On 20/08/12 16:29, lst_hoe02 AT kwsoft DOT de wrote:
> Hello List
>
> this has been discussed already some times on the list but as i have
> ssen no real conclusion i will ask for opinion again. The setup is
> Bacula 5.2.10 on Ubuntu 12.04 LTS (x64) with a LTO-4 drive connected
> through Adaptec 29320LPE, a 320MByte/sec PCI-Express controller. To
> prevent the LTO-4 tape from shining/whining around we use the Data
> spool feature on a SSD drive (Intel Postville Refresh 120GB) with
> "Maximum Spool Size = 20GB" and "Maximum File Size = 4GB". This works
> as expected beside the fact that the transfer spped max. out at
> ~84MBytes/sec with encrypted data (hard to further compress) and
> 86MBytes/sec without encryption when using Bacula. To test if the
> hardware is to blame i have done some simple dd to tape like this
>
> "dd if=/some/file of=/dev/nst0 bs=xxK"

Test the speed of writing to/from disk as well as your tape speeds.

SSDs have high IOPS/seek rates but they're not always as fast for 
sequential operations as you might expect.







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