Agree, "Slowest device performance" rates is not specific to STU groups. Also, I guess, there is no effect on STU selection (in STU group) if the selection criteria is "failover".
Can you please share the etrack info (that Scott Kendell provided to you)? I am curious what is about. /Girish ----- Original Message ---- From: "Donaldson, Mark" <mark.donald...@staples.com> To: Girish Jorapurkar <giris...@yahoo.com>; VERITAS-BU@MAILMAN.ENG.AUBURN.EDU Sent: Friday, April 24, 2009 5:08:08 PM Subject: RE: [Veritas-bu] Inline Tape Copy vs Storage Unit Groups (and otherITC wierdness) Our use for storage unit groups is for failover in the possiblity that a media server goes down. The only backups we have that go direct to a standard storage unit is the few servers reachable through our firewalls. The permissions are only setup for a single destination for backups. Since ITC must use drives on the same media server, regardless of group or standard stu, then this warning would apply to any use of ITC. It's not storage group specific. Any ITC backup has the possiblity of being reduced to "slowest device performance" rates. This warning is confusing and unnecessary in my opinion but I do thank you for your information. Thanks, also, to Scott Kendell, for the eTrack info. Does seem like a bug. I didn't try to fix it before because I thought it might be an artifact of the mixed server versions I had for a very long time. I'm all consistent now. -M -----Original Message----- From: veritas-bu-boun...@mailman.eng.auburn.edu [mailto:veritas-bu-boun...@mailman.eng.auburn.edu] On Behalf Of Girish Jorapurkar Sent: Friday, April 24, 2009 8:02 AM To: VERITAS-BU@MAILMAN.ENG.AUBURN.EDU Subject: Re: [Veritas-bu] Inline Tape Copy vs Storage Unit Groups (and otherITC wierdness) Storage unit group is, typically, used for load-balancing jobs across mutliple STUs - possibly residing/attached to different Media servers. Inline-tape-copy creates multiple copies at 'backup time' by writing each copy to a different media from STU(s) attached to same Media server. Essentially, it receives a tar stream from a client to the media server and, then, hands out a copy to each media on the server. There are couple of points to note: (a) it will use as many drives (if tape is used) as copies being created, (b) all copies get created in-sync; so the backup speed for all copies is determined by the slowest one in the set. So, when ITC is pointed to STU group, the load-balancing will take backseat since each copy needs a STU (in the group) from a common Media server. And, that may result into undesired performance implications. The warning just highlights that it is not a best practice to do so. Depending on what version of NetBackup you have and your business requirements, you may want to look into disk-staging/duplication (6.0), Storage Lifecycle Policy (6.5.x) to create multiple copies. /Girish ----- Original Message ---- From: "Donaldson, Mark" <mark.donald...@staples.com> To: VERITAS-BU@MAILMAN.ENG.AUBURN.EDU Sent: Thursday, April 23, 2009 1:18:36 PM Subject: [Veritas-bu] Inline Tape Copy vs Storage Unit Groups (and other ITC wierdness) If I create a policy that uses inline-tape-copy to make an offsite copy, I see two pieces of wierdness that I don't understand. The first is that if I select a storage unit group for my destination, the tape pool, tape owner, etc. grays out. It's not like my tape pools are tied to a specific server, they're all setup for *ANY* server so that shouldn't be an issue. A work-around seems to be to use a regular STU at first, set-up everything, then go back and change it to a STU-Group. When you do that, it warns, in a pop-up box, "Warning. Selecting storage unit groups for multiple copies can severely impact performance." Anybody know the why's and wherefores of these things? -M _______________________________________________ Veritas-bu maillist - Veritas-bu@mailman.eng.auburn.edu http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu _______________________________________________ Veritas-bu maillist - Veritas-bu@mailman.eng.auburn.edu http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu _______________________________________________ Veritas-bu maillist - Veritas-bu@mailman.eng.auburn.edu http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu