HP ML570 Novell NetWare 6 performance tuning guidelines for ProLiant servers - Page 16

monitoring the memory subsystem in NetWare 6, tips and tricks, Random Access Memory

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Novell NetWare 6 performance tuning guidelines for ProLiant servers table 7. types of memory technology type extended data out (EDO) Synchronous Dynamic Random Access Memory (SDRAM) double data rate (DDR) description This memory technology was first introduced early in the year 1994 as an improvement over Fast Page Mode (FPM) memory technology. The clock rate was 40 MHz with a max bandwidth of 320 MB/s. This memory technology was first introduced in the early 1996 at 66 MHz. The 100 MHz version was introduced in the year1998 and in the year 1999, 133 MHz version was introduced. The unbuffered DIMMs though slightly faster than the register DIMMs has limitation in the number of DIMMs that can be interconnected on a bus due to electrical loading. The registered DIMMs on the other hand have lighter electrical load requirements and thus more DIMMs can be interconnected on a bus. Introduced in the year 2000 as DDR SDRAM (100 MHz / 133 MHz). In theory DDR is capable of transferring data on both the rising and falling edges of the clock. monitoring the memory subsystem in NetWare 6 tips and tricks In NetWare 6, use the NetWare Monitor and/or the all-inclusive NRM utility to check the status of the memory parameters. These utilities provide clues as to whether there is a memory bottleneck in your system. The following parameters apply to only the traditional file system. For NSS values, refer to the NSS section in this document. • long term cache hit - cumulative percentage of the system memory since last started. • LRU setting time - measures the length of time it takes for a cache buffer at the head of the list to make its way down to the tail, where it becomes the LRU buffer. • SWAP activities - monitors the rate at which data is being moved from memory to disk. Use the following tips to improve the disk subsystem performance: • Use the NRM or the NetWare monitor utility to regularly monitor total memory available and cache statistics. • Set the long term cache hit counter range to be within 90% to 100%. • Set the LRU setting time to greater or equal to15 minutes. • Use the Swap utility to monitor virtual memory performance. If the overall system memory is running low, swapping does occur more often. • Add more memory, if swapping or disk thrashing is taking place due to insufficient system memory. 16

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Novell NetWare 6 performance tuning guidelines for ProLiant servers
table 7. types of memory technology
type
description
extended data out (EDO)
This memory technology was first introduced early in
the year 1994 as an improvement over Fast Page
Mode (FPM) memory technology. The clock rate was
40 MHz with a max bandwidth of 320 MB/s.
Synchronous Dynamic
Random Access Memory
(SDRAM)
This memory technology was first introduced in the
early 1996 at 66 MHz. The 100 MHz version was
introduced in the year1998 and in the year 1999,
133 MHz version was introduced. The unbuffered
DIMMs though slightly faster than the register
DIMMs has limitation in the number of DIMMs that
can be interconnected on a bus due to electrical
loading. The registered DIMMs on the other hand
have lighter electrical load requirements and thus
more DIMMs can be interconnected on a bus.
double data rate (DDR)
Introduced in the year 2000 as DDR SDRAM (100
MHz / 133 MHz). In theory DDR is capable of
transferring data on both the rising and falling
edges of the clock.
monitoring the
memory subsystem in
NetWare 6
In NetWare 6, use the NetWare Monitor and/or the all-inclusive NRM utility to check the
status of the memory parameters. These utilities provide clues as to whether there is a
memory bottleneck in your system. The following parameters apply to only the traditional
file system. For NSS values, refer to the NSS section in this document.
•
long term cache hit – cumulative percentage of the system memory since last started.
•
LRU setting time – measures the length of time it takes for a cache buffer at the head
of the list to make its way down to the tail, where it becomes the LRU buffer.
•
SWAP activities – monitors the rate at which data is being moved from memory to
disk.
tips and tricks
Use the following tips to improve the disk subsystem performance:
•
Use the NRM or the NetWare monitor utility to regularly monitor total memory
available and cache statistics.
•
Set the long term cache hit counter range to be within 90% to 100%.
•
Set the LRU setting time to greater or equal to15 minutes.
•
Use the Swap utility to monitor virtual memory performance. If the overall system
memory is running low, swapping does occur more often.
•
Add more memory, if swapping or disk thrashing is taking place due to insufficient
system memory.
16