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[LDM #HRQ-388363]: Replacing LDM with rsync
- Subject: [LDM #HRQ-388363]: Replacing LDM with rsync
- Date: Thu, 09 Jun 2011 11:26:19 -0600
Leonard,
> Our usage of LDM appears to be very simple in configuration. pqact only logs
> the filename. scour doesn't do anything. I then think that the benefits of
> LDM would be implicit it its default operation.
>
> Is there anything implicit in LDM which makes it more reliable than
> repeatedly running rsync?
Not really. The LDM is designed so that data older than a configurable amount
of time is unimportant and won't be transferred. rsync(1), on the other hand,
will try to transfer a file regardless of how old it is or how long the network
has been down.
> I think another advantage of LDM is the architecture of point to multipoint
> distribution, to send a stream of data to multiple recipients. We have only
> one point to one other point, Hawaii to here.
>
> Is there anything else I should consider in this comparison?
Let me try to break this down.
Things that favor the LDM:
Distribution to multiple sites
High volume
Rapid delivery (i.e., low latency) is important
Selection of subsets of data streams
New data generated routinely
Data older than, say, one hour is unimportant
A receiving site might become a relay site
Things that favor rsync(1):
Distribution to a single site
Low volume
Everything in a directory tree must be transferred
No data file can be ignored -- regardless of how old
I hope this helps.
> Thanks.
>
> ==Leonard E. Sitongia
> High Altitude Observatory
> National Center for Atmospheric Research
> P.O. Box 3000 Boulder CO 80307 USA
> address@hidden voice: (303)497-2454 fax: (303)497-1589
Regards,
Steve Emmerson
Ticket Details
===================
Ticket ID: HRQ-388363
Department: Support LDM
Priority: Normal
Status: Closed