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how much free space

By michael.castoire ·
Wher can I find out how much free space a server volume should have before it starts
to loose performance? I have been told 10-20
percent, but can't find this written anywhere.

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how much free space

by cavedweller In reply to how much free space

There isn't any one answer to your question. You need to have enough free space for your expected needs.

On a unix system you need to be especially careful with the /var filesystem. Logs, print jobs, mail and all kinds of temporary files get written or passed through there. If it ever fills up, even momentarily, your system will need to be rebooted. Now that big disks are cheap I try to make /var 5-10 times the recommended size (around 150M) on my Solaris systems.

A windows system tends to shrink it's swap file as the disk approaches full and this causes problems.

The real problem with user file systems is that as they fill up it is harder for the disk manager to write large files contiguously. Reading and writing fragmented files takes longer than reading and writing contiguous ones and the system starts to slow down.

If you have a fairly constant storage need and keep fragmentation low you can probably run at 90% (based on my experience).

If you want a technical reference with a particular number check your operating system documentation's tuning and performance chapter. (You didn't mention which OS you use!)

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how much free space

by michael.castoire In reply to how much free space

the os is windows server 4.0 enterprise edition, and the data in question is static not dynamic.

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how much free space

by cavedweller In reply to how much free space

If all the data on your disk is static then you can fill it completely without loss of performance. The performance hit comes when the drive tries to squeeze files into the final, fragmented space and again when it has to seek all over the disk to read them back. Run a defragmentation tool on your disk after you fill it and then all the files will be contiguous and read quickly.

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how much free space

by michael.castoire In reply to how much free space

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how much free space

by michael.castoire In reply to how much free space

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