> For the complete documentation index, see [llms.txt](https://prosbcdocs.telcobridges.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://prosbcdocs.telcobridges.com/tmedia-documentation/server-and-os-administration/raid.md).

# RAID

## Raid

We recommend [HarwareRaid](http://en.wikipedia.org/wiki/RAID#Hardware-based), [RAID 1](http://en.wikipedia.org/wiki/RAID_1#RAID_1) or [RAID 5](http://en.wikipedia.org/wiki/RAID_5#RAID_5), to build disk failure tolerant servers. Be careful not to buy servers with [FakeRAID](http://en.wikipedia.org/wiki/Fakeraid). Vendors are advertising their servers as [RAID](http://en.wikipedia.org/wiki/RAID) servers, but make sure that it is true [HarwareRAID](http://en.wikipedia.org/wiki/RAID#Hardware-based), or else it could be preferable to buy your servers with no [RAID](http://en.wikipedia.org/wiki/RAID) at all, and use [Linux Software Raid](http://en.wikipedia.org/wiki/Non-standard_RAID_levels#Linux_MD_RAID_10) instead.

### FakeRaid

[FakeRAID](http://en.wikipedia.org/wiki/Fakeraid) is the equivalent of not having [RAID](http://en.wikipedia.org/wiki/RAID) at all, since it's the BIOS that emulates the RAID and thus, the CPU ends up doing all the job.

Under Linux, if you have a server with [FakeRAID/BiosRAID](http://en.wikipedia.org/wiki/Fakeraid), then you should disable it in the BIOS and use [Linux SoftwareRaid](http://en.wikipedia.org/wiki/Non-standard_RAID_levels#Linux_MD_RAID_10).

A list of [FakeRAID](http://en.wikipedia.org/wiki/Fakeraid) hardware devices/controllers can be found here <http://linuxmafia.com/faq/Hardware/sata.html>

### Linux SoftwareRaid

For servers without [RAID](http://en.wikipedia.org/wiki/RAID) or with [FakeRAID](http://en.wikipedia.org/wiki/Fakeraid), [SoftwareRaid](http://en.wikipedia.org/wiki/Non-standard_RAID_levels#Linux_MD_RAID_10) should be used.

[SoftwareRaid](http://en.wikipedia.org/wiki/Non-standard_RAID_levels#Linux_MD_RAID_10) is better than [FakeRAID](http://en.wikipedia.org/wiki/Fakeraid) because it is well supported under Linux. The kernel supports it natively, and [mdadm](http://en.wikipedia.org/wiki/Mdadm) can be used to manage and to view the status of the [RAID](http://en.wikipedia.org/wiki/RAID) devices.

Please see your Linux distribution documentation on how to setup [SoftwareRaid](http://en.wikipedia.org/wiki/Non-standard_RAID_levels#Linux_MD_RAID_10).


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