Steve - Why do you think this?
"The failure I see of this system is that even though the db is paused, it is not in a "safe" state for backup." Once you broke the mirror would it not be safe to backup that array?? Kevin Gusler Applications Developer Mortgage Builder Software, Inc. Main: 800.850.8060 ext. 106 Fax: 248.304.0601 www.mortgagebuilder.com -----Original Message----- From: u2-users-boun...@listserver.u2ug.org [mailto:u2-users-boun...@listserver.u2ug.org] On Behalf Of Steve Romanow Sent: Tuesday, June 23, 2009 2:34 PM To: U2 Users List Subject: Re: [U2] FW: Valid Backup on Windows Universe Kevin Gusler wrote: > How many disks are in your array and are they all raid 0? > > What kind of controller (if hardware) are you using that is doing a Raid > 0+1+1?? > > > Kevin Gusler > Applications Developer > Mortgage Builder Software, Inc. > Main: 800.850.8060 ext. 106 > Fax: 248.304.0601 > www.mortgagebuilder.com > > > -----Original Message----- > From: u2-users-boun...@listserver.u2ug.org > [mailto:u2-users-boun...@listserver.u2ug.org] On Behalf Of Steve Romanow > Sent: Tuesday, June 23, 2009 2:04 PM > To: U2 Users List > Subject: Re: [U2] FW: Valid Backup on Windows Universe > > Kevin Gusler wrote: > >> All - >> >> >> >> We are attempting to enact IBM's double mirrored striped set backup >> alternative. >> >> >> >> This is where your server has a RAID array of 0+1 and then a second Raid 1 >> that is mirrored to the first mirror. >> >> The process as IBM describes it is: >> >> >> >> 1. Quiesce the database (pause all writes, data can still be read, >> > no > >> loss of data) >> >> 2. Split off the second set of mirrored drives >> >> 3. Restart the database >> >> 4. Backup system using split off hard-drives >> >> 5. Rejoin the mirrors >> >> >> >> Has anyone used this scenario in a windows environment? >> >> >> >> Wondering what types of RAID systems people are using? >> >> - (3) Arrays all of which are Raid 0 and in the OS you mirror >> > those > >> RAID 0's >> >> - A Raid 0+1 Array and another Raid 0+1 and then in the OS mirror >> > the > >> 2 Arrays >> >> - (3) Arrays Raid 0+1 and in the OS you mirror the 3 arrays >> >> >> >> Were there any drawbacks to this scenario? >> >> >> >> >> >> Any scenarios that works better? >> >> >> > We use this scenario with aix. Should work ok with windows. As long as > you are using HARDWARE raid, I think it is safe. I wouldn't trust > software raid to this task. > > > _______________________________________________ > U2-Users mailing list > U2-Users@listserver.u2ug.org > http://listserver.u2ug.org/mailman/listinfo/u2-users > > _______________________________________________ > U2-Users mailing list > U2-Users@listserver.u2ug.org > http://listserver.u2ug.org/mailman/listinfo/u2-users > I'm sorry, I am more of a user/dev than sysadmin. Our var set it up for us. What I do know is: AIX 5.3, external drive enclosure with 15 sas drives (I think). 12 are used for the udvg, in what they called a triple-mirror. I know that is not a technical term, but I never pushed the issue to determine what raid level it is. We use tivoli storage manager (that comes with aix) and use mkvgback. We basically do a dbpause, run a script called do-sbom-1, which creates the split mirror /sbom fs, resumes the ud db, startes the backup. After the backup completes to tape, do-sbom-2 is called which rejoins the mirror. It takes like 30 seconds for step 1, 4 hours for backup to tape, and a couple of hours to resync the raid. The users only see a 30second pause. The failure I see of this system is that even though the db is paused, it is not in a "safe" state for backup. The only way to achieve that is to stop all scheduled jobs, logoff oall users, and complete all transactions. Hard to do in a 24-7 business. _______________________________________________ U2-Users mailing list U2-Users@listserver.u2ug.org http://listserver.u2ug.org/mailman/listinfo/u2-users _______________________________________________ U2-Users mailing list U2-Users@listserver.u2ug.org http://listserver.u2ug.org/mailman/listinfo/u2-users
