RAID5

  • Thread starter Thread starter Erik Janssen
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Erik Janssen

Hello,

Can anyone tell me what RAID5 means?

I know that RAID5 are used for secure backup of data, but what if I use for
example 4 harddisks each with 300GB as a RAID5 solution. What will the total
diskspace be then?

Best Regards
Erik
 
Total Drivespace available for DATA would be 900 GB.
(300 GB would be used for checksums to recreate the data in the event of a
drive failure.)
 
Hello,

Can anyone tell me what RAID5 means?
Click to expand...

google can tell you better
I know that RAID5 are used for secure backup of data,
Click to expand...

not really. Raid is a failsafe to protect availability but is not a
backup per se.
but what if I use for
example 4 harddisks each with 300GB as a RAID5 solution. What will the total
diskspace be then?
Click to expand...

Useable space RAID5 = (total number drives - 1) x (drive size)
 
Can anyone tell me what RAID5 means?
I know that RAID5 are used for secure backup of data, but what if I use for
example 4 harddisks each with 300GB as a RAID5 solution. What will the total
diskspace be then?
Click to expand...

The total disk space will be 900GB.. 300GB (or 75GB on each drive) will be used
for parity incase something happens to one or more drives and it needs to
rebuild the data.

RAID 5 means striping with parity.. slices of the data are spread across each
drive (say slices a and c on drive 1, slices b and d on drive 2, etc.), and then
the parity (error correction) is also sliced up and spread across the drive..

The best explanation I found is here:

http://www.monster-isp.com/glossary/Disk+Striping+with+Parity.html


A good diagram (but rather technically worded description) is here:

http://www.acnc.com/04_01_05.html


Regards,
Chris
 
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