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RAID 1 - Highest disk overhead


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#1 Thoth_Dhwty

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Posted 28 October 2016 - 08:08 AM

 Could anyone explain to me what does "highest disk overhead" mean in a RAID 1 ?

 

 I came across this question while doing some CompTia tests and I really don't get what does it refer to.

 

 Thanks!



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#2 Kilroy

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Posted 28 October 2016 - 02:39 PM

Highest disk usage?  RAID 1 is disk mirroring, so any time a change is made all disks will have to make the same change at the same time.

 

RAID: An In-Depth Guide



#3 Thoth_Dhwty

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Posted 30 October 2016 - 05:45 AM

 So how come RAID 1 has more disk usage than RAID 10 or 0+1 which involve 4 disks as minimum and the disks are both striped and mirrored ? Just wondering :|



#4 Kilroy

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Posted 31 October 2016 - 11:17 AM

Because in RAID 0 and RAID 10 only half of the information is being written to any one drive.  All RAID, except RAID 1, only have a portion of the data on them. RAID 1 which has all information on both drives and is more disk intensive (Disk Overhead).



#5 Thoth_Dhwty

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Posted 31 October 2016 - 11:21 AM

 Ah that makes sense now. Thanks for clarifying it to me!






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