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hide sidebar Feature List Membership courtesy of the CI project includes libcluster and the cluster command (part of Cluster Tools) Internode Communication courtesy of the CI project Filesystem CFS is transparently stacked over any ext3 mount, making it instantly and coherently shared across the cluster CFS can be used for the root and other filesystems there is mount enforcement across nodes in the cluster so an NFS mount on any node is automatically done on all nodes; reopen of files, devices, ipc objects when processes move is supported CFS supports file record locking and shared writable mapped files (along with all other standard POSIX capabilities HA-CFS is configurable for the root or other filesystems Lustre is supported; openGFS was supported but is not currently GFS will be supported in OpenSSI 2.x but is not currently supported Process Management very complete, including: clusterwide PIDs process migration and distributed rexec(), rfork() and migrate() with reopen of files, sockets, pipes, devices, etc. vprocs clusterwide signalling, get/setpriority capabilities distributed process groups, session, controlling terminal surrogate origin functionality no single points of failure (cleanup code to deal with nodedowns) Load leveling at exec() time and during process execution clusterwide ptrace() and strace clusterwide /proc/<pid>, ps, top, etc. threaded processes migrate as a group process groups can migrate as a group Devices there is a clusterwide device model via the devfs code each node mounts its devfs on /cluster/node#/dev and bind mounts it to /dev so all devices are visible and accessible from all nodes, but by default you see only local devices a process on any node can open a device on any node devices are reopened when processes move processes retain a context, even if they move; the context determines which node's devices to access by default single, clusterwide /dev/pts IPC all IPC objects/mechanisms are clusterwide: pipes fifos signalling message queues semaphore shared memory Unix-domain sockets Internet-domain sockets reopen of IPC objects is there for process movement nodedown handling is there for all IPC objects Clusterwide TCP/IP HA-LVS is integrated, with extensions extension is that port redirection to servers in the cluster is automatic and doesn't have to be managed. Paging/Swapping not clusterwide each node is independent Kernel Data Replication Service it is in there (cluster/ssi/clreg) no subsystems are using it CLVM/EVMS not there Shared Storage we have tested shared FCAL and use it for HA-CFS HA interconnect Bonding is supported DLM is integrated with CLMS and is HA Sysadmin services architecture has been made clusterwide ps, top, ipcs are clusterwide by default localview command can limit view to local node Init, Booting and Run Levels system runs with a single init which will failover/restart on another node if the node it is on dies Application Availability application monitoring/restart provided by spawndaemon/keepalive services started by RC on the initnode will automatically restart on a failure of the initnode Timesync NTP for now Load Leveling for connection load balancing, using HA-LVS process load leveling is on by default process load leveling can occur at exec() time or during execution applications must be registered to load level Packaging/Install Have source patch, binary RPMs and CVS source options; Can also build Debian packages from CVS source; First node is incremental to a standard Linux install Other nodes install via netboot, PXEboot, DHCP and simple addnode command; Object Interfaces standard interfaces for objects work as expected no new interfaces for object location or movement except for processes (rexec(), migrate(), and /proc/pid/goto to move a process)

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This page last updated on Wed Jan 12 01:15:26 2005 GMT
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