4 ms·

I wonder, what filesystem are they using. Or more general the whole software stack (what OS, etc) would be interesting to know.

• urza 10y ago
  Ah I found it on their blog: https://www.backblaze.com/blog/vault-cloud-storage-architecture/ https://www.backblaze.com/blog/vault-cloud-storage-architect... They use ext4: Each of the drives in a Vault has a standard Linux file system, ext4, on it. This is where the shards are stored. There are fancier file systems out there, but we don’t need them for Vaults. All that is needed is a way to write files to disk, and read them back. Ext4 is good at handling power failure on a single drive cleanly, without losing any files. It’s also good at storing lots of files on a single drive, and providing efficient access to them. Compared to a conventional RAID, we have swapped the layers here by putting the file systems under the replication. Usually, RAID puts the file system on top of the replication, which means that a file system corruption can lose data. With the file system below the replication, a Vault can recover from a file system corruption, because it can lose at most one shard of each file.