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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 [...]
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 [...]
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 [...]
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 [...]
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 [...]
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 [...]
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 [...]
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 [...]
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 [...]
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 [...]
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