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  3. May 2013

Re: Housekeeping

Well, not quite.....

VIOS simply uses a 9th sector for every 8 sectors of 512 byte sector size to emulate the 520 byte sector. IBM i is still using 520 byte sectors, it's just that VIOS can emulate it with 512 byte sector formatted drives.

On my 720 the VIOS supported IBM i instances do have slower disk performance than the ones that use native disk. (not by much and you really have to dig to find it, but it's there)

Jim Oberholtzer
Chief Technical Architect
Agile Technology Architects


On 5/21/2013 6:37 PM, Mark S Waterbury wrote:
Hi, Matt:

How many years ago was "... before ..."? As of V6R1 and above, IBM i
uses industry-standard 512 blocksize disks as served up by VIOS.

See:
http://www-03.ibm.com/systems/resources/pcrm.pdf

This document contains a description (on page 102) of the use of
512-byte sectors vs. 520 byte sectors in i5/OS V6R1 and above when using
VIOS provided virtual disk.

Mark

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