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Location of Hot Spare

 
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Lyman DeLiguori
Occasional Advisor

Location of Hot Spare

Does it matter which bay the Hot Spare goes into on a DL380-G3? If so, which bay?

I take that should the RAID 1+0 fail this Hot Spare will automatically be brought online?
16 REPLIES
Michael A. McKenney
Respected Contributor
Solution

Re: Location of Hot Spare

You might want two for 1+0. The location does not matter. Make sure they are marked properly to fail over to that array. You can list them as global.
Lyman DeLiguori
Occasional Advisor

Re: Location of Hot Spare

Thanks.

Marked properly where? In the config (F8) at boot where disks are setup it merely offers a choice of RAID and a checkbox if a spare is present or not.

Why would you recommend two drives as spares? The odds of both of the primaries failing would seem rather remote...
Mauricio Salas
Frequent Advisor

Re: Location of Hot Spare

The bay doesnt matter, so go to the ACU and select the HDD that you want click on Spare management, and select the array, when a HDD fail it will start the rebuilding process automatically
Lyman DeLiguori
Occasional Advisor

Re: Location of Hot Spare

Thank you very much but a couple of quick questions.

This DL380-G3 is running Windows-7 Professional which is not a listed O/S. I would suspect that Server 2003 would be the most logical choice for the ACU.

Also, do you have a link to the ACU utility for the DL380-G3?

Many thanks again for your help.
Lyman DeLiguori
Occasional Advisor

Re: Location of Hot Spare

Re: Location of Hot Spare

Hi,

The Array Configuration Utility CLI description:

The Array Configuration Utility CLI is a commandline-based disk configuration program for Smart Array Controllers and RAID Array Controllers.

There are other versions of the user interface.
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Michael A. McKenney
Respected Contributor

Re: Location of Hot Spare

RAID 1+0 are installed in pairs. You would have an unusable slot with a single spare. So I usually populate RAID 10 or 1+0 in pairs.
Lyman DeLiguori
Occasional Advisor

Re: Location of Hot Spare

Thanks Mike. So you're saying there should be one spare for each primary? (I.e., 2 Primary disks in RAID 1+0, and two Spares).

My thought was that if one of the primaries in the RAID 1+0 failed the single spare would be the failover point. No?
Michael A. McKenney
Respected Contributor

Re: Location of Hot Spare

In RAID, you don't have primary or secondary. All four drives work together. 1+0 means duplexing and striping. In SAS RAID 10, you duplex pairs of drives and then stripe the pairs. I do two spares because you add drives in pairs to RAID 1+0 or 10. You would have odd space not usable, if you fill out the enclosure. So I usually just add two spares and set them to global. You can't have too many spares or backups.
Lyman DeLiguori
Occasional Advisor

Re: Location of Hot Spare

Mike,

By 'primary' I meant physical drives 0 and 1 which are setup as RAID-10. The sole purpose of the Hot Spare is in the event one of the two disks (0 and 1) present in the system should fail. Hence my question will one Hot Spare suffice should either Drive 0 or Drive 1 fail?
Michael A. McKenney
Respected Contributor

Re: Location of Hot Spare

RAID 10, 1+0 or 0+1 are four drives. RAID 1 is 2 drives. I have never seen primary drive listed in RAID. Both drives read and write together. I used to do RAID 1 on two separate channels of the controller. When I do RAID 10 on my LSI Logic 8708EM2, I do the RAID 1 pairs from separate channels in case a channel of the controller or the cable fails.
Lyman DeLiguori
Occasional Advisor

Re: Location of Hot Spare

Mike,

Agreed re the four disk requirement. However and having said that, within the HP Option ROM Configuration for Arrays (ORCA)using the 5i controller on a DL380-G3, RAID 1+0 is actually the default with two drives and only two drives.

I cannot help but wonder at this point if in fact what ORCA states as 1+0 is in fact just a RAID 1.

Thoughts?
Michael A. McKenney
Respected Contributor

Re: Location of Hot Spare

I would agree 1+0 covers RAID 1.
Lyman DeLiguori
Occasional Advisor

Re: Location of Hot Spare

Mike,

I spoke with HP Tech Support and asked them why, with only two drives present, ORCA will default to showing 'RAID 1+0'.

(Equally ludicrous is that with just a single disk ORCA will show a default of RAID 1).

When asked why I was told "That's just the way they wrote it".

Sigh.....thanks for your help.
Michael A. McKenney
Respected Contributor

Re: Location of Hot Spare

I don't doubt HP screwed up...
Mauricio Salas
Frequent Advisor

Re: Location of Hot Spare

If you have 2 HDD, Raid 1 and Raid 1+0 is technically the same thing, so it doesnt matter, now, Windows server 2003 is like XP, 2008 is like Vista, so you can use 2003 drivers on XP and 2008 drivers on Vista, but XP, Vista and 7 are not supported, so if you get any issue, HP will ask you to install a supported OS