On 02/18/99 09:29:26 you wrote:

Hi All,

Any other CIFS users seeing very poor CIFS performance when accessing large numbers of small files?

The specific problem is with across network backups using ARCServe. We were seeing 70MB/min to a DLT3 drive when running OnTap 5.1D3, but upgrding to 5.2.1 has dropped that back to 20MB/min.

When I backup large files (256MB core files for example) I'm seeing backup throughput of ~130MB/min which is pushing the DLT drive close to its limit (150MB/min with 2:1 compression).

In general the performance for large files is better in 5.2.1, but Netapp seem to have broken the small file throughput.

By large numbers of small files, do you mean a bunch of small files in one directory? If so, are you sure this collection of small files actually existed when you did the backup before on the previous OS version?

I guess what I'm getting at is the possible explanation that nothing broke between 5.1D3 and 5.2.1. Obviously, if something did, you'll have to wait to hear back from Netapp.

It's also possible there was a fix in your D3 patch that did not make it into 5.2.1. People running patched versions to address a particular problem should always check to see if the patch made it into a subsequent release.

Bruce