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5230 Appliance hangs after the tape out process

Hi, 

 

Our of the customer has a 5230 appliance it has a serious performance problem. they are performing tape out operation for weekly full backups. and they perform that tape out process with a slp windows which is running 8 am to 5pm. their mostly tape out process happening on monday and their monday schedule backups affected badly. for example one of the vm clients backup working with a 300 mb/s ( acc enable ) when there is no performance problem, but after the tape out process same client backups working with a 20 mb/s. we are rebooting appliance and then restart affected clients backup after the reboot, its working nearly 250 or 300 mb/s. without the bandwidth the snapshot creation process takes nearly 18mins when the appliance has a bad performance. after the reboot same snapshot process takes 2 mins.

1 Solution

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Accepted Solution!

Re: 5230 Appliance hangs after the tape out process

14 tape drives x 256 buffer x whatever your size is .....

I am with Marianne here .. way too many drives and too many buffers.

Reduce the Storage unit to 4 and see how it goes then ... that will usually be the most you will get out of anything

If you want to use 14 drives get another 3 appliances to use them wink

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6 Replies

Re: 5230 Appliance hangs after the tape out process

1) What version?

2) How many tape drives write concurrently at the same time?

3) Roughly how much, total TB, gets duplicated to tape - i.e. roughly how big is the weekly backup job set?

4) Are the tape drives directly connected to the appliance, or are they hanging off of another different media server somewhere else in the network?

Re: 5230 Appliance hangs after the tape out process

Very unusual for an appliance so we need to know your settings.

Which model of appliance (A, B, C, D etc.) .. which version of NetBackup .... what are your disk and tape buffer numbers and sizes .. what type of tape (LTO4 / 5 / 6)

Also what is the current process queue size on the appliance and how full is your disk pool (what size and how much free)

All of these make a difference so please try and answer all of these and sdo's questions

Hi Sdo, 1 - we are using

Hi Sdo,

 

1 - we are using 2.6.1.2

2- 14 tape drives running at a same time

3- nearly 35 - 40 TB data duplicated.

4- there are only appliance media server been there and tape device connected through san directory

customer use E series of

customer use E series of appliance. number_data_buffer is 30 and number_data_buffer_disk is 256 ( decreasing the number_data_buffer parameter we are getting high performance during tape out. ) There lto 6 tape drives. current disk pool usage is % 60. 

Re: 5230 Appliance hangs after the tape out process

14 tape drives simultaneously? Way too many. I have never seen any media server being able to stream more than 4 tape drives simultaneously at sustained rate of over 100MB/sec.
Accepted Solution!

Re: 5230 Appliance hangs after the tape out process

14 tape drives x 256 buffer x whatever your size is .....

I am with Marianne here .. way too many drives and too many buffers.

Reduce the Storage unit to 4 and see how it goes then ... that will usually be the most you will get out of anything

If you want to use 14 drives get another 3 appliances to use them wink

View solution in original post