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Editor to share with you the example analysis of rbd format1 and rbd fromat2 in ceph, I believe that most people do not know much about it, so share this article for your reference, I hope you can learn a lot after reading this article, let's go to know it!

Rbd format1 and rbd fromat2

Rbd format1:

[root@osd1 /] # rbd create myrbd/rbd1-s 8 [root@osd1 /] # rbd info myrbd/rbd1rbd image 'rbd1': size 8192 kB in 2 objects order 22 (4096 kB objects) block_name_prefix: rb.0.13fb.6b8b4567 format: 1 [root@osd1 /] # rados ls-p myrbdrbd_ directoryrbd1.rbd [root @ osd1 /] # rbd map myrbd/rbd1 [root@osd1 /] # rbd showmappedid pool image snap device 0 myrbd rbd1 -/ dev/rbd0 [root@osd1 /] # dd if=/dev/zero of=/dev/rbd0 dd: writing to `/ dev/rbd0': No space left on device16385+0 records in16384+0 records out8388608 bytes (8.4MB) copied 2.25155 s, 3.7 MB/s [root@osd1 /] # rados ls-p myrbdrbd_directoryrbd1.rbdrb.0.13fb.6b8b4567.000000000001rb.0.13fb.6b8b4567.000000000000

$image_name.rbd: contains the id (rb.0.13fb.6b8b4567) of this block

$rbd_id.$fragment: data block

Rbd_directory: list of rbd blocks in the current pool

Rbd format2

[root@osd1 /] # rbd create myrbd/rbd1-s 8-- image-format=2 [root@osd1 /] # 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@osd1 /] # rados ls-p myrbdrbd_directoryrbd_header.13436b8b4567rbd_ id.rbd1 [root @ osd1 /] # rbd map myrbd/rbd1 [root @ osd1 /] # rbd showmappedid pool image snap device 0 myrbd rbd1-/ dev/rbd0 [root@osd1 /] # dd if=/dev/zero of=/dev/rbd0dd: writing to `/ dev/rbd0': No space left on device16385+0 records in16384+0 records out8388608 bytes (8.4 MB) copied 2.14407 s, 3.9 MB/s [root@osd1 /] # rados ls-p myrbdrbd_directoryrbd_data.13436b8b4567.0000000000000000rbd_data.13436b8b4567.0000000000000001rbd_header.13436b8b4567rbd_id.rbd1

Rbd_data.$rbd_id.$fragment: block

Rbd_directory: list of rbd blocks in the current pool

Rbd_header.$rbd_id: metadata for rbd blocks

Rbd_id.$image_name: the id (13436b8b4567) that contains this block

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