.83 1.84  97
72   ssd 0.54579  1.00000  558G  217G  341G 38.96 1.20 100
73   ssd 0.54579  1.00000  558G  283G  275G 50.75 1.56 121
76   ssd 0.54579  1.00000  558G  286G  272G 51.33 1.58 129
77   ssd 0.54579  1.00000  558G  246G  312G 44.07 1.35 104
74   ssd 0.54579  1.00000  558G  273G  285G 48.91 1.50 122
75   ssd 0.54579  1.00000  558G  281G  276G 50.45 1.55 114
78   ssd 0.54579  1.00000  558G  289G  269G 51.80 1.59 133
79   ssd 0.54579  1.00000  558G  276G  282G 49.39 1.52 119
Kind regards,
Glen Baars
BackOnline Manager

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--
Shawn Iverson, CETL
Director of Technology
Rush County Schools
765-932-3901 x1171
[email protected]<mailto:[email protected]>

[https://docs.google.com/uc?export=download&id=0Bw5iD0ToYvs_cy1OZFNIZ0drYVU&revid=0Bw5iD0ToYvs_UitIcHVIWkJVVTl2VGpxVUE0d0FQcHBIRXk4PQ][https://docs.google.com/uc?export=download&id=0Bw5iD0ToYvs_Zkh4eEs3R01yWXc&revid=0Bw5iD0ToYvs_QWpBK2Y2ajJtYjhOMDRFekZwK2xOamk5Q3Y0PQ]
[https://docs.google.com/uc?export=download&id=1aBrlQou4gjB04FY-twHN_0Dn3GHVNxqa&revid=0Bw5iD0ToYvs_RnQ0eDhHcm95WHBFdkNRbXhQRXpoYkR6SEEwPQ]



--
Shawn Iverson, CETL
Director of Technology
Rush County Schools
765-932-3901 x1171
[email protected]<mailto:[email protected]>

[https://docs.google.com/uc?export=download&id=0Bw5iD0ToYvs_cy1OZFNIZ0drYVU&revid=0Bw5iD0ToYvs_UitIcHVIWkJVVTl2VGpxVUE0d0FQcHBIRXk4PQ][https://docs.google.com/uc?export=download&id=0Bw5iD0ToYvs_Zkh4eEs3R01yWXc&revid=0Bw5iD0ToYvs_QWpBK2Y2ajJtYjhOMDRFekZwK2xOamk5Q3Y0PQ]
[https://docs.google.com/uc?export=download&id=1aBrlQou4gjB04FY-twHN_0Dn3GHVNxqa&revid=0Bw5iD0ToYvs_RnQ0eDhHcm95WHBFdkNRbXhQRXpoYkR6SEEwPQ]
This e-mail is intended solely for the benefit of the addressee(s) and any 
other named recipient. It is confidential and may contain legally privileged or 
confidential information. If you are not the recipient, any use, distribution, 
disclosure or copying of this e-mail is prohibited. The confidentiality and 
legal privilege attached to this communication is not waived or lost by reason 
of the mistaken transmission or delivery to you. If you have received this 
e-mail in error, please notify us immediately.
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