[RManthey]

Hello to this brilliant forum, please give a newbie in pseries a wink.

We are actually configuring a loaner machine (P6 - p570 and DS4700 SAN) and we want to virtualize the SAN storage via VIO server to several LPARS for running SAP applications.
We created a RAID_5 Logical Drive in Storage Manager with 15 disks and one spare drive (about 3,8 TB capacity). VIO should serve LVs with different sizes to these LPARS which we thought would be pretty performant.

The problem : I can see a new hdisk4 in VIO after 'cfgdev' but I can not access any content of the new disk to create logical volumes :
0516-304 - unable to find id hdisk4 in the Device Configuration Database

Removing the hdisk and 'cfgdev' again leads to same result.
I wonder if l should build up the SAN storage in an other way?

Thans for your tipps!
Rainer

[RManthey]

Problem solved! lsattr and mkvg was possible, thx

[ross.mather]

This will not be a very "performing" way of doing things. You'd be much better off creating the individual disks needed by the LPARS as LUNS on the DS4700 and then linking the LUNS through to LPARS directly.

This cuts out the performance hit caused by needing the Logical Volume Manager at the Virtual I/O server.

[RManthey]

Thanks, Ross! I also thought about doing so after reading previous thread about performance issues here.
Will do so before SAP scenarios will be built up...
Thanks a lot!
R.