Linux and Synthetic Backups
Hello everyone,
I'm trying to get a weekly synthetic full backup of my Linux servers going with Backup Exec 2010 (Media server is Windows 2008). I've installed the Linux agent and am able to run regular full, incremental & differential backups from the Linux host. When I create a synthetic backup policy (a copy of the example template generated by Backup Exec) I can run the baseline full backup without any trouble but the incremental backup fails - actually crashes the remote agent is more accruate. The job runs for about 10 minutes and then fails when the remote agent crashes. During its run the data transfer rate is only about 200MB/min while a normal job (without the synthetic option checked) achieves about 1GB/min. The error logged is:
Completed status: Failed
Obviously the above error is simply because the agent has crashed and communication fails. On the console of the Linux server I see:
*** glibc detected *** free(): invalid next size (fast): 0x08234948 ***
I've found that if I uncheck the "Collect additional information for synthetic backup and for true image restore" flag in the incremental job template then the backup runs just fine. Has anyone else seen this problem? The Linux agent is running on Debian 4 & 5 systems. There are a few servers that have completed the incremental job with the synthetic option enabled one night, as scheduled, but then failed the next night. I know Debian isn't officially supported but am hoping that someone out there has got it working.
I still have to investigate further, i.e. wade through the 22MB log file generated, I will post more info as I acquire it but if anyone out there has any suggestions, any help would be appreciated.
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This doesn't appear to be an issue with 64bit systems.... still testing though.
stack dump during testing - on a 64-bit virtual machine:
*** glibc detected *** /opt/VRTSralus/bin/beremote: free(): invalid pointer: 0x00000000023038f0 ***
So apparently it's not strictly on x86 systems, just more likely.
Synthetic backup is combining all Incremental backups to one Full backup. Windows based backups works on Archive bit, this is possible in Windows Backups.
Synthetic backup is not possible in Linux/Unix backups as there is no archive bit mechinism in Linux or Unix.....
Conclusion : Linux does not understand Archive Bit so we wont be able to perform Synthetic backups...
hope this helps...
Its a best practice to have a "Support Contract" with Symantec...
Synthetic backup is possible for LINUX/UNIX
Please read this article http://support.veritas.com/docs/276382 and it will explain how it takes care off archive bit.
You might not have it configured correctly please check the page 879 of admin guide
http://support.veritas.com/docs/276382
FYI
This is a known issue currently under investigation:
http://support.veritas.com/docs/336079
Please mark thread as solved if you consider this to have answered your question(s)
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