Ceph » rbd

"... I typically keep a background screen running `rbd perf image iostat` that shows all of the rbd devices with io, and how busy that disk may be at any given moment. Recently after upgrading everything to latest octopus release (15.2.16), it no longer allows for not specifying the pool, which then means I can’t blend all rbd pools together into a single view."

How it used to appear with 15.2.13:

$ rbd perf image iostat
> NAME                                WR    RD    WR_BYTES    RD_BYTES      WR_LAT    RD_LAT
> rbd-ssd/app1                     322/s   0/s   5.6 MiB/s       0 B/s     2.28 ms   0.00 ns
> rbd-ssd/app2                     223/s   5/s   2.1 MiB/s   147 KiB/s     3.56 ms   1.12 ms
> rbd-hybrid/app3                   76/s   0/s    11 MiB/s       0 B/s    16.61 ms   0.00 ns
> rbd-hybrid/app4                   11/s   0/s   395 KiB/s       0 B/s    51.29 ms   0.00 ns
> rbd-hybrid/app5                    3/s   0/s    74 KiB/s       0 B/s   151.54 ms   0.00 ns
> rbd-hybrid/app6                    0/s   0/s    42 KiB/s       0 B/s    13.90 ms   0.00 ns
> rbd-hybrid/app7                    0/s   0/s   2.4 KiB/s       0 B/s     1.70 ms   0.00 ns
>
> NAME                                WR    RD    WR_BYTES   RD_BYTES     WR_LAT      RD_LAT
> rbd-ssd/app1                     483/s   0/s   7.3 MiB/s      0 B/s    2.17 ms     0.00 ns
> rbd-ssd/app2                     279/s   5/s   2.5 MiB/s   69 KiB/s    3.82 ms   516.30 us
> rbd-hybrid/app3                  147/s   0/s    10 MiB/s      0 B/s    8.59 ms     0.00 ns
> rbd-hybrid/app6                   10/s   0/s   425 KiB/s      0 B/s   75.79 ms     0.00 ns
> rbd-hybrid/app8                    0/s   0/s   2.4 KiB/s      0 B/s    1.85 ms     0.00 ns

Now, with 15.2.16:

$ rbd perf image iostat
rbd: mgr command failed: (2) No such file or directory: [errno 2] RADOS object not found (Pool 'rbd' not found)

"I do not have a pool named `rbd` so that is correct ... Setting a pool name to one of my rbd pools either as pool-spec or -p/—pool works, but obviously only for that pool, and not for all rbd pools, as it functioned previously, in what appears to have been 15.2.13 previously."

https://lists.ceph.io/hyperkitty/list/ceph-users@ceph.io/thread/LIQYPOYTNZ3JWP4MYNG67BR54I4TVQHB/