2.3.3 Local Log-Structured Object Manager (LSOM)
Like the DOM, the LSOM exists in kernel space, and there are no daemons that can be monitored or restarted without booting the ESXi host. All components exist at the LSOM layer and the LSOM is responsible for handling I/O and ensuring consistency of the components resident on local disks. In addition to this, the LSOM:
• Handles write-buffering, read caching and the destaging of data to the capacity tier.
• Receives I/O from the DOM.
• Returns acknowledgements to the DOM when write operations are complete and returns payloads for read operations.
• Is unaware of distribution, quorum, I/O synchronization, and so on. The DOM addresses all of that. The LSOM is responsible only for handling I/O.