On Monday, 08/17/2015 at 10:33 EDT, Grzegorz Powiedziuk <gpowiedz...@gmail.com> wrote: > If that?s is the case ?.. why power7 and power8 officially can have up to 64 > nodes per channel!? (That?s what I was told by AIX admins)
The number is now 64 on the z13 with the FICON Express16s cards. The following will be appearing in an upcoming edition of the IOCP book: Limit per FCP FICON FICON channel path (PCHID) Express8s Express16s -------------------------- --------- ---------- Defined subchannels 420 420 Active NPIV subchannels 32 64 Connected remote N_Ports 512 1024 Concurrent I/Os 960 1528 Open LUNs (per feature) 4096 8192 > Can I have more (many more) wwpns and devices per FCP channel but use only up > to 32 and I will be fine. The limit of 32 is on the number of active NPIV subchannels, not the number of active connections being used by a given NPIV subchannel. From an LGR perspective, you will want to set a unique EQID for a matched set of FCP pchids on system A and B. This will ensure that LGR won't overload any one FCP path. The 32/64 limit is a soft limit, an IBM recommendation. That is, it's up to you how far you want to push the envelope with respect to error recovery. Alan Altmark Senior Managing z/VM and Linux Consultant Lab Services System z Delivery Practice IBM Systems & Technology Group ibm.com/systems/services/labservices office: 607.429.3323 mobile; 607.321.7556 alan_altm...@us.ibm.com IBM Endicott ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For more information on Linux on System z, visit http://wiki.linuxvm.org/
