SRPT is a SCSI RDMA Protocol (SRP) target implementation on top of SCST, a mid-level SCSI target subsystem for the Linux kernel. This software makes it possible for remote systems to access local storage over an InfiniBand network. This storage protocol target implementation offers a higher bandwidth and a lower latency than any other storage protocol target implementation available for Linux.
SCST is a mid-level SCSI target subsystem for Linux. This subsystem allows a remote host to access local storage devices through the SCSI protocol. SCST supports multiple network storage protocols, including iSCSI, SRP, and FCoE, and also supports Qlogic 22xx/23xx SCSI HBAs. Strong points of SCST are its stability, maturity, high performance, and low latency. See also the iSCSI-SCST, SRPT and scstqla2x00t projects, as well as open-fcoe.org.
Lsyncd watches a local directory tree's event monitor interface (inotify). It aggregates and combines events for a few seconds and then spawns one (or more) process(es) to synchronize the changes. By default, this synchronization is done with rsync. Lsyncd is thus a lightweight live mirror solution that is comparatively easy to install. It does not require new filesystems or block devices and does not hamper local filesystem performance.
The Zumastor Linux storage project adds enterprise storage features to Linux, primarily improved snapshots and remote replication. Point-in-time, near zero-cost, block level snapshots can be added to any existing filesystem and performance does not degrade with multiple snapshots. Remote replication is achieved by sending minimal block level deltas between snapshots without having to traverse the entire filesystem like rsync does.