Re: [Dump-users] Dump 10 times slower on faster system

[Steve B. <fb7...@sn...>]

On Wed, Jan 11, 2012 at 11:04 AM, Bob Blanchard Jr.
blabj-at-dainty.ca|dump-users/gmail/sbonds|
<2n2...@sn...> wrote:
.... trimmed ...

> All interfaces are SAS, I can do dd reads from tape at 150 MB/s from both
> systems.
>
> Trying to determine if this is kernel related (st module) or dump related
> or ext3/4 related.
>

It looks like you're on the right track with your dd read tests to the tape
drive.  What about dd write tests to the tape drive and dd read tests from
the disk partition?  If these are slow, then dump will never get any faster.

I also recall some performance issues with older versions of dump-- try the
newest release (or even the CVS version) and see if the problem persists.
 You were using 0.4b41 (2006) and current is 0.4b44.

  -- Steve Bonds