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05-13-2003 11:54 AM
05-13-2003 11:54 AM
Thanks for any help.
--- Disk space usage --------------------
1. Total physical = 156298 MB *
2. Allocated to LUNs = 110562 MB *
3. Used as Active Hot spare = 17366 MB *
4. Used by non-included disks = 0 MB *
5. Used for Redundancy = 28370 MB *
6. Unallocated (avail for LUNs) = 0 MB *
-----------------------------------------
Solved! Go to Solution.
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05-13-2003 12:06 PM
05-13-2003 12:06 PM
Re: disk array questions
The "Used for redundancy" is the parity information which is needed to recteate the information in case of a disk failure. This information takes some of the useable disk space. If you add the Allocated and the active hot spare (the useabel space) and compare with the total there is some GB missing. This is the Redundancey.
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05-13-2003 12:07 PM
05-13-2003 12:07 PM
Re: disk array questions
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05-13-2003 01:41 PM
05-13-2003 01:41 PM
Re: disk array questions
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05-13-2003 01:58 PM
05-13-2003 01:58 PM
Re: disk array questions
Unfortunately, you have made the classic mistake for AutoRAIDS and allocated all the space for LUN's. For best performance, no more than around 50% of the capacity should be allocated. The arrtay will then run in RAID 1/0 at all times. You at least have active hot spare enabled so that that space is used for additional 1/0 space. In your configuration, about 10% (the most recently used) data is kept in RAID 1/0 while the remainder is RAID5 - with considerably more overlead and thus less performance.
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05-14-2003 04:09 AM
05-14-2003 04:09 AM
Re: disk array questions
This value is going to change the more you use the array (the more data is on it that is) The data is duplicated (mirrored) in a R1/0 style, which has good perf for RAID, but poor disk efficiency (doubled data), Raid 5 is a comprimise on disk efficiency versus performance. It is a parity based raid and thus requires controllers to calculate (resulting in slower io)
The autoraid decides which data goes in which raid level. It is nice you use the Active Hot Spare, this is used to store in R1/0, if you really need more space you can disactivate HS and use it as LUN capacity.. with the detriment of course of performance.....
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05-14-2003 11:01 AM
05-14-2003 11:01 AM
Re: disk array questions
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05-15-2003 11:47 AM
05-15-2003 11:47 AM
Re: disk array questions
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05-15-2003 11:51 AM
05-15-2003 11:51 AM
Re: disk array questions
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05-15-2003 11:54 AM
05-15-2003 11:54 AM
Re: disk array questions
What can i do to speed things up with?
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05-15-2003 01:02 PM
05-15-2003 01:02 PM
Re: disk array questions
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05-16-2003 12:15 AM
05-16-2003 12:15 AM
Solutionhttp://forums.itrc.hp.com/cm/QuestionAnswer/1,,0xf03863f96280d711abdc0090277a778c,00.html
it will describe some performance settings.
However, for real performance benefits, a correct lvm lun access is the way.. ie access lun 0 thru X, access lun 1 thru Y. that way load is balanced across 2 scsi busses and you don't end up with one bus idle.
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