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Extremely Slow Backup on Linux Client

How can I troubleshoot network issue with Netbackup and Linux clients.

I have Netbackup 7.1 running on Windows Server 2008 backing up several Linux and Windows clients.

In one Linux client in particular the backup runs extremely slow. 5.5 TB data takes more than 60 hours to complete. Recently had error 41 and restarted the netbackup client services. Now even the daily backups with 16GB data takes 18 hours to complete.

In comparision another Linux client with 7.7 TB data takes only 22 hours to complete.

Both the clients are connected to the network through bonded 10G connection to the same switch and the Netbackup LTO5 drives are connected to the same switch through a 10G fiber channel.

Please advice how I can rectify this issue.

Thanks in advance.

1 Solution

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Accepted Solution!

Re: Extremely Slow Backup on Linux Client

Hello,

perform file copy test outside NetBackup - copy a file between this client and Media Server if it is also slow.

If it won't be slow, then it could be a client with many small files, is not this the case?

If it is, consider FlashBackup type of backup (see Snapshot Client Guide if it is supported for your client), or try splitting data volume into smaller paralelly backed-up portions - multistreaming on the client with multiplexing on the Media Server.

Michal

View solution in original post

8 Replies
Accepted Solution!

Re: Extremely Slow Backup on Linux Client

Hello,

perform file copy test outside NetBackup - copy a file between this client and Media Server if it is also slow.

If it won't be slow, then it could be a client with many small files, is not this the case?

If it is, consider FlashBackup type of backup (see Snapshot Client Guide if it is supported for your client), or try splitting data volume into smaller paralelly backed-up portions - multistreaming on the client with multiplexing on the Media Server.

Michal

View solution in original post

Re: Extremely Slow Backup on Linux Client

You can also try the bpbkar null test and null STU test

Re: Extremely Slow Backup on Linux Client

Was it ever fast?

What is the nature of the data?

why are the 10gbe nics bonded?

What is the networking on the media server?

How long has everything been hooked up exactly as it is now?

Re: Extremely Slow Backup on Linux Client

fwiw, in a similar case here, we created another media server for the problem client.

Re: Extremely Slow Backup on Linux Client

The first step is to test read speed from disk as per previous posts. 

See : 
Measuring disk performance with bpbkar 
http://www.veritas.com/docs/000076349 

On a Unix/Linux client you can also do a tar backup of the folder/filesystem to /dev/null and check how long it takes:
time tar cBf /dev/null /folder

When read performance from disk is good, test network performance - ftp +- 2GB file to media server and see how long it takes.

 

Use the  GEN_DATA

Use the  GEN_DATA directive.

This will random generate data in memory from the client, but will transmit data all they way to tape as was it real data. Doing this will tell if the problem is tranmission lines or the problem is located on the client file system. And by the way, you can restore the data as well. But restored data will not occupy disk space, it will dissolve in memory on the client :)

http://www.veritas.com/docs/000091135

 

Re: Extremely Slow Backup on Linux Client

where can I find the syntax for these tools mentioned for Windows OS?

Re: Extremely Slow Backup on Linux Client

How to benchmark the performance of the bpbkar32 process on a Windows client
http://www.veritas.com/docs/000013839