Something additional on the topic: According to IBM 3583 Guide you can configure it for dual-path. It is not full dual-ported as 3590 drives but still gives some additional protection. The configuration in the guide is utilizing twin-tail SCSI: FC port from the SAN switch ---> SAN Data Gateway module in first (!) 3583 ---> LVD SCSI Ultrium drive (3583 does not have FC drives) in first 3583 ---> LVD SCSI Ultrium drive in second 3583 ---> SDG module in second library ---> port in another SAN switch While this is not full no-single-point-of-failure configuration it gives some additional protection against SAN switch, FC cable or SDG module failure. SCSI failures are not covered but would affect just part of the library. The new for me was that this is *supported* configuration. So I am sharing this with you. And because module in 3583 is functionally equivalent to stand-alone device (2108-G07) I think same should be possible for 3584 with SCSI drives and two SDGs. Somewhat strange SCSI drives to allow little bit higher availability compared to FC but is a fact - if the SAN switch a drive is attached to fails drive is not accessible. In pure FC environment to implement something like the SCSI conf we would need to over-complicate the fabric with hubs between two switches and drive(s). At the end this achieves only redundancy not load-balancing. Just some thoughts.
Zlatko Krastev IT Consultant Please respond to "ADSM: Dist Stor Manager" <[EMAIL PROTECTED]> Sent by: "ADSM: Dist Stor Manager" <[EMAIL PROTECTED]> To: [EMAIL PROTECTED] cc: Subject: Re: Atape driver 7.0.3.0 auto failover The 3590 is a dual ported device. It actually has two fiber port WWPNs. AIX actually is talking to both ports all the time but only sends out primary IO right now to whichever is the current primary. What is coming is load balancing based on what I know. This way the ES-1000s will have balanced IO if both ports are connected to 2 different pathways (ES-1000s). Finally, there is a reason 3590 is far superior. -----Original Message----- From: David Longo [mailto:[EMAIL PROTECTED]] Sent: Tuesday, February 26, 2002 4:40 PM To: [EMAIL PROTECTED] Subject: Re: Atape driver 7.0.3.0 auto failover They aren't dual ported. I have (8) 3580 LTO drives FC-AL attached. I have (2) McData ES-1000 switches with 4 drives on each switch. The library control path is currently through DRIVE 1. I am actually looking for failover of the Library (/dev/smc0), in case of failure of drive 1 or the McData switch it's on. I can configure a second control path (in fact I have done this on drive 5 and it comes up on AIX as /dev/smc1, but I am not using it). As I read the readme on Atape it seemed the auto failover was what would handle this, but it says only for 3590 devices. The library has hot swap drives, but if drive1 failed or needs to be replaced I have some amount of downtime that I wouldn't have with the other drives. David Longo >>> [EMAIL PROTECTED] 02/26/02 04:15PM >>> Are the 3584 drives dual ported? -----Original Message----- From: David Longo [mailto:[EMAIL PROTECTED]] Sent: Tuesday, February 26, 2002 2:09 PM To: [EMAIL PROTECTED] Subject: Atape driver 7.0.3.0 auto failover I notice that the Atape driver 7.0.3.0 supports Auto failover for tape devices on 3590 devices only, as I read it. Anybody know when it will be supported on 3584 library with Fibre Channel? Or is someone using it that way now? David Longo "MMS <health-first.org>" made the following annotations on 02/26/02 14:22:31 ---------------------------------------------------------------------------- -- This message is for the named person's use only. It may contain confidential, proprietary, or legally privileged information. No confidentiality or privilege is waived or lost by any mistransmission. If you receive this message in error, please immediately delete it and all copies of it from your system, destroy any hard copies of it, and notify the sender. You must not, directly or indirectly, use, disclose, distribute, print, or copy any part of this message if you are not the intended recipient. Health First reserves the right to monitor all e-mail communications through its networks. Any views or opinions expressed in this message are solely those of the individual sender, except (1) where the message states such views or opinions are on behalf of a particular entity; and (2) the sender is authorized by the entity to give such views or opinions. ============================================================================ == "MMS <health-first.org>" made the following annotations on 02/26/02 16:53:21 ---------------------------------------------------------------------------- -- This message is for the named person's use only. It may contain confidential, proprietary, or legally privileged information. No confidentiality or privilege is waived or lost by any mistransmission. If you receive this message in error, please immediately delete it and all copies of it from your system, destroy any hard copies of it, and notify the sender. You must not, directly or indirectly, use, disclose, distribute, print, or copy any part of this message if you are not the intended recipient. Health First reserves the right to monitor all e-mail communications through its networks. Any views or opinions expressed in this message are solely those of the individual sender, except (1) where the message states such views or opinions are on behalf of a particular entity; and (2) the sender is authorized by the entity to give such views or opinions. ============================================================================ ==
