rsync read block size

[Ming Zhang]

>
> No. The block size is NEVER relevant for a copy via rsync, bits are bits
> regardless of you copying them bit by bit or in larger groups.
>

please have a read
http://www.oracle.com/technology/documentation/berkeley-db/db/ref/transapp/archival.html
see the db page size issue when copy a online db.


> The man-page of db_hotbackup meantions (indirectly) that the backup is
> without cooperation from the application and the database content may be
> inconsistent. Not from the technical standpoint of BDB, but from the
> high-level application standpoint. The application has to use
> transactions correctly so that the database-content is consistent at any
> point in time.
>
> In short: If your application does correcy transactions, hotbackup
> appears to be a useable variant of the "snapshot"-db-backup type.
>

please not only read the man page of db_hotbackup, but also read the
source code and the related BDB reference guide. then u will know that
db_hotbackup do some db related work and then begin to copy file use
posix read/write. and it read at multiple DB size.