only two types of requests fall into this category: * * 1. Read-ahead requests * 2. Asynchronous direct I/O requests * * Read-ahead requests are generated (if max_readahead is * non-zero) * when it anticipates that userspace will soon read more * data.© XXX Page 12 of 33 * * Asynchronous direct I/O requests are generated if * FUSE_CAP_ASYNC_DIO is enabled and userspace submits a synchronous and * buffered) userspace read/write requests (limited to one per * thread), asynchronous read requests (Linux's io_submit(2) * call actually blocks, so these are also limited to one

object storage which supports S3 apis. Therefore, there is no limit of snapshots l Support asynchronous and incremental snapshot l Support lazy (pre-allocated space) and non-lazy (allocated space