nibbles & bits?
sounds like a pet food !
HAPPY FRIDAY :)
-----Original Message-----
From: [log in to unmask] [mailto:[log in to unmask]]
Sent: Friday, February 08, 2002 7:45 AM
To: [log in to unmask]
Subject: Re: [HP3000-L] Sectors to Mbytes
Yup, U B right!
Because, the address space on PA-RISC machines is divided into units of 2048
bytes. HP-UX allocates main memory and file space in 2048-byte physical
pages, but MPE/iX manages file systems space in logical pages which are 4096
bytes, which are twice as large, for its own performance reasons.
Oops. See? HP-UX is infecting me! Sorry. S
See my revised diatribe below...
(The rest of us will hum along quietly...)
Four bits = one nibble.
Two nibbles = one byte.
Eight bits = one byte.
The HP 3000/MPE uses 8-bit ASCII.
Two bytes = logical word on "Classic" HP 3000s.
Two bytes = "halfword" on PA-RISC HP 3000's.
Four bytes = logical word on PA-RISC HP 3000's.
4096 bytes = one logical "page" on PA-RISC HP 3000's (HP-UX = 2048 bytes per
page).
One Kilobyte = 1024 bytes on all computers.
One Megabyte = 1,048,576 bytes on all computers, and...
MPE sectors are 256 bytes wide, so...
One Megabyte = 4096 MPE Sectors (about four-thousand sectors).
One Gigabyte = 1,073,741,824 bytes on all computers, so...
One Gigabyte = 4,194,304 MPE Sectors (about four-million sectors).
One Terabyte = 1024 Gigabytes on all computers, so...
One Terabyte = 1,099,511,627,776 bytes, so...
One Terabyte = 4,294,967,296 MPE Sectors (about four-billion sectors).
Chris
-----Original Message-----
From: Craig M. Lalley [mailto:[log in to unmask]]
Sent: Friday, February 08, 2002 8:44 AM
To: [log in to unmask]; [log in to unmask]
Subject: RE: [HP3000-L] Sectors to Mbytes
Chrisg said;
"2048 bytes = one logical "page" on PA-RISC HP 3000's."
Actually, I believe it is 2048 words = 4096 bytes = one logical "page"
on PA-RISC HP3000's.
IMHO
Craig M. Lalley
Systems Performance Specialist
Lund Performance Solutions
Phone (541) 812-7600 | Email [log in to unmask]
Fax (425) 920-4995| Web www.lund.com
NOTICE: This communication may contain privileged or other confidential
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-----Original Message-----
From: HP-3000 Systems Discussion [mailto:[log in to unmask]] On
Behalf Of [log in to unmask]
Sent: Friday, February 08, 2002 9:26 AM
To: [log in to unmask]
Subject: Re: [HP3000-L] Sectors to Mbytes
HP 3000 SIZING: just for fun ...
Four bits = one nibble.
Two nibbles = one byte.
Eight bits = one byte.
The HP 3000/MPE uses 8-bit ASCII.
Two bytes = logical word on "Classic" HP 3000s.
Two bytes = "halfword" on PA-RISC HP 3000's.
Four bytes = logical word on PA-RISC HP 3000's.
4096 bytes = one logical "page" on PA-RISC HP 3000's (HP-UX = 2048 bytes per
page).
One Kilobyte = 1024 bytes on all computers.
One Megabyte = 1,048,576 bytes on all computers, and...
MPE sectors are 256 bytes wide, so...
One Megabyte = 4096 MPE Sectors (about four-thousand sectors).
One Gigabyte = 1,073,741,824 bytes on all computers, so...
One Gigabyte = 4,194,304 MPE Sectors (about four-million sectors).
One Terabyte = 1024 Gigabytes on all computers, so...
One Terabyte = 1,099,511,627,776 bytes, so...
One Terabyte = 4,294,967,296 MPE Sectors (about four-billion sectors).
Have a great weekend..
Chris
----------
Paul,
A sector is 256 bytes, so 4 sectors equal one Kilobyte or (256 *
4
* 1024)
= 1 Meg.
Thanx,
Jon
-----Original Message-----
From: HP-3000 Systems Discussion [mailto:[log in to unmask]]On
Behalf Of Paul Thompson
Sent: Friday, February 08, 2002 8:47 AM
To: [log in to unmask]
Subject: [HP3000-L] Sectors to Mbytes
I've had a brain lapse...can someone remind me of the calculation of
converting disc sectors to megabytes...
TIA
Paul
Paul Thompson
HP3000/Ecometry Analyst
Spark Response
Tel: 0191 4959999 ext:5416
Email: <mailto:[log in to unmask]>
Website: <http://www.sparkresponse.com/>
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