Mdadm

mdadm is a Linux utility used to manage software RAID devices.

The name is derived from the md (multiple device) device nodes it administers or manages, and it replaced a previous utility mdctl. The original name was "Mirror Disk", but was changed as the functionality increased.

It is free software licensed under version 2 or later of the GNU General Public License - maintained and copyrighted to Neil Brown of SUSE.

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Read more about Mdadm:  Mdmpd, Known Problems

Other articles related to "mdadm":

Mdadm - Known Problems - Increasing RAID5 Performance
... Note This tip assumes sufficient RAM availability to the system ... Insufficient RAM can lead to data loss/corruption echo 16384 > /sys/block/md0/md/stripe_cache_size blockdev --setra 16384 /dev/md0 Write Performance dd if=/dev/zero of=/mnt/family/10gb.16384k.stripe.out bs=1M count=10240 10240+0 records in 10240+0 records out 10737418240 bytes (11 GB) copied, 94.5423 s, 114 MB/s Read Performance dd if=/mnt/family/10gb.16384k.stripe.out of=/dev/null bs=1M 10240+0 records in 10240+0 records out 10737418240 bytes (11 GB) copied, 28.5435 s, 376 MB/s These changes must be done on any reboot (add to an init script to set on start-up) ...