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Holger is spot on here, there are MANY issues to consider.
Memory amount is easy to see of course but too little is too little.
CPU config can be a biggie. If your partition is set as 0.05 and capped
you will be throttled significantly. Even if you are set to 0.05 and
UNcapped, if you need more like 0.5 normally then you will be wasting a
lot of time queuing rather than executing.
Disk performance however IS #1. As has been mentioned the Hosting
partition (VIOS or IBM i) the disks being hosted (Internal disk) or
external SAN is Key.
You are looking for the basic disk subsystem performance. (10K vs 15K vs
SSD vs Flash) the configuration of that (Too few arms, etc). Looking at
competition between servers on the storage. If you have mixed IBM i and
other O/Ss on the same storage this is potentially bad and to be avoided.
Then the connectivity could be done wrong. Today SANs are attached with
Fiber and while some say you need those 16Gb paths but the truth is if
you look at usage for the fiber paths you almost never see any
significant usage there even on 8G paths as there should be a minimum of
four of these between your Power System and your storage and often there
are more. Done wrong this could be a problem but needs to be reviewed.
We can't eliminate the network as a problem because anything CAN be done
wrong, however normally we use very little bandwidth so the available
network performance usually is not an issue.
Larry "DrFranken" Bolhuis
--
www.Frankeni.com
www.iDevCloud.com - Personal Development IBM i timeshare service.
www.iInTheCloud.com - Commercial IBM i Cloud Hosting.
On 2/11/2019 10:50 AM, Holger Scherer wrote:
Hi Bob,
as a hoster which also provides shared machines, we know these questions. Depending on the hoster you are working with,
there is a lot of parameters to check out
- CPU should be faster - yes (you might have 0.1CPU of a Power8
- Network usually is no issue
- what about disk performance? Depending on the disk setup they use, other LPARs might draw too much disk performance
Run a WRKDSKSTS whilst running some programs and check out the last column
which will tell about latency and waits. I assume this might be some issue.
When you did your FTP, can you remember if it was fast or not?
-h
Am 11.02.2019 um 16:41 schrieb Bob Cagle <bcagle@xxxxxxxxxxx>:
Any suggestions of what to look at? It just seems to me that this new machine should be at least somewhat noticeably quicker - but it's not.
midrange.com
