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This article mainly introduces ceph how to check where rbd is mounted, which has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, the following let the editor take you to understand it.

See where rbd is mounted

Since rbd showmapped can only display locally mounted rbd devices, if there are more machines and you happen to forget where the map is, you can only look for them one by one. This problem can be solved by using listwatchers.

For blocks with an image format of 1:

$rbd info bootrbd image 'boot': size 10240 MB in 2560 objects order 22 (4096 kB objects) block_name_prefix: rb.0.89ee.2ae8944a format: 1$ rados-p rbd listwatchers boot.rbdwatcher=192.168.251.102:0/2550823152 client.35321 cookie=1

For blocks with an image format of 2, there are some differences:

[root@osd2 ceph] # rbd info myrbd/rbd1rbd image 'rbd1': size 8192 kB in 2 objects order 22 (4096 kB objects) block_name_prefix: rbd_data.13436b8b4567 format: 2 features: layering [root@osd2 ceph] # rados-p myrbd listwatchers rbd_header.13436b8b4567watcher=192.168.108.3:0/2292307264 client.5130 cookie=1

You need to append the sequence number obtained by rbd info to rbd_header.

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