Free raid software for linux

RAIDmon2 is a script to monitor Dells PERC/4 RAID controller with SNMP.

It uses X-window (Tk at version 2.2, GTK in older ones) or STDOUT as output.

Raidmonitor monitors your linux raid devices (/proc/mdstat). It can send you a mail when something goes wrong, or show the current status in a window.

Raidmonitor is built using pccts for the parser generation and gtkmm for the GUI.

Kerrighed project is a Single System Image operating system for clusters. Kerrighed offers the view of a unique SMP machine on top of a cluster of standard PCs.
The goals of Kerrighed are high performance of applications, high availability of the cluster, efficient resources management, high customizability of the operating system and ease of use.
Kerrighed is implemented as an extension to Linux operating system (a set of Linux modules and a small patch to the kernel).
Main features:
Customizable Cluster Wide Process Scheduler.
- Processes and threads are automatically scheduled over the cluster nodes to balance the CPU load using the Kerrighed default scheduling algorithm. However, Kerrighed offers a toolkit to easily write customized schedulers hot-loadable through kernel modules.
Cluster Wide Shared Memory.
- Threads and System V memory segments can operate through the whole cluster, just like on an SMP machine.
High Performance Stream Migration Mechanism.
- Processes using streams (socket, pipe, fifo, char device, etc) can be migrated with no penalty on communication performance after migration.
Distributed File System.
- A unique file name space is seen over the whole cluster. All cluster disks are merged in an unique virtual disk in a customizable RAID-like fashion.
Process Checkpointing.
- Processes can be checkpointed and restarted on any cluster node.
Full Posix Thread Interface.
- The full Posix Thread interface can operate with threads spread over cluster nodes.
Cluster Wide Unix Process Interface.
- All traditional UNIX process management commands (top, ps, kill, etc) operate cluster wide. Moreover, process identifiers (pid) are unique cluster wide.
Customizable Single System Image Features.
- Single system image features (shared memory, global scheduler, migrable streams, etc) can be enabled or desabled on a per process basis.
Enhancements:
- The main changes are a port to the 2.6.20 Linux kernel, replacing the old communication layer with TIPC, and fixes for numerous bugs.

FreeBSD is an advanced operating system for x86 compatible (including Pentium and Athlon), amd64 compatible (including Opteron, Athlon 64, and EM64T), IA-64, PC-98, Alpha/AXP and UltraSPARC architectures.
It is derived from BSD, the version of UNIX developed at the University of California, Berkeley. It is developed and maintained by a large team of individuals. Additional platforms are in various stages of development.
FreeBSD offers advanced networking, performance, security and compatibility features today which are still missing in other operating systems, even some of the best commercial ones.
FreeBSD makes an ideal Internet or Intranet server. It provides robust network services under the heaviest loads and uses memory efficiently to maintain good response times for thousands of simultaneous user processes.
The quality of FreeBSD combined with todays low-cost, high-speed PC hardware makes FreeBSD a very economical alternative to commercial UNIX workstations. It is well-suited for a great number of both desktop and server applications.
FreeBSD can be installed from a variety of media including CD-ROM, DVD-ROM, floppy disk, magnetic tape, an MS-DOS partition, or if you have a network connection, you can install it directly over anonymous FTP or NFS.
While you might expect an operating system with these features to sell for a high price, FreeBSD is available free of charge and comes with full source code.
It is easy to contribute to FreeBSD. All you need to do is find a part of FreeBSD which you think could be improved and make those changes (carefully and cleanly) and submit that back to the Project by means of send-pr or a committer, if you know one. This could be anything from documentation to artwork to source code.
Even if you are not a programmer, there are other ways to contribute to FreeBSD. The FreeBSD Foundation is a non-profit organization for which direct contributions are fully tax deductible.
Main features:
- A merged virtual memory and filesystem buffer cache continuously tunes the amount of memory used for programs and the disk cache. As a result, programs receive both excellent memory management and high performance disk access, and the system administrator is freed from the task of tuning cache sizes.
- Compatibility modules enable programs for other operating systems to run on FreeBSD, including programs for Linux, SCO UNIX, and System V Release 4.
- Soft Updates allows improved filesystem performance without sacrificing safety and reliability. It analyzes meta-data filesystem operations to avoid having to perform all of those operations synchronously. Instead, it maintains internal state about pending meta-data operations and uses this information to cache meta-data, rewrite meta-data operations to combine subsequent operations on the same files, and reorder meta-data operations so that they may be processed more efficiently. Features such as background filesystem checking and file system snapshots are built on the consistency and performance foundations of soft updates.
- File system snapshots, permitting administrators to take atomic file system snapshots for backup purposes using the free space in the file system, as well as facilitating background fsck, which allows the system to reach multiuser mode without waiting on file system cleanup operations following power outages.
- Support for IP Security (IPsec) allows improved security in networks, and support for the next-generation Internet Protocol, IPv6. The FreeBSD IPSEC implementation includes support for a broad range of accelerated crypto hardware.
- Out of the box support for IPv6 via the KAME IPv6 stack allows FreeBSD to be seamlessly integrated into next generation networking environments. FreeBSD even ships with many applications extended to support IPv6!
- Multi-threaded SMP architecture capable of executing the kernel in parallel on multiple processors, and with kernel preemption, allowing high priority kernel tasks to preempt other kernel activity, reducing latency. This includes a multi-threaded network stack and a multi-threaded virtual memory subsystem. With FreeBSD 6.x, support for a fully parallel VFS allows the UFS file system to run on multiple processors simultaneously, permitting load sharing of CPU-intensive I/O optimization.
- M:N application threading via pthreads permitting threads to execute on multiple CPUs in a scaleable manner, mapping many user threads onto a small number of Kernel Schedulable Entities. By adopting the Scheduler Activation model, the threading approach can be adapted to the specific requirements of a broad range of applications.
- Netgraph pluggable network stack allows developers to dynamically and easily extend the network stack through clean layered network abstractions. Netgraph nodes can implement a broad range of new network services, including encapsulation, tunneling, encryption, and performance adaptation. As a result, rapid prototyping and production deployment of enhanced network services can be performed far more easily and with fewer bugs.
- TrustedBSD MAC Framework extensible kernel security, which allows developers to customize the operating system security model for specific environments, from creating hardening policies to deploying mandatory labeled confidentiality of integrity policies. Sample seucrity policies include Multi-Level Security (MLS), and Biba Integrity Protection. Third party modules include SEBSD, a FLASK-based implementation of Type Enforcement.
- GEOM pluggable storage layer, which permits new storage services to be quickly developed and cleanly integrated into the FreeBSD storage subsystem. GEOM provides a consistent and coherrent model for discovering and layering storage services, making it possible to layer services such as RAID and volume management easily.
- FreeBSDs GEOM-Based Disk Encryption (GBDE), provides strong cryptographic protection using the GEOM Framework, and can protect file systems, swap devices, and other use of storage media.
- Kernel Queues allow programs to respond more efficiently to a variety of asynchronous events including file and socket IO, improving application and system performance.
- Accept Filters allow connection-intensive applications, such as web servers, to cleanly push part of their functionality into the operating system kernel, improving performance.

srcat project can retrieve data from disks once used in a Coraid SR (SATA+RAID) appliance.
Enhancements:
- This initial alpha release retrieves data from disks that previously composed a clean RAID 5 in a Coraid SR.
- The retrieval takes place on a POSIX platform, independently of the SR unit.
- Support for RAID arrays missing disks and for levels besides RAID 5 has yet to be added.

Proxmox Mail Gateway project addresses the full spectrum of unwanted e-mail traffic, focusing spam and virus detection.
E-mail security begins at the gateway by controlling all incoming and outgoing e-mail messages. Proxmox Mail Gateway addresses the full spectrum of unwanted e-mail traffic, focusing spam and virus detection.
Proxmox Mail Gateway uses a wide variety of local and network tests to identify spam signatures. This makes it harder for spammers to identify one aspect which they can craft their messages to work around.
Every single e-mail will be analyzed and gets a spam score assigned. The systems attempt to optimize the efficiency of the rules that are run in terms of minimizing the number of false positives and false negatives.
The flexible architecture combined with the easy-to-use configuration interface safeguards companies against existing and new e-mail threats.
Main features:
- Advanced spam detection
- Virus removal including phising e-mails
- Automatic update of virus signature database
- Automatic installation within minutes
- Support for standard PC / Server hardware (i386)
- SCSI and SCSI raid support
- Secure web based configuration
- Object-oriented rulesystem
- Attachment blocking
- Advanced statistics
- Daily reports

GNU Parted is a program for creating, resizing, destroying, checking and copying partitions, and the file systems on them. This is useful for creating space for new operating systems, reorganising disk usage, copying data between hard disks and disk imaging.
Supported disk labels: raw access (useful for RAID and LVM), MS-DOS partition tables, Intel GPT partition tables, MIPS partition tables, PC98 partition tables, Sun and BSD disk labels and Macintosh partition maps.
Notes:
- For ext2, ext3 and reiserfs: the start of the partition must stay fixed.
- For ext2, ext3: the partition you copy to must be bigger or exactly the same size as the partition you copy from.
- For ext2 and ext3: the checking is limited to ensuring the resize and copy commands will be ok.
- For fat: the size of the new partition after resizing or copying is restricted by the cluster size. Parted can shrink the cluster size, so you can always shrink your partition. However, if you cant use FAT32 for some reason, you may not be able to grow your partition.
- Parted supports both FAT16 and FAT32. Parted can convert file systems between FAT16 and FAT32, if necessary.
- Reiserfs support is enabled if you install libreiserfs.