URGENT How can I figure out EXACTLY raw disk size in KB

[Mike Rightmire]

I need to know the EXACT KB size of a raw space on some of HP drives. The lv is 2000 MB, one of two LVs in a VG. I am having difficulty as I do not know how many true KBs HP considers an MB (is it based on block size PE, ETC.)

Any help, including just the answer, would be great. These are raw data LVs.

Thx!

[Sridhar Bhaskarla · Accepted solution]

Let me see if I understood your question correctly.

I am sure you are not looking for the info returned by diskinfo /dev/rdsk/cxtydz.

If this disk is part of a volume group, the way to find the unused disk space is

do a pvdisplay /dev/dsk/cxtydz.

Multiply Free PE with PE Size
Multiply the result with 1024.

You will get the free size on the PV in K Bytes.

-Sri

[James R. Ferguson]

Hi Mike:

1K = 1024, so, 2000 MB = 2,048,000 KB

Regards!

...JRF...

[Ovidiu D. Raita]

2000 MB = 2000 * 1024 KB
For a disk use diskinfo /dev/rdsk/cXdXtX
Ovidiu

[Sridhar Bhaskarla]

If you are talking about a RAW logical volume, it would be the size of the logical volume multiplied by 1024.

So, in your case it would be 2000*1024=2048000 KB and this is what you get in bdf command for normal logical volumes.

I hope I understood your question.

-Sri

[linuxfan]

Hi Mike,


Did you already try diskinfo

diskinfo /dev/rdsk/cXtYdZ

and 1MB is always 1024KB or 1024*1024 bytes

-Regards
Ramesh

[Mike Rightmire]

Fantastic!! That's what I needed confirmed, that when it sayd 1 MB it truly is 1024 KB. That gives me the answer I need! Everyone gets 10 points and a gold star :-) !

[A. Clay Stephenson]

Hi Mike:

The MB is our usage is 2^20 (1024 * 1024); so your value is 2000 * 1024 * 1024 = 2,097,152,000 Bytes.

You are obviously confused by the 'marketing MB' which is calculated by taking the above value and dividing by 10^6 to get 2097.152MB and obviously makes our 2.1GB drive much better than your dinky 2GB drive eventhough they are exactly the same.

Regards, Clay

In your case
2000 * 1024 * 1024