Ceph as block stor­age

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Block store is the tra­di­tional form of disk data stor­age where the data is di­vided into blocks and stored us­ing a file sys­tem. Block store is best suited for VM disk vol­ume stor­age needs, where we store large sin­gu­lar files with higher read and write fre­quen­cies. Ceph block stor­age can be well served as a SAN (stor­age area net­work) so­lu­tion.

One added ad­van­tage of Ceph is that it has thin-pro­vi­sion­ing en­abled, which helps in faster data du­pli­ca­tion and ef­fi­cient stor­age space util­i­sa­tion. When a disk stored in Ceph is repli­cated, it doesn’t oc­cupy any mem­ory for the repli­cated copy. Ceph uses the COW (copy­on­write) method where the block is repli­cated and up­dated only on write, else the block is not repli­cated.

Ama­zon’s EBS (Elas­tic Block Stor­age) is a pop­u­lar block stor­age ser­vice used gen­er­ally for vol­umes of VM in­stances.

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