Network slows down then regains speed

Soldato
Joined
31 May 2009
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At work we have one fileserver which connects around 15 workstations.
Its main function is to run a server versions of a booking/notes/xrays system.
We have noticed especially more so recently, that the system grinds to virtual standstill several times per day before resuming normal function. It is most fustrating, and I am unable to figure out what leads to the slowdowns.

The server itself is a HP tower, which is populated by a single processor, the drives are in 2 separate banks of raid, one handles all the main data, records, bookings papernotes equivalents, and the other bank is dedicated to digital images. Each is backed up separately, each night, and this process completely without problem and well beofre anyone arrivesback the next day.


What are the likely bottlenecks in such a system, and how am i likely to relief them? There is a hardware company involved, they are muppets. There is also software support who have investigated and seem to think it isn't anything to do with them. When the system is grinding to a halt, i have view the server in task manager and nothing appears to be stealing major CPU cycles.
 
What software should I use to gauge and record the performance?
I won't be at the Server much, more likely at a workstation, and viewing the server before work, at lunchtime and after work.
 
It sounds like you're using Windows, so just setup Performance Monitor and leave it running for a couple of days. Ask some of the users to note down times when they experience slowdowns.

Some good counters to start with would be CPU, available memory, disk queue and TCP retransmissions.


When the system slows down the DISK QUEUE figures go off the chart.
CPU is up a bit but not loads, and RAM seems fine at this point also.
How would I investigate what is triggering the DISK QUEUE hammering?
 
Neither array is generating errors from what i can see.

I believe the smaller of the arrays which also happens to be the primary OS one seems to be where the queues are occurring but I am unsure how to investigate exactly what processes are causing the queue, how would i go about determining this?

The Scale is marked as 100.000 and it is going full on the bar, there are 2 drives, a basic mirror with 2*160Gb hard drives, of which there are about 30Gb free space.
The second RAID has 2*750Gb discs and severla hundred GBs free.

The server is a HP Proliant ML350 with a Xeon [email protected] and 3GB RAM, ATI ES1000.
networking provided by a HP ML373 multifunction gigabit server adapter going to router/switch/thingy
RAIDs are
LSI adapter Ultra 320 SCSI 2000(W/1020/1030)(StorPort) and
Smart Array E200I controller


Hope this proves useful information.
 
Aye OS is 2003 SBS afaik.

I need time to actually look at the server stuff, unfortunately my job gives me virtually zero free time during the 9-1 and 2-5 periods and I am not going to be remunerated for anything I find.
I will try to determine teh cause as it would make my working time easier if i discover the issue.
 
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