Is there any difference b/w checksum in ZFS as compared to few other filesystems which also provide 64 bit checksum ?
Data is protected by 256 bit checksum in ZFS – Only FileSystem to have 256 Bit Checksum. ZFS checksums both metadata and data blocks. Additionally they are cryptographic hashes, SHA-256 .Which allows for neat tricks where one top level checksum can be used to essentially give a hash of the entire block tree. This can be combined with PGP sigs. And add to that that the checksum in ZFS is always store with the indirect block not with the data, the only time ZFS stores data and checksum in the same block is in the uberblock as there are no indirect blocks pointing to it This I believe is major difference between ZFS and other filesystems that does checksums.
