I find it easier to never have duplicate volume serial numbers. It requires a little work up front, but the required OS support was available in OS/390, so it's hardly leading edge.
-- Shmuel (Seymour J.) Metz http://mason.gmu.edu/~smetz3 עַם יִשְׂרָאֵל חַי נֵ֣צַח יִשְׂרָאֵ֔ל לֹ֥א יְשַׁקֵּ֖ר ________________________________________ From: IBM Mainframe Discussion List <[email protected]> on behalf of Radoslaw Skorupka <[email protected]> Sent: Wednesday, September 10, 2025 5:15 AM To: [email protected] <[email protected]> Subject: Re: Storage migration External Message: Use Caution Answers below W dniu 08.09.2025 o 11:27, Peter pisze: > Hello > > We are migrating our current storage from DS8886 to DS8910F. > > While both the storage are connected to mainframe can I point one of the > lpar to the new box DS8910F and ipl it ? Yes, that's easy. Simply provide new device addresses in the LOAD panel. > We have two zOS LPARS in mainframe and I want to try IPL one of the LPARs > pointing to DS8910F. > > Out of the 6 channels . The 4 channels are connected to DS8886 and 2 > channels are connected to DS8910F. > > Is it possible to make the 4 channels offline prior loading the loading the > LPAR and have them point to 2 channels which are connected to DS8910F ? Yes, it is possible, however it most cases not needed at all. Method: Activate the LPAR, but do *not* start (IPL) the system. Then use SE/HMC features to make the channels offline to that LPAR. Then IPL (Load) the system. It is not needed, because you have unique device number in the IODF. And the numbers (aka addresses) are used to point SYSRES volume and IODF volume. Depending on some factors you could have duplicate volsers. In that case during IPL you will get (a lot of) WTORs asking which address to choose offline. However properly prepared OS Config will prevent it by making some devices as offline. Or not defined. -- Radoslaw Skorupka Lodz, Poland ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
