EVA4400. 400Gb disks seen as 370Gb disks.

[ALEXANDER MORA]

Hi. Perhaps one of you guys have seen this.
We have a new EVA4400. It comes with 10, 400Gb FATA hard drives. The command View reports 3.7Tb available, RAW. Since we understand it shoud be seeing 4Tb. We think it could be because of the disks or the controllers firmware and will make the upgrade tomorrow but perhaps someone can say something about it.
Thanks for your help.
Alex

[Uwe Zessin · Accepted solution]

Alex,
this is not a problem - this is just the difference between 'Hardware GigaBytes' and 'Software GigaBytes'.

The disk drive vendor calculates the size by multiplying the block size (512 bytes) by the number of blocks, divide by 1,000,000,000 (=1000 * 1000 * 1000 = 10^9) and prints the result on the disk drive.

Command View EVA takes the number of blocks and divides the result by 1,073,741,824 (= 1024 * 1024 * 1024 = 2^30).

So 400 HWGB / (1.024 / 1.024 / 1.024)
gives about 372.5 SWGB.

[ALEXANDER MORA]

That answers my question. And that's exactly the size the command view reports. Thank you very much!!!