Date: Wed, 20 Apr 2005 09:10:02 -0500 From: Dan Nelson <dnelson@allantgroup.com> To: Konrad Heuer <kheuer2@gwdg.de> Cc: freebsd-questions@freebsd.org Subject: Re: DLT tape / no streaming Message-ID: <20050420141002.GC29613@dan.emsphone.com> In-Reply-To: <20050420090231.R37022@gwdu60.gwdg.de> References: <20050420090231.R37022@gwdu60.gwdg.de>
next in thread | previous in thread | raw e-mail | index | archive | help
In the last episode (Apr 20), Konrad Heuer said:
> I use a Benchmark DLT tape drive to backup data on my DELL PowerEdge
> 2650 system; syslog says:
>
> Apr 20 09:09:02 gwdu111 /kernel: sa0 at ahc0 bus 0 target 6 lun 0
> Apr 20 09:09:02 gwdu111 /kernel: sa0: <BNCHMARK VS640 5032> Removable Sequential Access SCSI-2 device
> Apr 20 09:09:02 gwdu111 /kernel: sa0: 20.000MB/s transfers (10.000MHz, offset 15, 16bit)
>
> The problem I see is that data flow is not steadily streaming; the
> tape drive is operating in start-stop-mode.
What blocksize are you using? If you're just using tar, the default of
10k is too small. Try 64k ("tar cvb 128 /usr", for example).
--
Dan Nelson
dnelson@allantgroup.com
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20050420141002.GC29613>