Hello all,
We are a longtime zOS shop taking the plunge into the zVM / zLinux
(SUSE 10SP2) world. We had never implemented HiperSockets in our zOS
environment so our experience with this technology is rather limited.
HiperSockets were implemented specifically to support our desire to take
advantage of FDR/Upstreams ability to interface with our zOS tape
management tools.
During the last week or so we've been testing the different
FDR/Upstreams backup and restore processes (including the RMAN option).
The backup and restore processes work as advertised, but we are looking
for better throughput times for these processes.
Currently the HiperSocket channel is defined in the I/O Gen as having a
Maximum Frame Size of 16 KB, the MTU size on both the zOS and z/linux
interfaces is set to 8192 (see Below). The backups are going to our
VTS which is Ficon attached to the Mainframe.
DevName: IUTIQDF4 DevType: MPCIPA
DevStatus: Ready CfgRouter: Non ActRouter: Non
LnkName: HIPR2 LnkType: IPAQIDIO LnkStatus: Ready
NetNum: n/a QueSize: n/a
IpBroadcastCapability: No
ArpOffload: Yes ArpOffloadInfo: Yes
ActMtu: 8192
ReadStorage: GLOBAL (2048K)
SecClass: 255 MonSysplex: No
IQDMultiWrite: Disabled
BSD Routing Parameters:
MTU Size: 8192 Metric: 00
DestAddr: 0.0.0.0 SubnetMask: 255.255.255.0
Multicast Specific:
hsi0 Link encap:Ethernet HWaddr 00:00:00:00:00:00
inet addr:192.0.1.5 Bcast:192.0.1.255 Mask:255.255.255.0
inet6 addr: fe80::200:ff:fe00:0/64 Scope:Link
UP BROADCAST RUNNING NOARP MULTICAST MTU:8192 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:3 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 b) TX bytes:168 (168.0 b)
With the above settings I'm seeing throughput in the area of 15-18 Mb
per second.
I've spent the past few days scouring these archives looking for what
others have done. I found a few threads that addressed HiperSocket
throughput speeds between zOS and zLinux, but were using FTP as the
benchmark utility. I have a window this weekend where I can put in a
I/O Gen change for the Maximum Frame Size on the HiperSocket channel
define (hopefully I'm on the right track here).
So, the question I'm posing is : If you are using HiperSockets to
support FDR/Upstream, in your experience where did you find the
performance throughput sweet spot?
Thanks in advance for any input you may relay.
David Rakoczy
Operating Systems Programmer
Thermo Fisher Scientific
"He who laughs last probably made a backup."
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