DAOS – Quali benefici ?

Vi riporto una serie di benefici che si possono avere implementando su Lotus Domino Server una gestione di allegati tramite DAOS :

* Disk space reduction. The most obvious benefit DAOS provides is freeing up disk space and storing smaller NSF files: A Domino database using DAOS no longer stores attachments, regardless of whether the attachments are duplicates or single instances. The amount of disk space saved depends on how large an attachment object is and how many times it’s referenced. Also, it’s not just a single NSF that benefits; on a DAOS-enabled server, all DAOS-enabled NSFs share like attachments.
* I/O reduction. By storing the attachment outside the NSF, operations that do not directly access the attachment no longer have to move around large blocks of data.
* Faster compacts. The compact task has only small references to attachment files (known as “tickets”) to move around, instead of large attachment objects.
* Reduced backup size and throughput. Once an attachment is stored in the DAOS repository, the attachment does not change, regardless of the number of references to it. Therefore, incremental backup does not need to send this data again, and the backup space requirements do not increase as referencers (documents referencing the attachment) increase.
* More efficient mail attachment delivery. Notes mail handling also benefits from leveraging DAOS. For example, during message delivery, the mail database recognizes when the same attachment is being sent to multiple recipients and uses DAOS to calculate the small ticket to reference the item. The router then duplicates the ticket to each participating mail file on the server. By eliminating the need to write the whole attachment file multiple times, DAOS saves bandwidth and CPU cycles, which translates into a lower total cost of ownership (TCO).
* Transparency to Domino APIs. DAOS is agnostic about the objects it manages, meaning that it doesn’t care about the origin of the attachment; it works at the level of the disk write operation, so the fact that the attachment is stored outside the NSF is transparent to the application program interface (API), agents, LotusScript, and extension handlers.

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