of a failure). For all software RAID solutions on HP workstations, redundancy can be restored only after the
system is shut down so that the failed drive can be replaced. This replacement requires only a minimum
amount of work.
Performance considerations
Disk I/O bandwidth is typically limited by the system bus speeds, the disk controller, and the disks
themselves. The balance of these hardware limitations, as affected by the software configuration, determines
the location of the any bottleneck is in the system.
Several RAID levels offer improved performance relative to stand-alone disk performance. If disk throughput
is restricted because of a single disk controller, RAID can probably do little to improve performance until
another controller is added. Conversely, if raw disk performance is the bottleneck, a tuned software RAID
solution can dramatically improve the throughput. The slower disk performance is, relative to the rest of the
system, the better RAID performance will scale, because the slowest piece of the performance pipeline is
being directly addressed by moving to RAID.
Configuring software RAID
See the following sites for additional information about configuring software RAID:
●
Red Hat Enterprise Linux 7—See the Storage Administration Guide at
https://access.redhat.com/
documentation/en-US/Red_Hat_Enterprise_Linux/7/html/Storage_Administration_Guide/index.html
●
Red Hat Enterprise Linux 6—See the Storage Administration Guide at
http://docs.redhat.com/docs/en-
US/Red_Hat_Enterprise_Linux/6/html/Storage_Administration_Guide/index.html
●
Red Hat Enterprise Linux 5—See the Deployment Guide at
http://docs.redhat.com/docs/en-US/
Red_Hat_Enterprise_Linux/5/html/Deployment_Guide/ch-raid.html
.
●
SLED 12—See the Deployment Guide at
https://www.suse.com/documentation/sled-12/
book_sle_deployment/data/sec_yast2_system_raid.html
.
●
SLED 11—See the Deployment Guide at
http://www.suse.com/documentation/sled11/
book_sle_deployment/?page=/documentation/sled11/book_sle_deployment/data/
book_sle_deployment.html
.
●
Ubuntu 14.04 LTS—See the Server Guide at
https://help.ubuntu.com/lts/serverguide/advanced-
installation.html
or the Community Wiki at
https://help.ubuntu.com/community/Installation/
SoftwareRAID
.
For more information about Open Source and Linux at HP, go to
http://h10018.www1.hp.com/wwsolutions/
linux/index.html
.
Software RAID solution
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