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This article mainly shows you "ceph how to check the true size of rbd blocks", the content is easy to understand, well-organized, hope to help you solve your doubts, the following let Xiaobian lead you to study and learn "ceph how to view the true size of rbd blocks" this article.

The true size of the rbd block

Because ceph uses thin provisioning, the corresponding blocks are allocated only when the data is written. So when we create a large block, it is also done instantly, because except for some metadata, ceph does not allocate the corresponding space. So how big is the rbd block we created? Take my environment as an example:

[root@osd1 /] # rbd ls myrbdhello.txtrbd1 [root@osd1 /] # rbd info myrbd/rbd1rbd image 'rbd1': size 1024 MB in 256 objects order 22 (4096 kB objects) block_name_prefix: rbd_data.13446b8b4567 format: 2 features: layering [root@osd1 /] # rbd diff myrbd/rbd1 | awk' {SUM + = $2} END {print SUM/1024/1024 "MB"} '14.2812 MB [root@osd1 /] # rbd diff myrbd/rbd1Offset Length Type 0 131072 data 4194304 16384 data 130023424 16384 data 260046848 16384 data 390070272 16384 data 520093696 4194304 data 5242880004194304 data 528482129920 data 650117120 16384 data 780140544 16384 data 910163968 16384 data 1040187392 16384 data 1069547520 4194304 data is all the content of the article "how ceph checks the true size of rbd blocks" Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!

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