The holiday season is upon many of us – whether you celebrate xmas or christmas, or just the new year according to the Julian calendar, we’re approaching that point where things start to ease off for a lot of people and we spend more time with our families and friends.

Before I wrap up for the year, I wanted to spend a few minutes reintroducing some of the most popular topics of the year on the blog – the top ten articles based on directly linked accesses. Going in reverse order, they are:

  • Number 10 – “Why I’d choose NetWorker over NetBackup every time“. I was basically called an idiot by someone in the storage community for writing this, but the fact remains for me that any backup product that fails to support backup dependencies is not one that I would personally choose. Given that a top search that leads people to the blog is of the kind, “netbackup vs networker” or “networker vs netbackup”, clearly people are out there comparing the two products, and I stand by my support of the primacy of backup dependency tracking.
  • Number 9 – “A tale of 4 vendors“. A couple of months ago I attended SNIA’s first Australian storage blogger event, touring EMC, IBM, HDS and NetApp. Initially I’d planned to blog a fairly literal dump of the information I jotted down during the event, but I realised instead I was more drawn to the total solution stories being told by the 4 vendors.
  • Number 8 – “NetWorker 7.5.2 – What’s it got?“. NetWorker 7.5 represented a big upgrade mark for a lot of sites, particularly those that wanted to jump the v7.3 and v7.4 release trees. I still get a lot of searches coming to the blog based on NetWorker 7.5 features and upgrades.
  • Number 7 – “Using NetWorker Client with Opensolaris“. This was written by guest blogger Ronny Egner, and has seen more interest over the last few months as Oracle’s acquisition continues to grind down paid Sun customers. If you’re interested in writing guest blog pieces for the NetWorker Blog in 2011, let me know!
  • Number 6 – “Basics – Fixing ‘NSR peer information’ errors“. I’ve said it before, and I’ll say it again: there is no valid reason why the resolution for this hasn’t been built into NMC!
  • Number 5 – “NetWorker and linuxvtl, Redux“. The open source LinuxVTL project continues to grow and develop. While it’s not suited for production environments, LinuxVTL is certainly a handy VTL to plug into a NetWorker/Linux system for testing purposes. I know – I use it almost every single day.
  • Number 4 and Number 3 – “NetWorker 7.6 SP1“. Interest in NetWorker 7.6 SP1 has been huge, and I had two blog postings about it – a preview posting based on publicly shared information from EMC, and the actual post-release article that covered some key features more in-depth.
  • Number 2 – “Carry a Jukebox with you (if you’re using Linux)“. The first article I wrote about the LinuxVTL project.
  • Number 1 – “micromanual: NetWorker Power User Guide to nsradmin“. The Power User guide to nsradmin has been downloaded well over a thousand times. I’ve been a fan of nsradmin ever since I started using NetWorker and had to administer a few NetWorker servers over extremely slow links (think dial-up speeds). It’s been very gratifying to be able to introduce so many people to such a useful and powerful tool.

Personally this year has been a pretty big one for me. Probably the biggest single event was that my partner and I made the decision to move from central coast NSW to Melbourne, Victoria during the year. We haven’t moved yet; it’s due for June 2011, but it’s going to necessitate a lot of action and work on our part to get there. It’ll be well worth the effort though, and I’ve already reached that odd point where I no longer think of the place I’m living as “home”. The reasons that led us to that decision are covered on my personal blog here. Continuing the personal front, I was extremely pleased to be able to say goodbye to the mobile “netwont” that is Vodafone in Australia. I’ve been using my personal blog to talk about a lot of varied topics running from internet censorship to invasive information requests to more mundane things, such as what makes a good consultant.

Technically I think the coming few years are going to be fascinating. Deduplication has only just started to make a splash; I think it’ll be a while before it becomes as pervasive as say, plain old disk backup, but it will have a continued and growing effect in the enterprise backup market. I predict that another bevy of dopey analysts will insist that tape is dead, just like they have every year for the last 2 decades, and at the end of the year I predict the majority of companies they interface with will still be using tape in some form or another. However, the use of tape will continue to evolve in the marketplace; as nearline disk storage becomes more regular and cheaper for backup solutions, we’ll see tape continue to be pushed out to longer term retention systems and safety nets – i.e., tape is certainly sliding away from being the primary source for recoveries in an enterprise backup environment.

One last thing – I want to thank the readers of this blog. To those people who subscribe to the mailing list, and those who subscribe to the RSS feed, to those who have the site bookmarked and to those who just randomly stumble across the site – I hope in each case you’re finding something useful, and I’m grateful for your readership.

Happy holidays to those of you celebrating or relaxing over the coming weeks, and peaceful times to those working through.

 

I thought it about time that I cited the two key reasons why, if faced with a choice between NetWorker and NetBackup, I would choose NetWorker every time.

As you might expect, given my focus on backup as insurance, both of these reasons are firmly focused on recovery. In fact, so much so that I still don’t really understand why EMC doesn’t go to market with these points time and time and time again and just smack Symantec around until it’s blue in the face and begging for mercy.

Reason 1: NetBackup does not implement backup dependencies

I struggle to call NetBackup an “enterprise” backup product because of this simple fact. Honestly, backup dependencies are critically important when it comes to guaranteeing anything but last-backup recoverability.

What does this mean?

In short, as soon as a backup hits its retention period in NetBackup, it’s toast – it’s a goner.

Irrespective of whether there are any backups of the same filesystem/data set that requires the “outside retention” backup for recovery purposes.

I can’t sum this up any other way: in a backup product, I see this as recklessly irresponsible. It provides a focus on media savings that even the most miserly bean cruncher would admire. Well, until the bean cruncher’s system can’t be recovered from 6 weeks ago to fulfil audit requirements.

Reason 2: True Image Recovery is “optional”

If you’ve grown up in a NetWorker world, where the emphasis has always been, and will always continue to be on recovery, this will, like the reason above, make you soil yourself. Imagine having a full backup plus six incremental backups of a directory, and wanting to recover the filesystem from last night. Now imagine just selecting the full plus the incrementals for recovery and getting back everything generated during that time.

Even the files that had been deleted between backups. I.e., you don’t get back what the filesystem looked like at the time of the backup that you’re recovering from, but what it looked like for every backup that you’re recovering from.

NetWorker, once, in the 5.5.x stream implemented this. It was called a BUG. In NetBackup, it’s a “feature”. In order to enable a correct recovery, you have to turn on “true image recovery”, something that takes extra resources, and is typically advised  that you keep the data just for a small cycle (e.g., 7 days) rather than the complete retention time for the backups.

There’s another word for this: Joke.

On another front…

As recently as December I mentioned that I wished EMC would get their act together and implement inline cloning – one of the few things where I saw that NetBackup had a distinct competitive advantage over NetWorker.

Maybe it was the glow of the cider, but I had an epiphany in Copacabana on a hill watching (probably illegal) fireworks in Avoca and Terrigal on new years eve. Inline cloning is no longer a compelling factor in a backup product. Why? Media streaming speeds have reached a point where companies with serious amounts of data just should not be implementing direct-to-tape backup solutions any more. Inline cloning was developed at a time when you’d want to generate both sets of tapes as quickly as possible, but only companies with very small data sets will find themselves not backing up to some disk unit first (be it say, ADV_FILE, or VTL, in NetWorker), and those companies won’t be constrained on backup/clone windows to a point where they’d need inline cloning anyway.

When not backing up direct-to-tape, there are several factors that mitigate the need to do inline cloning. In organisations with a very strong need for offsiting, there’s replication at a VTL or disk backup unit layer. In organisations that just need a second copy generated “as soon as possible”, doing disk/virtual tape to physical tape cloning following the backup should be fast enough to handle the cloning at appropriate performance levels.

In other words: there’s no need for EMC to implement inline cloning. As a technology, it’s a dead-end from a tape-only time. I feel somewhat silly this didn’t occur to me sooner.

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