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тАО07-15-2003 02:12 AM
тАО07-15-2003 02:12 AM
Dagmar: "AutoRAID restore"
http://forums.itrc.hp.com/cm/FamilyHome/1,,117!1!2,00.html
Just to expose my ignorance !!
It got me thinking about a a situation we've been asked about recently
If you have a remote site without I.T. skills
Where they may only get a I.T. skilled visit once a week
Is it possible to have the spare disc installed & recognised as a spare in the AutoRAID?
I have this notion that upon disc failure the AutoRAID would automatically do a restore to the spare
No need for the I.T. illiterate [such as me]
To have to put in the disc
No need to remove the failed one right then
I suppose I'm also asking about availability if an automatic restore were possible in the way I describe I can think of lots of reasons why this could be a recipe for disaster - just an idea though
Mike "humble mode" Fisher
Solved! Go to Solution.
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тАО07-15-2003 02:34 AM
тАО07-15-2003 02:34 AM
Solutionthen you could insert your *cold* spare
and when you need it you would manually INCLUDE this spare to allow for complete redundancy.
Though, this is not the way it was designed, I think it should work fine as long as you are willing to pay the extra disk.
Take into account that the AutoRaid can use disks of different sizes (up to 36GB)
Regards,
Bernhard
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тАО07-15-2003 02:36 AM
тАО07-15-2003 02:36 AM
Re: AutoRAID restore II
The AutoRAID has a "hot spare" capability. One (or more) of the disks are designated as "hot spares" and utilized as replacements in the event of a disk failure. To me, the key is that someone has to recognize that the failure has occurred, because you've still got to replace the faulty disk.
Pete
Pete
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тАО07-15-2003 02:40 AM
тАО07-15-2003 02:40 AM
Re: AutoRAID restore II
Actually, that last wasn't technically correct - AutoRAID doesn't reserve disk(s) for use as "hot spares", it reserves capacity "enough to rebuild the largest disk in the array. Until needed, the array uses the Active Hot Spare capacity as RAID 0/1 space to improve performance. The capacity for the Active Hot Spare is distributed across all the disks in the array." Quoting from the "HP Disk Array with AutoRAID User's Guide".
Pete
Pete
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тАО07-15-2003 03:33 AM
тАО07-15-2003 03:33 AM
Re: AutoRAID restore II
In a nutshell
Human intervention at the time will be required
Right?
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тАО07-15-2003 03:43 AM
тАО07-15-2003 03:43 AM
Re: AutoRAID restore II
Human intervention will be required. The idea behind the "hot spare" is that the intervention doesn't have to happen immediately. However, a second disk failure could lead to disaster so it's best to replace the failed disk as soon as possible.
Pete
Pete
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тАО07-15-2003 03:44 AM
тАО07-15-2003 03:44 AM
Re: AutoRAID restore II
So i guess it depends whether your customer can work ok with the reduced performance until the disk is swapped.
I think ;)
Ta
George
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тАО07-16-2003 02:04 AM
тАО07-16-2003 02:04 AM
Re: AutoRAID restore II
What's AHS - active hot spare - is a space which is reserved in case of disk failure autoraid will be able to rebuild and there will be no 'permanent' (until failed drive will be replaced) redundancy loss.
Situation: autoraid loses one disk. Autoraid rebuilds data. After rebuild the layout as the following: AHS is still active, but you can create only LUN of size less than 36GB as you could before disk failed. Then autoraid is ready for next disk failure... etc.
Finally, when there will be no enough space to grab from 'free space' for rebuild AHS space will be used. Rebuild will complete successfully, but AHS will be disabled then. If then one more disk fail, then there will be NO AHS and NO space to rebuild, and array will be recovering using RAID algorithms (warning state). If then one more disk fails, then it's data loss
Eugeny
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тАО07-16-2003 02:27 AM
тАО07-16-2003 02:27 AM
Re: AutoRAID restore II
Very clear - you should be a teacher
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тАО07-16-2003 02:35 AM
тАО07-16-2003 02:35 AM
Re: AutoRAID restore II
Eugeny