I wondered why mdbox_rotate_size is 2MB by default.
I thought if I increased it to 16MB, maybe there would be less disk io,
but I dont see any difference. Furthermore I read in some thread that
increasing it from 2MB, could give problems when deleting messages, can
someone explain this?
Does anyone have this on a cephfs mount, does it make sense to set this
to 4MB?
[@test2 ~]# pr -m -t mail04-mdbox-vdb-append-64kb-4MB-6.log
mail04-mdbox-vdb-append-64kb-16MB-7.log |less
Logi Sele Appe Logi Sele Appe
100% 100% 100% 100% 100% 100%
1 1 6 1/ 1 1 1 8 1/ 1
0 0 9 1/ 1 0 0 9 1/ 1
0 0 7 1/ 1 0 0 7 1/ 1
0 0 10 1/ 1 0 0 8 1/ 1
0 0 7 1/ 1 0 0 10 1/ 1
0 0 8 1/ 1 0 0 9 1/ 1
0 0 9 1/ 1 0 0 10 1/ 1
0 0 10 1/ 1 0 0 9 1/ 1
0 0 9 1/ 1 0 0 7 1/ 1
0 0 11 1/ 1 0 0 8 1/ 1
29 3 1093 ms/cmd avg 37 1 1110 ms/cmd avg
Logi Sele Appe Logi Sele Appe
100% 100% 100% 100% 100% 100%
0 0 10 1/ 1 0 0 8 1/ 1
0 0 9 1/ 1 0 0 8 1/ 1
0 0 10 1/ 1 0 0 10 1/ 1
0 0 9 1/ 1 0 0 10 1/ 1
0 0 11 1/ 1 0 0 8 1/ 1
0 0 9 1/ 1 0 0 9 1/ 1
0 0 8 1/ 1 0 0 6 1/ 1
0 0 11 1/ 1 0 0 9 1/ 1
0 0 9 1/ 1 0 0 7 1/ 1
0 0 9 1/ 1 0 0 9 1/ 1
0 0 1063 ms/cmd avg 0 0 1202 ms/cmd avg
Logi Sele Appe Logi Sele Appe
100% 100% 100% 100% 100% 100%
0 0 8 1/ 1 0 0 8 1/ 1
0 0 10 1/ 1 0 0 10 1/ 1
0 0 7 1/ 1 0 0 11 1/ 1
0 0 10 1/ 1 0 0 10 1/ 1
0 0 10 1/ 1 0 0 10 1/ 1
0 0 11 1/ 1 0 0 9 1/ 1
0 0 7 1/ 1 0 0 8 1/ 1
0 0 11 1/ 1 0 0 9 1/ 1
0 0 8 1/ 1 0 0 10 1/ 1
0 0 10 1/ 1 0 0 7 1/ 1
0 0 1077 ms/cmd avg 0 0 1060 ms/cmd avg
Logi Sele Appe Logi Sele Appe
100% 100% 100% 100% 100% 100%
0 0 7 1/ 1 0 0 9 1/ 1
0 0 9 1/ 1 0 0 10 1/ 1
0 0 6 1/ 1 0 0 6 1/ 1
0 0 9 1/ 1 0 0 7 1/ 1
0 0 8 1/ 1 0 0 9 1/ 1
0 0 10 1/ 1 0 0 10 1/ 1
0 0 9 1/ 1 0 0 9 1/ 1
0 0 7 1/ 1 0 0 10 1/ 1
0 0 9 1/ 1 0 0 9 1/ 1
0 0 7 1/ 1 0 0 9 1/ 1
0 0 1246 ms/cmd avg 0 0 1138 ms/cmd avg
...
...
...
...
0 0 8 1/ 1 0 0 9 1/ 1
0 0 6 1/ 1 0 0 8 1/ 1
0 0 6 1/ 1 0 0 7 1/ 1
0 0 7 1/ 1 0 0 8 1/ 1
0 0 5 1/ 1 0 0 9 1/ 1
0 0 5 1/ 1 0 0 10 1/ 1
0 0 6 1/ 1 0 0 11 1/ 1
0 0 7 1/ 1 0 0 9 1/ 1
0 0 6 1/ 1 0 0 9 1/ 1
0 0 7 1/ 1 0 0 10 1/ 1
0 0 1596 ms/cmd avg 0 0 1126 ms/cmd avg
Logi Sele Appe Logi Sele Appe
100% 100% 100% 100% 100% 100%
0 0 7 1/ 1 0 0 8 1/ 1
0 0 1583 ms/cmd avg 0 0 1140 ms/cmd avg
Totals: Totals:
Logi Sele Appe Logi Sele Appe
100% 100% 100% 100% 100% 100%
1 1 1978 1 1 2021
