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02-24-2011 08:13 AM
02-24-2011 08:13 AM
Solved! Go to Solution.
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03-21-2011 12:04 AM
03-21-2011 12:04 AM
Re: MSA2000 LUN size diference from Host LUN size
Thanks for using HP forums!
Could you please converse in English? This will help everybody in the Forum understand the discussion and allow them to participate as well.
Thanks & Regards,
Rashmi
Rashmi
Forum Moderator
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03-21-2011 05:33 AM
03-21-2011 05:33 AM
Re: MSA2000 LUN size diference from Host LUN size
Steven
Don;t fault me... fault Google...
(¿Cuánto diferentes estamos hablando? Yo suelo ver un poco de discrepancia con el tamaño de la matriz con el host .. y en la MSA, que parece ser un poco más grande de lo normal, pero ¿cuánto de una diferencia estás hablando?)
HP Master ASE, Storage, Servers, and Clustering
MCSE (NT 4.0, W2K, W2K3)
VCP (ESX2, Vi3, vSphere4, vSphere5, vSphere 6.x)
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03-21-2011 06:20 AM
03-21-2011 06:20 AM
Re: MSA2000 LUN size diference from Host LUN size
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03-21-2011 06:34 PM
03-21-2011 06:34 PM
SolutionIts simple Logic. I referred some documents long back(could not able to trace now), MSA will be taken as Size in 1000 KBytes=1MB instead of 1024 KBytes =1 MB.
This resulting the less size LUN when compared with created size.
Below is one of the Informative advisory fyi.
Information
A volume created in MSA Console does not show up as the same size in Operating system.
For e.g. If a Volume in MSA created is 700GB, in Operating system it would show as 652GB volume.
Details
In the MSA console, the size defined is with a decimal (base 10). Which means, if size specified is 1000MB it is taken as 1GB.
However the file system at the OS Data capacity is calculated in binary (base 2).
Capacity comparison:
Unit MSA Data Capacity File system Data Capacity
Kbyte (KB) 1000 bytes 1024 bytes
Mbyte (MB) 1 million bytes 1,048,576 bytes
Gbyte (GB) 1 billion bytes 1,073,741,824 bytes
Tbyte (TB) 1 trillion bytes 1,099,511,627,776 bytes
Taking the above example.
700GB (in MSA) = 700,000,000,000 bytes
652GB (in OS) = 667,648 MB = 683,671,552 KB = 700,079,669,248 bytes
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03-21-2011 08:59 PM
03-21-2011 08:59 PM
Re: MSA2000 LUN size diference from Host LUN size
2GB would be about 1.86GB in th OS.
The only thing left to consider is that the "RAID" level is not applied to the array, rather the volume.
I've had to compensate for this in the pasted to get the sizes I wanted in the OS. Never had to re-visit it though... an I do;t have a MSA handy to do so now.
How many disks are configured in the disk group and what is the RAID setting?
Losing an additional 10 to 15% off the top sounds like RAID5.
Steven
HP Master ASE, Storage, Servers, and Clustering
MCSE (NT 4.0, W2K, W2K3)
VCP (ESX2, Vi3, vSphere4, vSphere5, vSphere 6.x)
RHCE
NPP3 (Nutanix Platform Professional)
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03-21-2011 09:11 PM
03-21-2011 09:11 PM
Re: MSA2000 LUN size diference from Host LUN size
If it is the space after formact then we need to consoder the overhead due to formatting the volume..