Persist cache dedupe 'freezes' Appassure

Have a server Appassure with 144 GB of memory and two time deposits. One at 7TB and one at 13 to. Have set the cache to be 60 GB. But, after increasing the cache I see the persistence of deduplication, cache work takes much longer. And when this working at pretty much everything else is on hold. What does this work? And it will get faster because the service of Appassure worked longer?

Hi Wes,

Little bit of background, whenever a block is retrieved on the protected server, it checks the cache of deduplication to see if there is a hash corresponding to this block.  If so, it records a pointer in the repository, if it is not she saves the entire block in the repository.  It took a while to get this information from Dell and I had a ticket open for about 6 months, going back and forth with me call b & * $h! t until I got the final answer.

I can only offer my personal experiences, but it was the number 1 for me reason upgrading to 5.4 and actually made me before I do (what I thought would be more stable) 5.4.2 release

WES

(1) when I use it? Would it not good for a server that has a lot of changes to the same files. For example, a SQL / server Exch but not good for a server that has little change or new files.

(2) related to the previous question, if 1 server type benefits of this feature, but the other does not it seems that these servers should be subdivided into different pensions and deduplication cache must be specific to each repo but is not. Its a basic setting

My personal experience has been that I would use it if I have any great server that is being backed up, even more so those that experience of very small amounts of change, but a new basis can take.

For example, if I have a file server of 5 TB, only changes of 20 GB per day and it is replicated.  (for the sake of arguments, I am also protect other servers).  When this server takes a new base image the following will happen.

  1. Under the cover of deduplication small virtually all of this will be written up in the repository, the size of the server, probably filling up and run me around deleting recovery points just to make sure I have space.  Worse, it will be so try and replicate all across the wire as it exists on the target site is and does basically no off-site backups, until I can fix this big transfer.
  2. If only I size my deduplication in cache so that it can cache the pointers to the repository, and then when he takes a new base image, it recognizes the fact that 99% of it is already in the repository has need of space for what is essentially a differential.  Much easier to manage and much less consuming for replication.
WES
(3) what does this feature do? Is it supposed to speed up backups, replication or something else? If it is meant to accelerate certain measures, what is it and what examples do you have of the speed increase?

Reduce storage requirements and speed of replication, for me, especially when a new base image is taken on a server when data has left the cache, the means, it does not record everything in the repo and enough to reproduce pointers.

WES
(4) If this feature is supposed to save disk space, the amount of disk space, it can record using the examples in the real world

I had this happen (small server, only 600 GB, but it usually take a week to duplicate off site, when a new base was taken, with the biggest cache, it took)<60>

It will be similar to large servers.  Space saving probably only when base images are taken and not much when they are not.

I also used to have a core of slave who was 5.3, which used the 2 TB for all RPs, I've updated that to 5.4 and replicated to a new kernel (largest cache).  This kernel with the same SRP used only 1.5 to.  Would have been more radical if I didn't dedleted all images in database in the past.

WES
(5) what is the reason for the dumping of RAM memory for discs I know its to protect the cache, but I don't understand how or why. Is the cache in RAM very sensitive to corruption? How he'd notice that RAM is corrupt and have to choose among the primary or secondary, and how can tell us if the RAM gets corrupted? What are some possible causes of cache corruption?

It only loads the cache of the disk at startup, just so there references after a reboot when RAM has been emptied.  When you save, it saves on primary and secondary (maybe the other way around).  I guess it's so that if the server goes down to halfway through, he always has a cache coherent to load from (and complete)

Is not put to secondary main day, basically, RAM > primary then RAM > secondary

WES
(6) there is any number of performance that this feature records that we can use?

Not that I have seen, but I'm sure there must be options under the new section "tracing".

WES
(7) if we have several rest on a core, cache dedup will protect all the rest (assuming that its size correctly) it will create different caches for each repo or rest all use a single cache? Are there problems with this

The cache is to protect all the rest, no option for separate cache by repo.  Also, no option to recreate the repo cache or move the cache to another server, as you can for a repo.

I have

WES
A feature which can easily take up to 50% of physical memory is huge. 50% of my memory for a single feature and then I have to have the memory available for the actual backups. Also, it seems hard to imagine a feature in development of performance that locks the system and stop the activity for 10-15 minutes empty RAM every 15-60 minutes.

Hmm, Yes.  This is ridiculous and if you thought it took awhile to start/stop the service before, wait until you have a large cache.  I made the change to everyday, as I said, if I lose the cache for recent stuff I'm not too worried, I'm more interested in protecting the cache against these basic images that kill the replication and storage.

To you if you can cope with him personally< i="" can't="" cope="" without="">

It finally gives them the point of sale of the ' global deduplication cache ' that they have been advertising since 5.2 but was really 'recent dedupe cache'

Hope that helps

Tags: Dell Tech

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