[Drbd-dev] Compression in DRBD

[Drbd-dev] Compression in DRBD

[komal]

Hi all,
          Bandwidth is an important issue in DRBD during replication of
data. If bandwidth is properly utilized then replication will be faster
and speed is what everyone needs.
        When bandwidth utilization comes into picture, compressing data
is what
is needed. Earlier discussions were going on to use vtun with a tcp
tunnel with zlib compression factor 9 or so to achieve compression.
        What about implementing compression in DRBD itself. Like using
zlib to
compress each packet and decompress it on receiver side in DRBD code
itself rather than using vtun and all. Wont it solve the purpose? 

Thanks and Regards,
Komal Nawandar.

Re: [Drbd-dev] Compression in DRBD

[Philipp Reisner]

Am Mittwoch, 7. März 2007 11:16 schrieb komal:
> Hi all,
>           Bandwidth is an important issue in DRBD during replication of
> data. If bandwidth is properly utilized then replication will be faster
> and speed is what everyone needs.
>         When bandwidth utilization comes into picture, compressing data
> is what
> is needed. Earlier discussions were going on to use vtun with a tcp
> tunnel with zlib compression factor 9 or so to achieve compression.
>         What about implementing compression in DRBD itself. Like using
> zlib to
> compress each packet and decompress it on receiver side in DRBD code
> itself rather than using vtun and all. Wont it solve the purpose?
>

Hi,

DRBD is a really complex piece of software, and I really do not want to
duplicate anything that can get achieved on other levels.

Compression on the network can for sure be achieved by other means 
(outside of DRBD).

-phil
-- 
: Dipl-Ing Philipp Reisner                      Tel +43-1-8178292-50 :
: LINBIT Information Technologies GmbH          Fax +43-1-8178292-82 :
: Vivenotgasse 48, 1120 Vienna, Austria        http://www.linbit.com :

Re: [Drbd-dev] Compression in DRBD

[komal]

On Wed, 2007-03-07 at 12:55 +0100, Philipp Reisner wrote:
> Am Mittwoch, 7. März 2007 11:16 schrieb komal:
> > Hi all,
> >           Bandwidth is an important issue in DRBD during replication of
> > data. If bandwidth is properly utilized then replication will be faster
> > and speed is what everyone needs.
> >         When bandwidth utilization comes into picture, compressing data
> > is what
> > is needed. Earlier discussions were going on to use vtun with a tcp
> > tunnel with zlib compression factor 9 or so to achieve compression.
> >         What about implementing compression in DRBD itself. Like using
> > zlib to
> > compress each packet and decompress it on receiver side in DRBD code
> > itself rather than using vtun and all. Wont it solve the purpose?
> >
> 
> Hi,
> 
> DRBD is a really complex piece of software, and I really do not want to
> duplicate anything that can get achieved on other levels.
> 
> Compression on the network can for sure be achieved by other means 
> (outside of DRBD).
> 
> -phil

Hi,

	But if we implement compression in DRBD itself we can have selective
compression. 
	By selective compression I mean is that we will compress only data
packets and not configuration packets (which reports status and
configuration) which cannot be achieved with other compression
techniques. 
	
Thanks and Regards,
Komal