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Hello,
I observe more and more performance issues with our application and they
started to show up after we've introduced a lot of SQL to our system. We've
did a lot of optimization but even after that we still have some problems
and I'm trying to understand what tools I can use to see if hard drives are
out bottleneck or maybe it is CPU.
System setup (from program/database perspective) is quite complicated.
We've moved from DDS to SQL tables(most tables) and MQT (materialized query
tables, biggest tables ) but programs were not changed and most of them
still use native I/O (but we have SQL behind because of RPG Open Access and
MQT/Indexes). I understand that we may have some overhead because of
this(on CPU) but for example MQT Updates/Insert are quite slow but we use
the for Read operation because chain operation with sql behind was very
slow without MQT. Of course we use SQL triggers in this setup.
We do not have EasyTier license and from what I've read it could tell us
if we could benefit from SSD. I've also found something about SSD Analyzer (
http://www-01.ibm.com/support/docview.wss?uid=tss1prs3780) but only for
7.1 and it look like it does not work on 7.3 (I could not see it as
collection in iNavigator
We have machine type 8286-41A (power8) with 3 LPARS which has few HDD
drives (raid 5) and StorWize 5010 with few HDD Drives. Unfortunately we do
not have VIOS and LPAR 1 (master) expose HDD to DEV LPAR and PROD LPAR.
This of course should and will be changed but to be honest I have no idea
how much performance we may get if we start use VIOS.
Now I'm totally lost which tools/commands could tell me if response time
from our HDD is weak point and this is why we have slow read/write times
and our CPU does nothing because it waits for HDD(and we should buy few SSD
for hot files). We have Performance Tool so I can use collections
services/performance monitor and then print one of available reports but
there are so many of them. I guess disk report can be used.
Do You have any advices what should I check here?
Filip
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Hello,
I observe more and more performance issues with our application and they
started to show up after we've introduced a lot of SQL to our system. We've
did a lot of optimization but even after that we still have some problems
and I'm trying to understand what tools I can use to see if hard drives are
out bottleneck or maybe it is CPU.
System setup (from program/database perspective) is quite complicated.
We've moved from DDS to SQL tables(most tables) and MQT (materialized query
tables, biggest tables ) but programs were not changed and most of them
still use native I/O (but we have SQL behind because of RPG Open Access and
MQT/Indexes). I understand that we may have some overhead because of
this(on CPU) but for example MQT Updates/Insert are quite slow but we use
the for Read operation because chain operation with sql behind was very
slow without MQT. Of course we use SQL triggers in this setup.
We do not have EasyTier license and from what I've read it could tell us
if we could benefit from SSD. I've also found something about SSD Analyzer (
http://www-01.ibm.com/support/docview.wss?uid=tss1prs3780) but only for
7.1 and it look like it does not work on 7.3 (I could not see it as
collection in iNavigator
We have machine type 8286-41A (power8) with 3 LPARS which has few HDD
drives (raid 5) and StorWize 5010 with few HDD Drives. Unfortunately we do
not have VIOS and LPAR 1 (master) expose HDD to DEV LPAR and PROD LPAR.
This of course should and will be changed but to be honest I have no idea
how much performance we may get if we start use VIOS.
Now I'm totally lost which tools/commands could tell me if response time
from our HDD is weak point and this is why we have slow read/write times
and our CPU does nothing because it waits for HDD(and we should buy few SSD
for hot files). We have Performance Tool so I can use collections
services/performance monitor and then print one of available reports but
there are so many of them. I guess disk report can be used.
Do You have any advices what should I check here?
Filip
--
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at https://archive.midrange.com/midrange-l.
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