EMC VNXe Data Protection with Symantec Backup Exec

EMC recently launched their new VNX storage line which is a unified storage platform with one management framework supporting file, block, and object optimized for virtual applications. From that line they also produced a more affordable “VNXe” model for small business and remote offices. There are a number of ways to protect the VNXe including snapshots, replication and NDMP backups. Typically I would use a couple different combinations of these three technologies depending on the business need and data risk, but today I am only going to go into detail with backing up the VNXe using Backup Exec as it is the most popular choice for small and medium businesses which is fitting for the VNXe.

Unable to Connect to the OpenStorage Device

Unable to connect to the OpenStorage device. Ensure that the network is properly configured between the device and the media server.

Backup Server: Symantec Backup Exec 2010 R3
OpenStorage Device: DataDomain DD670 running

Today I was configuring DDBOOST for Backup Exec 2010 R3 using a replicated pair of DD670’s. The DD670’s were pre-configured with version 4.9 which I upgraded to I setup the 670 with a standard configuration and then configured a storageunit.

Troubleshooting: A checkpoint validation (hfscheck) of server checkpoint data is overdue.

Event ID: 114113

Checkpoint validations (hfschecks) of server Checkpoints are performed to ensure that checkpoints are valid for disaster recovery needs. A regularly scheduled hfscheck did not take place as scheduled. If hfschecks are not being performed disaster recovery may not be possible.

Check to make sure that checkpoint is configured and enable it if it’s not. Check to make sure checkpoint validation is configured and enable it if it’s not. If checkpoint and validation are enabled and schedule and either no checkpoint was taken or no validation occurred, contact your support center.

Best Practices for Backup Exec Deduplication

How Backup Exec Deduplication Works:
Deduplication works by dividing data into 128K segments and then storing the segments in a deduplication storage folder, along with a database that tracks the segments. Data is not stored again when a backup encounters a segment that is already stored in the deduplication storage folder. So, if you back up the same unchanged file over and over again, it is stored only one time in the deduplication storage folder.

Where the Backup Exec Deduplication Option Works Best
Deduplication only happens when the Deduplication Option detects blocks of data that are in fact the same. Operating system files deduplicate well. They are the same across multiple systems and do not change often.

Deduplication works well in the following scenarios:
? With Windows and Linux file system data
? Where the same file is backed up multiple times
? Where the percentage of data that changes is small

Where Other Backup Exec Options Work Best
Deduplication does not work well if data changes frequently or if the Deduplication Option cannot detect the duplicated blocks of data. For example, when a new bit of data is inserted at the beginning of a large file (VMDKs), the blocks of data are shifted so that none of them will match. Therefore, the file is not deduplicated.
This segment shift works against the Deduplication Option in cases where a non-file system backup is sent to the deduplication storage folder. These backups appear as one very large stream to the deduplication storage folder. Because of this, adding data early in the data stream causes the rest of the data stream to deduplicate poorly, if at all (Example: Exchange Database maintenance).
The good news is that in these cases, some Backup Exec agents can avoid backing up duplicate data with the use of traditional differential and incremental backup techniques. For example, when backing up VMWare or Hyper-V virtual machines, significantly better deduplication rates will be achieved by ensuring the Backup Exec Agent for Windows Systems is installed in each of the virtual machines and backing those machines up as though they are physical machines. Doing so allows the deduplication option to read each of the files and folders within the virtual machine and deduplicate
those individual files. (NOTE: The Agent for VMWare Virtual Machines and the Agent for Microsoft Hyper-V licenses allow for unlimited usage of the Agent for Windows Systems within the same host machine.)
Expectations for the Deduplication Option
Deduplication is data-dependent. That is, the amount of deduplication that you are going to get out of a particular data set depends on what is in the data set. Data that is all unique is not going to benefit from deduplication. Data that contains many copies of the same data will benefit from deduplication.
If there is a terabyte of source data that doesn’t have any duplicate information in it, the deduplication storage folder is going to need a terabyte of space to store it.

A deduplication storage folder has significant memory and disk space requirements. Make sure to review the requirements for the Deduplication Option before implementing it. While the option may initially work on a system that does not meet these requirements, as time goes by and the deduplication storage folder fills up, a lack of memory and disk space will cause problems.

A deduplication storage folder is significantly more complex than a backup-to-disk folder. Detecting duplicate data, tracking it in a database, and managing the interconnected links in the deduplication folder all adds up to significant memory and CPU usage. Memory, processing, and time is traded for reduced storage space requirements. This trade-off needs to be considered when choosing to use a deduplication storage folder over a backup-to-disk folder.

Avamar Backup Job fails with error code 10007

I noticed a recent NDMP backup failed with error code 10007, here is the job log information:

2010-12-01 08:00:45 avndmp Error : Snapup of “ndmp-volume-name” aborted due to ‘Error during NDMP session’.
2010-12-01 08:00:45 avndmp Info : NDMP session result: avtar returned:176 ‘Fatal signal’ ndmp returned:157 ‘Miscellaneous error’
2010-12-01 08:00:45 avndmp Info : Final summary generated subwork 1, cancelled/aborted 1, snapview 0, exitcode 157
2010-12-01 08:00:45 avndmp FATAL : Fatal signal 11 in pid 21946
2010/12/01-08:00:45.23164 [avndmp_ctl_sup] FATAL ERROR: Fatal signal 11

[sociallocker id=”759″]I’m still investigating and will update the post when i find out the root cause.  [/sociallocker]

How to shutdown Avamar

The following is the procedure to Shutdown Avamar GSAN:
1. Log on to the system as user admin.

2. Load the ssh keys
ssh-agent bash
ssh-add .ssh/admin_key

3. Verify hfscheck and garbage collect are not running.
ps -eaf|egrep “gc_cron|cp_cron|hfscheck_cron”

If hfscheck is still running, run “hfscheck_kill” as user admin to kill it off.
If GC is still running, you will need to let it finish before continuing.
If CP is running, you will need to let it finish running.

4. Take a checkpoint (as dpn)
su – dpn
ssh-agent bash
ssh-add .ssh/dpnid
cp_cron –duplog
exit (Note..you should now be back to admin)

5. Stop the EMS and MCS


dpnctl stop ems

dpnctl stop mcs

6. Stop the GSAN

7. Verify avamar is shutdown

dpnctl status

In this output it shows avamar is down:

dpnctl: INFO: gsan status: down
dpnctl: INFO: MCS status: down.
dpnctl: INFO: EMS status: down.
dpnctl: INFO: Scheduler status: down.
dpnctl: INFO: Maintenance operations status: suspended.
dpnctl: INFO: Unattended startup status: disabled.
dpnctl: INFO: [see log file “/usr/local/avamar/var/log/dpnctl.log”]

Now you can safely power off the hardware.

How to check node capactiy across an EMC Avamar grid

I recently came across an issue where the avamar garbage collect was not running. When I run a status.dpn on the grid I get the following message for the garbage collect status:

Last GC: finished Wed Aug 25 01:01:04 2010 after 00m 50s >> recovered 0.00 KB (MSG_ERR_DISKFULL)

The total grid utilization is currently at 87% and I also saw some Unacknowledged Events with the following information:

Code: 4202 Message: failed garbage collection with error MSG_ERR_DISKFULL

This error is a direct result of the garbage collect run limit being reached or exceeded due to excessive checkpoint overhead. To verify and check all of the node capacities use the following commands; also if this is a single node you will not have to use the mapall command.

su – admin

ssh-agent bash

ssh-add ~admin/.ssh/admin_key

Enter the passphrase for the admin keys. (If you dont know what it is then you should not be doing this) Then run:

mapall –noerror ‘df -h’

This should give you the filesystem for each node including the sizes, used, and space available. Then run:

avmaint nodelist | grep percent-full

This will give you a cleaner output of the numbers that really matter. Pay attention to each node’s “abs-percent-full”

In most cases you should contact EMC support to resolve this issue, however in some cases running an HFS check or checkpoint validation on your oldest checkpoint might free up enough overhead to get you back on track.

Backup Exec 2010 R2 has been released

Backup Exec 2010 R2 is the second release of Backup Exec 2010 and is generally available to all users starting today, August 2nd, 2010.

This release features improvements in usability, licensing and renewal management, deduplication, virtualization, and extends platform and application support. Here are some of the most important features that the release introduces…

•Enhanced Installation and backup wizards reduce the time and complexity of setting up your backups
•Backup recommendation tool identifies potential gaps in your backup strategy and provides recommendations on the agent(s) required to ensure complete data protection.
•Integrated RSS and Renewal Assistant help keep you informed and current.
•NEW! support for SharePoint 2010, Exchange 2010 SP1, Microsoft SQL 2008 R2, Enterprise Vault 9, Mac OSX 10.6, NDMP NetApp ONTAP 8.0, EMC DART 6.0, and OST support for Data Domain DDOS 4.8 with Boost Technology.

And time for some good news..customers who are current with maintenance or support contracts for previous versions of their licensed Backup Exec software can upgrade to the appropriate Backup Exec 2010 R2 licenses at no additional charge.