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Virtual Memory

By dcollins ·
We have a Windows NT Server 4.0 with Service Pack 4 and has 256MB memory, (2) 4.3GB SCSI Hard Drives Mirrored, A/Open 10/100 325 Network Adapter. The system keeps giving us the following message:
"System is running low on virtual memory"
I've adjusted the virtual memory setting and it's set at the proper value based on 256MB memory. What's up?

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Virtual Memory

by david In reply to Virtual Memory

Are you running SQL server or is the server a DNS server? If it is a DNS server, check out this article. Q182713. The other article I have does not have a number but it says if you are running SQL server to set the virtual memory at 1.5 times thephysical memory. Good Luck.
David

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Virtual Memory

by dcollins In reply to Virtual Memory
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Virtual Memory

by rstencel In reply to Virtual Memory

The 1st answerer has a good point. The recommend setting for cache is a baseline. It doesn't always take into account all the software you may be running on your system. If you are running a lot of apps or have a lot of clients accessing your server this may not be enough. The role you set for your server also affects the way memory is used and how much you need to set up. Basically the more applications and users you have running the more virtual memory you will need.

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Virtual Memory

by dcollins In reply to Virtual Memory
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by ustutz In reply to Virtual Memory

Categorically set virtual memory to twice RAM without thinking twice. Depending on workload and diskspace available, three times RAM may not be outlandish. Also, on the virtual memory configuration screen you have two parameters: Initial Size andMaximum Size. Set both to the same value (i.e., the "maximum size").

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Virtual Memory

by dcollins In reply to Virtual Memory
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Virtual Memory

by a.douwes In reply to Virtual Memory

You can determain the amount of physical memory needen by adding all the memory specifications of the applications you will run concurrently. Have you checked with the TaskManager to see which application is consuming so much memory?
Does NT do themirroring or do you have a RAID-controler doing the mirroring? If NT does the mirroring it could wel be the cause of low virtual memory. Have you checked out the fixes of SP 5 and SP6a conserning memory leeks?

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Virtual Memory

by dcollins In reply to Virtual Memory
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Virtual Memory

by jp.jacoby In reply to Virtual Memory

The allowed minimum is the Phys. size + the size of the registry. Means here: 256 + 16MB. (+/- 16MB you have to check how big it is the registry is).
Anyway, depending of the software you use Exchange, Sql, Proxy.... set the minimum at 300 MB and the maximum at 512 Mb for the virtual memory. Better more than less if you have enough disk space.

jpj

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by dcollins In reply to Virtual Memory
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