[DRBD-user] [OT] rsync issues [Was Re: Read performance?]

Lars Ellenberg lars.ellenberg at linbit.com
Sun Jun 3 17:18:30 CEST 2007

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.

On Wed, May 30, 2007 at 02:35:29PM -0500, David Masover wrote:
> On Wednesday 30 May 2007 12:29:50 you wrote:
> In any case, neither issue is crucial -- DRBD is working for us, so long as no 
> one needs to restore something while another backup is running. It just 
> strikes me as amazingly stupid that it doesn't appear to be multithreaded at 
> all, and it's not hard to imagine situations that this would be completely 
> unusable for.

I wonder, if you have no idea what you are talking about, technically...
why don't you just ask?

> For example, DRBD+OCFS2 on a pair of load-balancing, redundant webservers, 
> connected over relatively low bandwidth / high latency / the Internet -- now 
> try unpacking some large-ish new web package onto the shared partition. 
> Suddenly, every website running off of these would be DOWN until the transfer 
> was complete.
> That's a purely hypothetical situation, but really, how hard would it be to at 
> least have a reader thread and a writer thread? (Don't you already have that, 
> anyway? Maybe better locking or something?)

this is not meant to offend you, please do not misunderstand me.

it just _technically_ makes no sense at all.
and that may be due to some misunderstandings about vocabulary used,
and the technical implications those things have, and about what
jobs the different components of a system have.

you don't need to know the implementation details of distributed cluster
file systems and non-shared disks with shared disk semantics.
that is what developers are for.

but don't talk in this way about things you don't understand.
it could easily lead to you being ignored by people who do.

if you don't understand the technical details, don't suggest
implementations, or try to judge how hard something would be,
unless you want to be ridiculed.

talk about things you _do_ understand.

I suggest you write a wishlist about
how you want to use something,
features you'd like to have,
what you think would make sense from a point of view of a
user/operator/consultant/sales person.

talk about how nice/cool/advantageous it would be
when there was something like
your favorite hypothetical tool.

motivate the technical people to suggest the technical solutions
or workarounds to implement what you think would be nice to have.

maybe there is already something out there,
that would even do something better than you thought of.

if not, maybe some developer comes up with a nice prototype
of something completely new,
or of some new feature to supplement whats already there.

: Lars Ellenberg                                  Tel +43-1-8178292-0  :
: LINBIT Information Technologies GmbH            Fax +43-1-8178292-82 :
: Schoenbrunner Str. 244, A-1120 Vienna/Europe   http://www.linbit.com :

More information about the drbd-user mailing list