RDM and VCB Performance

I have RDMs finally backup via VCB no problem... other than the performance is terrible. The level of the files back ups seem to. But when I do a fullvm it seems to back up the whole ROW, without worrying whether it has data on it. I presented a lun 500 GB as a test, put a few text files, has launched a backup and it takes hours to complete. We are talking about a few kilobytes here. In this case, if I use the BEIM or native vcbmounter... same results. It is not the SAN... performance is stellar other than this activity. Is this expected behavior? VCB is not smart enough to know if there are data on the RDM or not? I've seen some other posts to this topic, but has never seen no resolution. Just curious, if you have any ideas. It is good to be a better way.

Ok. By default, VCB will back up fragmented file as long as you do not pass the-m or F - mode export flags is not transmitted:

Flags of export:

-M: If, together, the disk is exported in a single file (monolithic).

When it is off (default), the disc is divided into several files of 2 GB.

-F: so together, the disk is exported in the form of disc "flat", with no optimization.

When it is off (default), the exported files disk will be more compact than

unused space in the disk image is not included in the exported file.

The BEST you will get with backups of type fashion SAN FullVM is about 1 GB / minute. It is still slow down with RDM, because they must be converted VMDK when FullVM saving. You know that if you practice a full recovery from the virtual machine (you'RE done this right?). When you retrieve a RDM saved using VCB, it becomes a VMDK.

RDM are das LUN in the native OS file system format (NTFS, ext3, etc), you may be better using an agent or perform file-level backups. Think about why you use a RDM. If you are recovering to a VMDK, what are the consequences. If there is not, amounted to a VMDK and be done with it. If there ARE implications use of files or agent in function of the backups. If this ROW is for a file server, or either method is fine. If they are boxes in the letters or databases, you better make backups of basis unless you REALLY know how to recover a database store or potentially incompatible mail. The driver of the sync and VSS providers are not a guarantee that you will be able to recover.

Dave Convery

VMware vExpert 2009

http://www.dailyhypervisor.com

Prudent. We do not want to make of this.

Bill Watterson, "Calvin and Hobbes".

Tags: VMware

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