micromanual for nsradmin

Join hundreds of others and download the NetWorker Power User's micromanual for nsradmin. Check this blog article for details.

Enterprise Systems Backup and Recovery

If you have an interest in, or work in data protection/backup and recovery environments, you should check out my book, Enterprise Systems Backup and Recovery: A Corporate Insurance Policy. Designed for system administrators and managers alike, it focuses on features, policies, procedures and the human element to ensuring that your company has a suitable and working backup system.

 

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Archives

7.5.2 and ADV_FILE devices

There is a bug with the way NetWorker 7.5.2 handles ADV_FILE devices in relation to disk evacuation. I.e., in a situation where you use NetWorker 7.5.2 to completely stage all savesets from an ADV_FILE device, the subsequent behaviour of NetWorker is contrary to normal operations.

If following the disk evacuation, either the standard overnight volume/saveset recycling [...]

ADV_FILE operational changes

As I mentioned in an earlier post, EMC have announced on their community forum that there are some major changes on the way for ADV_FILE devices. In this post, I want to outline in a little more detail why these changes are important.

Volume selection criteria

One of the easiest changes to describe is the new volume [...]

Coming ADV_FILE changes

I had been aware for a while from an NDA conversation that these changes were on the way, but of course have not been able to discuss them.

However, with EMC opening up discussion on the EMC Community Forum – i.e., out in public, I now feel that I can at least discuss how excited I [...]

10 reasons why tape is still important (part 2)

In the previous article, I covered the first five of ten reasons why tape is still important. Now, let’s consider the other five reasons.

6. Tape is greener for storage

Offline storage of tape is cheap, from an environmental perspective. Depending on your locality, you may not even have to keep the storage area air-conditioned.

Disk arrays and [...]

Ten reasons why tape is still important (part 1)

Various companies will spin you their “tape is dead” story, and I’m the first to admit that the use pattern for tapes is evolving, but to anyone who claims that tape has lost its relevance, I’ll argue otherwise.

This is part 1 of a 2 part article, and we’ll cover reasons 1 through 5 here.

1. Tape [...]

ADV_FILE devices and tape rotation strategies

While I touched on this in the second blog posting I made (Instantiating Savesets), it’s worthwhile revisiting this topic more directly.

Using ADV_FILE devices can play havoc with conventional tape rotation strategies; if you aren’t aware of these implications, it could cause operational challenges when it comes time to do recovery from tape. Let’s look at [...]

EMC, Data Domain, VTLs and Disk Backup

With their recent acquisition of Data Domain, some people at EMC have become table thumping experts overnight on why you it’s absolutely imperative that you backup to Data Domain boxes as disk backup over NAS, rather than a fibre-channel connected VTL.

Their argument seems to come from the numbers – the wrong numbers.

The numbers constantly quoted [...]

Quibbles – The maddening shortfall of ADV_FILE

Everyone who has worked with ADV_FILE devices knows this situation: a disk backup unit fills, and the saveset(s) being written hang until you clear up space, because as we know savesets in progress can’t be moved from one device to another:

Honestly, what makes me really angry (I’m talking Marvin the Martian really angry here) is [...]

NetWorker on Linux – Ditching ext3 for xfs

Recently when I made an exasperated posting about lengthy ext3 check times and looking forward to btrfs, Siobhán Ellis pointed out that there was already a filesystem available for Linux that met a lot of my needs – particularly in the backup space, where I’m after:

Being able to create large filesystems that don’t take exorbitantly [...]

When will tape die?

As you may have noticed, I have a great deal of disrespect for “tape is dead” stories. To be blunt, I think they’re about as plausible as theories that the moon landing was faked.

So I thought I might list the criteria I think will have to happen in order for tape to die:

SSD will need [...]