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Re: VMware ESXi中的快照技术COW or ROW?


The child disk, which is created with a snapshot, is a sparse disk. Sparse disks employ the copy-on-write (COW) mechanism, in which the virtual disk contains no data in places, until copied there by a write. This optimization saves storage space. The grain is the unit of measure in which the sparse disk uses the copy-on-write mechanism. Each grain is a block of sectors containing virtual disk data. The default size is 128 sectors or 64 KB.

我也没有在它处看到更多关于VMware快照COW的更详细解释。相比之下,EMC CLARiiON快照的COFW (Copy-On-First-Write)就清楚多了。

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