Derrick:
*myself* I would never put multiple page DS's from multiple systems
on the same drive.
The rule I have observed for 40+ years. Nor would I place multiple
page ds's on the same drive from one system.
Dedicate a drive for each page ds.
Ed
On Dec 3, 2014, at 3:00 PM, Derrick Haugan wrote:
We built our current paging configuration years ago, when the max #
slots per page dataset was 1M. At the time we wanted to use
mod-27's, and so we staggered multiple page datasets per volume,
from different systems (happen to be in the same sysplex) so as not
to waste space on the volume (we did not place any other type of
datasets on the paging volumes).
We have always used PAV's (now HyperPavs) for paging for
performance reasons, and have never had performance problems with
this configuration (but we dont do alot of paging).
We are preparing to use flash express on our EC12 based systems,
and are considering reconfiguring page datasets on either mod-27's
or mod-54's using 1 local page dataset per volume, as when using
the flash/SCM for paging, only VIO pages will go to DASD for paging
under normal circumstances. This would simplify paging volume
configuration. Currently on our mod27s there are 12 paging slots
per track (run an IDCAMS/LISTCAT of the page dataset). So a mod27
with 30051 cyls/450,765 trk would hold 5,409,180 slots or roughly
20.6GB.
example of what we have been using: (mod27, 5-member sysplex , one
local page dataset from each system on the volume)
CCCCC-HH -------- D A T A S E T N A M E ----------- Org Trks
00000 00 VTOC POINTER
VP 1
00000 01 SYS1.VTOCIX.PAG300 PS 14
00001 00 VTOC
VT 75
00006 00 SYS1.PAGE27.A090.PLPA.DATA VS 5100
00346 00 SYS1.VVDS.VPAG300 VS 10
00346 10 * * * F R E E S P A C E * * * FS 5
00347 00 SYS1.PAGE27.A090.LOCAL1.DATA VS 87375
06172 00 SYS1.PAGE27.N090.COMMON.DATA VS 8550
06742 00 SYS1.PAGE27.N090.LOCAL8.DATA VS 87375
12567 00 SYS1.PAGE27.G090.LOCAL1.DATA VS 87375
18392 00 SYS1.PAGE27.J090.LOCAL8.DATA VS 87375
24217 00 SYS1.PAGE27.Y090.LOCAL1.DATA VS 87375
30042 00 * * * F R E E S P A C E * * * FS 135
30051 00 END OF VOLUME EV 0
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