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Allow multiple backup jobs

Created: 16 Jun 2010 | 10 comments

Currently we are backing up, up to 15 NBU clients, scheduled between 9pm and 6am. And Each client sits in a queue until the one before it completes. Basically only 1 is running at a time.

Is there a way to allow multiple backup jobs to takeplace at one time?

Each client is scheduled to backup to Disk and Tape at the same time, as multiple copies. we have one Disk STU, and one Tape STU which there is only 1 tape drive.

We are using NBU 7.0

Thanks

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Andy Welburn's picture

Storage Units:

Maximum concurrent jobs

The Maximum concurrent jobs setting specifies the maximum number of jobs that NetBackup can send to a disk storage unit at one time. (Default: 1 job. The job count can range from 0 to 256.) This setting corresponds to the Maximum concurrent write drives setting for a Media Manager storage unit.

If three backup jobs are ready to be sent to the storage unit and Maximum concurrent jobs is set to two, the first two jobs start and the third job waits. If a job contains multiple copies, each copy applies toward the Maximum concurrent jobs count.

Caution: To specify a Maximum concurrent jobs setting of 0 disables the storage unit.
Maximum concurrent write drives

The Maximum concurrent write drives setting specifies the number of tape drives that NetBackup can use at one time for jobs to this storage unit. The number of tape drives available is limited to the maximum number of tape drives in the storage device. If a job contains multiple copies, each copy applies toward the Maximum concurrent write drives count.

Select one number for a:

•storage unit that contains only stand-alone tape drives. Specify a number that is less than or equal to the number of tape drives that are in the storage unit.
•robot. Specify a number that is less than or equal to the number of tape drives that attach to the NetBackup media server for the storage unit.

Assume you have two stand-alone drives of the same density and specify 1. Both tape drives are available to NetBackup but only one drive can be used for backups. The other tape drive is available for restores and other non-backup operations. (For example, to import, to verify, and to duplicate backups.)

Caution: To specify a Maximum concurrent write drives setting of 0 disables the storage unit.

***EDIT*** Ignore that last bit I just noticed you say you only have one drive!! blush

What I actually meant was check the multiplexing value - we have ours maxed out at 32 & then reduce as necessary at the policy level.

 

drumatic87's picture

Thanks for that.

Since our policies are set to multiple copies (1 to Tape, 1 to disk) and we only have 1 tape library with 1 tape drive, will it only be able to write 1 job at a time?

We have an IBM TS3100 tape library, with 1 tape drive.

Andy Welburn's picture

'normal' scheme of things (unfortunately we don't utilise multiple copies nor backup to disk & it's not something I could readily test for you at the moment), then setting multiplexing levels correctly should allow more than one backup job to 'stream' to a tape drive.

Do you have any other policies that multi-stream or is this the only set-up you have running (i.e. the multiple copies)?

drumatic87's picture

Yes at the moment, all policies send multiple copies to disk and tape.

I've enabled multiplexing and set 10 streams per drive on the tape drive STU, and each policy will still queue until the one running is complete.

Also allowed multiple data streams in the policy and multiplexing on each schedule with 4 streams per drive. still only running 1 job at a time.

Andy Welburn's picture

as well as the STU settings above, you could check the max jobs per policy setting & the media multiplexing setting in the schedule(s)

Ed Wilts's picture

Personally, I would not take this approach.  I'd write to a DSU or DSSU first and then duplicate images to tape.  I think you'll be happier with this approach than trying to do simultaneous copies to disk and tape.

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drumatic87's picture

Thanks Ed, What would be the best way to set that up?

Currently each backup job runs multiple copies, one to disk and to tape. In the Disk STU config if i enable temporary disk staging area, it only lets me select 1 tape pool. but we have differnt pools for differnt backup schedules. Weekly pool, Daily pool and Monthly pool.

Weekly pool = Full backup once per week
Daily pool = Cumulative every day
Monthly = Fullbackup once per month, with greater retention period.

Ed Wilts's picture

Simplify the pools - these probably aren't doing what you think they're doing anyway.  You only need 1 pool.  NetBackup, by default, will not mix retentions on the same tape anyway so all your daily backups will sit on distinct tapes from your weekly and monthly tapes.

In general, NetBackup does a really, really good job of scheduling and managing media.  Try not to get in its way and let it do its job.  This goes with schedules (avoid calendar schedules unless you no other choice) and don't create extra tape pools.

You can use either Vault to duplicate the disk images to tape or you can use Storage Lifecycle Policies (SLP) to create your second copy - both work but SLP is free and Vault requires a license.

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drumatic87's picture

Thanks for that.

I think we will place all our tapes into one pool and use disk Staging.

Although, will the retention periods in the disk schedule be the same for the tape that is used at the time of the backup?

Eric Zhang's picture

yes, for the Disk Staging , the retention period will keep the same .

Eric

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