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Buffer Size Limitations

Views: 13435
Votes: 2
Posted: 20 May, 2009

All BRU products support a multitude of buffer sizes that the user is able to specify when writing to tape devices.  However, not all tape formats support all buffer sizes that BRU is capable of using.  Therefore, if you are using BRU to backup to a tape device, be aware of the following buffer size limitations.

Additionally, the below "Max Buffer" specifications may differ based on the operating system, HBA and other limitations. For example, USB tape drives on Linux cannot use block sizes larger than 64K due to a Linux kernel limitation for the USB transport layer.

If you have questions concerning the table below, please contact Technical Support before making changes to avoid any unwanted or adverse affects.

 

Device Max Buffer Notes
DAT 512K While you can use greater than 512k, there is no further performance gain.
VXA -1/2 128K This is a limitation of the drive technology.
VXA-320 256K The current firmware version errors on larger buffer sizes.
Non-SAS DLT Variants 2048K  
SAS DLT Variants 2048K
1024K
2048k is supported with the ATTO ExpressSAS HBAs.  If using the LSI SAS HBA, this is limited to 1024k.
LTO -1 1024K This is a limitation of the drive technology.
LTO-2 through 4 2048K Larger buffer sizes demonstrated no additional performance gains.
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