What are the types of RAID ?

Various levels of RAID exist...

RAID0 - Span

Adds the capacity of the disks together to make 1 larger volume.
Minimum 2 disks. e.g. 2*80Gb drives = 160gb volume.
Provides no redundancy - if any disk fails you lose everything.

RAID1 - Mirror

Automatically mirrors the contents of one disk to another identical drive.
Uses 2 disks. e.g. 2*80Gb drives = 80gb volume.
Provides basic redundancy - if a single drive fails it can be removed from eth RAID Array and all the data still exists of the other drive.

RAID5 - Stripe and Checksum

Stripes data across n-1 disks, using the final disk as a checksum drive.
Minimum 3 disks. e.g. 3*80Gb drives = 160gb volume.
Provides standard redundancy, if a single drive fails it can be replaced with no loss of data, as every single disk content can be rebuilt from knowing the contents of the remaining disks.

RAID6 - Stripe and Checksum with HotSpare

Stripes data across n-2 disks, using the one disk as a checksum drive and another as a standby drive.
Minimum 4 disks. e.g. 4*80Gb drives = 160gb volume.
Provides advanced redundancy, if a single drive fails it is automatically rebuilt onto the hotswap spare drive, with no loss of data or downtime, although access times are reduced during the rebuild.

RAID10 (raid1+0) - Span and Mirror

Adds the capacity of half of the disks together to make 1 larger volume. With the added failover of a complete mirror set of those drives.
Minimum 4 disks. e.g. 4*80Gb drives = 160gb volume.
Provides complete redundancy, if any drive fails, the data is simply read from the equivalent drive in the mirror set automatically. No loss of data and no downtime, although access times are not reduced as with RAID6, the failed disk can be replaced and will auto-rebuild.
  • 7 Users Found This Useful
這篇文章有幫助嗎?

相關文章

What is the typical load average on your web servers?

Load is (generally speaking) the amount of work expected from a single thread on a single core of...

Do you offer dedicated IP addresses ?

Yes we offer dedicated IPv4 and Ipv6 addresses :) With our UK Business Hosting accounts you can...

Do you allow/support Secure Socket Layer (SSL) ?

Yes, you can setup SSL on your account. To do this you need to first order (or upgrade to) a...

Can I purchase an SSL certificate from you ?

Yes, we offer very affordable SSL certificates. These start from just £25/year. This price...

Do you have speed test files that I can download ?

Yes, we do. Please go to http://speedtest.statichost.co.uk to download our speed test files.

Powered by WHMCompleteSolution