The DD has a limit on the number of tape drives that can be configured and used. The quote below is from the DD Admin Guide (v4.9):
" Drives?From 1 to 256 tape drives are supported, depending on the Data Domain model. The DD4xx, DD510 and DD530 systems can have a maximum of 64 drives. All other models can have a maximum of 128 drives, except the DD880, which can have up to 256 drives. Note: Although one can configure up to 256 tape devices on a DD880 there is a maximum stream limit of 180 streams. Therefore, the maximum number of concurrent backups is 180. Additional drives beyond 180 can be configured for provisioning as per backup policies. " Also, while I'm not finding the info, there is a similar limit on NFS data streams. And, this limit includes all data streams, including remote replication streams. Rick From: Daniel Sparrman <daniel.sparr...@exist.se> To: ADSM-L@VM.MARIST.EDU Date: 09/27/2011 12:11 PM Subject: Ang: Re: [ADSM-L] vtl versus file systems for pirmary pool Sent by: "ADSM: Dist Stor Manager" <ADSM-L@VM.MARIST.EDU> Not really sure where the general idea that a VTL will limit the number of available mount points. I'm not familiar with Data Domain, but generally speaking, the number of virtual tape drives configured within a VTL is usually thousands. Not sure why you'd want that many though, I always prefer having a small diskpool infront of whatever sequential pool I have, and let the bigger files pass the diskpoool and go straightly to the seq. pool. As far as for LAN-free, the only available option I know of is SANergy. And going down that road (concerning both price & complexity) will probably make the VTL look cheap. Not sure what kind of licensing you're talking about concerning VTL, but I assume it's a Data Domain license and not a TSM license? Best Regards Daniel Sparrman Daniel Sparrman Exist i Stockholm AB Växel: 08-754 98 00 Fax: 08-754 97 30 daniel.sparr...@exist.se http://www.existgruppen.se Posthusgatan 1 761 30 NORRTÄLJE -----"ADSM: Dist Stor Manager" <ADSM-L@VM.MARIST.EDU> skrev: ----- Till: ADSM-L@VM.MARIST.EDU Från: Rick Adamson <rickadam...@winn-dixie.com> Sänt av: "ADSM: Dist Stor Manager" <ADSM-L@VM.MARIST.EDU> Datum: 09/27/2011 16:52 Ärende: Re: [ADSM-L] vtl versus file systems for pirmary pool A couple of things that I did not see mentioned here which I experienced was.... for Data Domain the VTL is an additional license and it does limit the available mount points (or emulated drives), where a TSM file based pool does not. Like Wanda stated earlier depends what you can afford ! I myself have grown fond of using the file based approach, easy to manage, easy to configure, and never worry about an available tape drive (virtual or otherwise). The lan-free issue is something to consider but from what I have heard lately is that it can still be accomplished using the file based storage. If anyone has any info on it I would appreciate it. ~Rick Jax, Fl. -----Original Message----- From: ADSM: Dist Stor Manager [mailto:ADSM-L@VM.MARIST.EDU] On Behalf Of Tim Brown Sent: Monday, September 26, 2011 4:05 PM To: ADSM-L@VM.MARIST.EDU Subject: [ADSM-L] vtl versus file systems for pirmary pool What advantage does VTL emulation on a disk primary storage pool have as compared to disk storage pool that is non vtl ? It appears to me that a non vtl system would not require the daily reclamation process and also allow for more client backups to occur simultaneously. Thanks, Tim Brown Systems Specialist - Project Leader Central Hudson Gas & Electric 284 South Ave Poughkeepsie, NY 12601 Email: tbr...@cenhud.com <<mailto:tbr...@cenhud.com>> Phone: 845-486-5643 Fax: 845-486-5921 Cell: 845-235-4255 This message contains confidential information and is only for the intended recipient. If the reader of this message is not the intended recipient, or an employee or agent responsible for delivering this message to the intended recipient, please notify the sender immediately by replying to this note and deleting all copies and attachments. ----------------------------------------- The information contained in this message is intended only for the personal and confidential use of the recipient(s) named above. If the reader of this message is not the intended recipient or an agent responsible for delivering it to the intended recipient, you are hereby notified that you have received this document in error and that any review, dissemination, distribution, or copying of this message is strictly prohibited. If you have received this communication in error, please notify us immediately, and delete the original message.