RAID 10 on Dell PowerEdge 2900

I have a Dell PowerEdge Server 2900 with an PERC 5/I Integrated Controller.

It has been running using RAID 10 across 8 disks. As I understand it this is basically 4 sets of mirrored disks combined to give 1 virtual disk.

1 disk on 1 of the mirrored arrays has failed. Usually when the faulty disk is replaced the controller rebuilds the array and all is well.

However, this has not happened. The disk id now showing as Ready but the disk which was part of the original mirror is on its own.

I am using the Dell Server Manager to see this and cannot find a way to rebuild the mirror and thereby the RAID 10 array.

Any ideas how I do this?
Optima SystemsNetwork EngineerAsked:
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Justin YeungConnect With a Mentor Senior Systems EngineerCommented:
did you try to set the drive as hot spare?
Justin YeungSenior Systems EngineerCommented:
if the disk was used previously on other array, you will have to remove "foreign configuration" before the process of auto rebuild.
Optima SystemsNetwork EngineerAuthor Commented:
the new replacement disk was brand new.
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Optima SystemsNetwork EngineerAuthor Commented:
no I didn't . Will this definitely make it a mirror of the drive which is now a sigle drive rather than a mirrored disk?
Justin YeungSenior Systems EngineerCommented:
No harm at all
Optima SystemsNetwork EngineerAuthor Commented:
I am sorry but your answer doesn't address my question. If I turn this into a hot spare how does it know that it is assigned to the single drive left from the damaged disk.

Is it not possible to recreate the original mirror and effectively rebuild the entire RAID 10 array again?
Seth SimmonsSr. Systems AdministratorCommented:
that is the purpose of a hot spare
it will automatically start generating a rebuild on it when a drive fails
if you don't have a hot spare and no monitoring, etc. to know that the drive failed and the array degraded, you prolong your single-point of failure and risk total loss of the array

justin's comment is correct
setting that drive to a hot spare will rebuilt that array pair
Optima SystemsNetwork EngineerAuthor Commented:
worked perfectly. Once the disk was a hot spare it sorted the whole thing out.

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