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тАО12-08-2010 09:52 PM
тАО12-08-2010 09:52 PM
we have DL380 G6 with P410 RAID controller and 146GB haard disks (Seagate ST9146803SS SAS 10 kTpm).
We configure 2 disks each in RAID1+0 configuration, and have noticed that before setting up the logical disk, the siyes of the physical disks are reported as 146GB in the ROM-based RAID setup utility.
Afterwards, the size indicated for the logical disks is somewhere around 137GB (I do not remember the exact number).
However, it is a little less than before, even thought also reported in GB.
Does anyone know for sure what causes this reduction in disk space?
Thanks in advance,
Michael
Solved! Go to Solution.
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тАО12-08-2010 10:24 PM
тАО12-08-2010 10:24 PM
Re: Reported disk size reduced after create RAID1+0
I hope this link helps you find difference between gigabyte and gibibyte value.
http://en.wikipedia.org/wiki/Gigabyte
http://www.diskview.com/disk-size-discrepancy.htm
Thanks
I work for HPE.
[Any personal opinions expressed are mine, and not official statements on behalf of Hewlett Packard Enterprise]
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тАО12-09-2010 12:54 AM
тАО12-09-2010 12:54 AM
Re: Reported disk size reduced after create RAID1+0
There is additionally some potential for confusion as some references are to a binary number and some references can be to a decimal number, as in
1K = 2^10 = 1024
1K = 1000
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тАО12-09-2010 04:34 AM
тАО12-09-2010 04:34 AM
Re: Reported disk size reduced after create RAID1+0
Thanks for responding, but this size difference is reported by RAID setup *before* an OS is installed, and in both cases the reported unit is GB.
Also, the exact figure left is reported as 136.7 GB - this does not fit a GB / GiB mismatch.
I am hoping for further clarification.
Regards,
Michael
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тАО12-10-2010 12:36 AM
тАО12-10-2010 12:36 AM
Solutionlooking at ACU with older 73 GB disks, they are reported as 72,8 GB before they are configured in an array.
When i.e. two such disk are added into an array , it reports 138928 MB available space (this is already less than 2 * 72,8 GB = 145,6 GB). If i then create a logical drive RAID0/1 within that array, i get a end result of 69463 MB.
There is always some overhead when creating an array/logical drive and sometimes there is a small amount of space left unused for optimizing performance of the array.
This has always been the case but i don't have a % of how much this takes to calculate what to expect as available space upfront.
Doing the same with two 300 GB disks, gives me 286101 MB when selecting a logical drive in raid 0/1 which is approx 4,6% less then raw capacity.
This is all without converting the GB into MB.
HTH
Kris
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тАО12-10-2010 04:20 AM
тАО12-10-2010 04:20 AM
Re: Reported disk size reduced after create RAID1+0
I thought there was some space used by the RAID itself and I had also noticed this before on disks of other sizes.
Regards,
Michael
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тАО12-12-2010 11:28 PM
тАО12-12-2010 11:28 PM