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тАО01-30-2006 04:48 PM
тАО01-30-2006 04:48 PM
Re: raid 0+1
There is a slight difference.
RAID 0+1 configuration where multiple disks are striped together into sets (sets A & B in the diagram, each set being as large as the resulting final volume), and then two or more sets are mirrored together.
RAID 1+0 configuration where two or more drives are mirrored together (mirrors 1-4 in the diagram), and then the mirrors (as many as are needed to result in the desired amount of space) are striped together.
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тАО01-30-2006 05:12 PM
тАО01-30-2006 05:12 PM
Re: raid 0+1
DEFENETLY IT IS NOT SAME
Simply
raid 0+1 ==> striping the mirrored volume
raid 1+0 ==> mirroring the striped volume
the redundancy differs in both config.
the mirror can survive a single disk failure and stripe cant.
With Regards,
Siva
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тАО01-30-2006 05:20 PM
тАО01-30-2006 05:20 PM
Re: raid 0+1
That's why I said I always talk about striped/mirrors or mirrored/stripes ;-)
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тАО01-31-2006 09:28 AM
тАО01-31-2006 09:28 AM
Re: raid 0+1
Note: If more than one pair of drives are included in a RAID 1 array, the data is
striped across the first half of the drives in the array and then each drive is mirrored to a
drive in the remaining half of the drives for fault tolerance. This method is referred to as
RAID 1+0.
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тАО03-02-2006 02:42 AM
тАО03-02-2006 02:42 AM
Re: raid 0+1
Using the CLI to create a 1+0 lun, will the MSA 1000 automatically mirror across enclosures if it can, or is the lun set-up based on the order of disks on the command line ?
Thanks,
Adrian
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тАО03-02-2006 03:26 AM
тАО03-02-2006 03:26 AM
Re: raid 0+1
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тАО03-02-2006 08:16 AM
тАО03-02-2006 08:16 AM
Re: raid 0+1
Peace!
1. 0+1 and 1+0 both gives you the same capacity
2. AS far as redundancy - 0+1 (stripe and mirror) will be able to handle more disk failures.
3. Performance - it depends on where the RAIDing is done. If RAIDing is done on the host level say - using VxVM, and you are dealing with JBOD enclosures - one RAID scheme may be better than the other performance wise.
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тАО03-03-2006 01:27 AM
тАО03-03-2006 01:27 AM
Re: raid 0+1
Please recheck your second statement.
RAID 1+0 offers more redundancy than 0+1.
RAID 0+1 will only handle a single disk failure in each mirrored set.
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тАО03-03-2006 01:36 AM
тАО03-03-2006 01:36 AM
Re: raid 0+1
Take 8 disks, carve 4 mirror sets (RAID1), stripe(RAID0) accross this 4 mirror sets and you've RAID10. You can loose 1 disk from each mirror set and your stripe stays intact.
In VxVM, you have what's called layered Volumes. You can have a stripe of stripes, s stripe or mirrors, a stripe of RAID5's, etc.. further incresing the reliability and scalability of storage.
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тАО03-03-2006 01:54 AM
тАО03-03-2006 01:54 AM