Lately there seems to be a lot of press about new 3rd party software to backup all the VMWare Guests that are running rampant at everyones sites. One of he products is Snapmanager for Virtual Infrastructure, which I do plan on testing, another one is a program that I think netapp should purchase called UFS Explorer. We use the UFS explorer program to allow us to connect directly to netapp snapshots of our VM's and we can then do a single file/multi file restores very quickly.

I must say that using UFS explorer is MUCH easier than the VCB option from vmware, and requires no vmware interaction, you just connect to the snapshot and copy the file(s) to the live server as needed. It is still faster to use single file snaprestore to get an entire VM back, but if you only need files from it I recommend this little gem

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My boss just got back from VMWare World in Vegas (hey rank hath its privilige!), he told me he was a bit dissapointed with their NFS presentation. They only talked for a short time, and it was mainly a customer presentation showing the Snapmanager for Virtual Infrastructure product ironically. We havent had a chance to play with that product yet, but we are looking forward to it. I guess VMWare isnt touting NFS for its product as much as Netapp is yet.

We have been VERY impressed with it, and discover little benefits of running our stores via NFS every so often. Recently during a "wonder what will happen" experiment, we decided to see how guest OS's would handle themselves if the connection between the host esx server and nfs datastore went down. Amazingly the machines kept running with no errors, they essentially paused and waited for the connection to be restored. It seems vmware is doing some magic behind the scenes that allow the guests to run, respond to pings, etc, up to the point where NFS times out (default 15 minutes), after that you will get errors. This is one of those "try at your own risk" things, but it is really cool to see it in action!

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Why no Widelinks?

Posted by eswatkins Sep 17, 2008

I have noticed a trend when I talk to other netapp users, whenever I bring up "Widelinks" I get that "Puppy on a Dashboard" stare. Ironically that same response seems to flourish via support as well.  I am not sure if I am the only person who bothered to use the technology, but I find it very useful to make our users lives a little easier.

 

For those that havent used Widelinks, they are a way of making a folder on a filer represent a location on a different volume, or even a different system altogether (CIFS ONLY).  It actually uses a DFS referral to do the magic, but it is easier to setup than DFS.

 

One way we use widelinks is to present a single location users connect to i.e. \\filer1\data which actually has subfolders that are on a mix of FC and SATA storage. We have a \\filer1\data\archives that they can move data that is infrequently accessed, which is on a completely different system (an R200 nearstore), they dont need to remember a second path, or have another drive mapped for it. They just drag and drop from one path on \\rffiler1\data to the \\rffiler1\data\archives.

 

Another way it could be used is to have a central location for geographically dispersed data, we are thinking of using it for software installs where we create a folder for each of our geographic regions and then widelinking to filers in those sites so we can use the same path for all our documentation and package writing.

 

We have also used Widelinks to "migrate" cifs data from one system to another. I snapmirrored the data from one filer to another, setup the shares, and then renamed the source folder, created a widelink folder with the original name and pointed it to the new location. Users never even knew the data had been moved, downtime for the data was less than 5 minutes during a scheduled maintenance window.

 

I have found it helpful to use widelinks and hope you all do to, if you want to experiment with them there are numerous papers on the NOW site, and a tool called LN.exe that is useful if you arent unix oriented!

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Welcome to the Trenches

Posted by eswatkins Sep 17, 2008

My name is Eric Watkins and I have been working at a semiconductor manufacturing company and dealing with Netapp since 2000. I am currently responsible for around 250TB of storage that is accessed via FCP, ISCSI, NFS, CIFS, snapmirror, and snapvault protocols.

I decided to start a blog on things that may not neccessarily be in anyone best practices guide, but can work in the "real world". Many of these things will have the disclaimer "try at your own risk", others may be more supported and hold true to the documentation.

Here we go, Welcome to the Trenches!

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