ProLiant Servers (ML,DL,SL)
cancel
Showing results for 
Search instead for 
Did you mean: 

Raid 1+0 with incongruous drives

Taraka_1
Occasional Visitor

Raid 1+0 with incongruous drives

I have two HP DL380 G4 Servers that where initially setup in 1+0 raid configuration but only had 2 x 146 GB Drives each. Later two more 300 GB drives where purchased and put in each system.

I want to utilize all the space possible but I need to move some drives around. My systems currently setup looks like this:

System 1: slot 0 & 1 have 146 GB Drives; slots 2 & 3 have 300 GB Drives.

System 2: Slots 0 & 1 have 146 GB Drives; slots 2 & 3 have 300 GB Drives.

I would like to move all the 146 GB drives to System 1 and all the 300 GB drives to system 2.

My question is: What will happen if I swap these drives around and will the raid rebuild on the disks previously from another system?

Thanks!
5 REPLIES
Mi6t0
Trusted Contributor

Re: Raid 1+0 with incongruous drives

Originally the raid information stays in the RIS part of the HDDs.

If you don't want to loose some information or to avoid rebuilds, swap the HDDs in pairs :) Just pull out HDDs 2 and 3 and change them with the two disks from the other servers.

Note that both servers have to use the same controller.

Regards
Taraka_1
Occasional Visitor

Re: Raid 1+0 with incongruous drives

Thank you for the response. Both systems have identical hardware with a 6i controller.

If I remove the two 300 GB drives from system 1 and place them in system 2 in slots 0 & 1 (which replaces the 146 GB drives) the drives will funtion properly? Will I be able to see all 300 GB of space given that the original drives where only 146 GB? It will rebuild from the original drives and not the two I pulled from the other system, correct? I don't want to end up with two identical system :)
Mi6t0
Trusted Contributor

Re: Raid 1+0 with incongruous drives

Well the idea of moving the drives in pairs is to avoid the rebuild process.

But... I am not sure - are all the 4 HDDs a part of the array ot you have a seperate array for every HDD pair. The scenario that I advised will work if you have array per every HDD-pair. In this case you won't have troubles.

Can you tell how your array is configured?
KarloChacon
Honored Contributor

Re: Raid 1+0 with incongruous drives

hi

yes what is the RAID configuration in system 1 and 2? two RAID 1+0?

I suppose 146 HDDs have the boot (OS) for this servers?

I mean if you just swap HDDs what of the server won't have OS and I don't know about the amount of data but data from 300 GB won't fit 146 GB

Regards
Didn't your momma teach you to say thanks!
Taraka_1
Occasional Visitor

Re: Raid 1+0 with incongruous drives

Both systems are setup raid 1+0 with all 4 drives as part of a single array. From what I understand the 6i controller has a single channel and limits me to a single array.

Initially, each system had just the two 146GB drives and where setup as raid 1+0. When the four 300GB drives where added to both systems (two per box) they could only be added to the existing array. What this did was give me a total of 300 GB of space per box even though I had 2x146 & 2x300GB per system.

At the time we didn't realize that we had only a single array channel to work with. So I can only think of one way to utilize all the space these drives offer and that is to combine all the 146GB drives in system 1 and all the 300 drives in system 2. But... I want to do this without losing either system.

System 1 will probably be easy. The two 146 drives in slots 0 & 1 will remain, pull the two 300 drives out and replace them with the 146 drives from system two. add them to the array and off I go.. I think?

System two will be left with two 300 drives in slot 2 & 3 as the two 146 will be pulled and placed in system 1. At this point, what can I do with system 2? Can I move the 300 drives to slot 0 & 1, recover all the 300 GB of space in the array then add the other two 300 drives?

I apologize if I am not making much sense.