3 ms·
The usage in the article is that 64/128 bits is the addressing used for the blocks. A block is 512 bytes. So a 64-bit filesystem would actually be limited to 2^
by versteegen 9y ago
The usage in the article is that 64/128 bits is the addressing used for the blocks. A block is 512 bytes. So a 64-bit filesystem would actually be limited to 2^73 bytes = 8192 EiB = 8.6 billion TiB of storage.
No cloud vendor has a billion harddisks, that's for sure.
(The filesystem might only support a maximum file size of 2^64 bytes, but that's nothing to do with the capacity of the storage array)
- wyoung2 9y agoThe article isn't talking about the size of raw disk blocks, better called the sector size. It's talking about ZFS blocks, which are variable in size, defaulting to 128 kB: https://en.wikipedia.org/wiki/ZFS#Variable_block_sizes https://en.wikipedia.org/wiki/ZFS#Variable_block_sizes ZFS aside, the 512 byte sector isn't even a hard limit at the storage medium level. Disks with 528 byte sectors — and other odd sizes — have been available in the enterprise world for a long time now: https://en.wikipedia.org/wiki/Hard_disk_drive#Market_segments https://en.wikipedia.org/wiki/Hard_disk_drive#Market_segment... HDDs and SSDs with 4 kB sectors dominate the consumer market now: https://en.wikipedia.org/wiki/Advanced_Format https://en.wikipedia.org/wiki/Advanced_Format