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Tape block size windows io size

Created: 17 Aug 2014 | 2 comments

I have noticed that changing the block size on the tape does not change the windows io size as seen by the perfmon counter average disk bytes/read when files are being read for backup on a 2008 R2 server.  I see the same 64k bytes/read when the tape block size is set to any value ie 64k 128k 256k  Is this expected behaviour or should the block size being read match the size being written or does backupexec have a fixed application io size when reading files for backup??

Operating Systems:

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CraigV's picture

...I suspect you see this because it kind of bypasses Windows. It should be interpreted by Backup Exec only where the block size is set.

Thanks!

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iammejutty's picture

????  Not sure I understand what you mean, when looking at the stats on perfon and the san my server that is beingbackup up is requesting data in 64k chunks and not the block size that I have specified on the tape device.  I would have thought that these should match, might just open a tech support case for some clarity.