On Sat, Jan 4, 2025 at 9:52 AM Vishnu ks <ksvishnu56@xxxxxxxxx> wrote: > [...] > > @Song: Our approach fundamentally differs from md/raid in several ways: > > 1. Network-based vs Local: > - Our system operates over network, allowing replication across > geographically distributed systems > - md/raid works only with locally attached storage devices md-cluster (https://docs.kernel.org/driver-api/md/md-cluster.html) does support RAID in a cluster. > > 2. Replication Model: > - We use asynchronous replication with configurable RPO windows > - md/raid requires synchronous, immediate mirroring of data immediate mirroring is probably more efficient, as the system doesn't need to read the data from the device. > 3. Recovery Capabilities: > - We provide point-in-time recovery through incremental sector tracking > - md/raid focuses on immediate redundancy without historical state IIUC, the idea is to build a block level remote full journal. By "full" journal, I mean the journal contains all the actual data in addition to metadata. I think the consistency can be really tricky with write cache etc. Thanks, Song
