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windows volume containing local and SAN disks


I have a Windows 2008 file server which has internal SCSI drives, I have a data volume on the server which is nearing capacity.  We recently got a NetApp FAS iSCSI storage array and presented some storage to the file server.  

I would like to extend the existing data volume onto the new iSCSI storage, the benefit of doing this would be that I wouldn't have to move any data around and the existing volume would be given extra space.   I am after some advise on the benefits and drawbacks of having a data volume span accross internal drives and remote iSCSI drives. Thanks.
2 Solutions
Ken FayalCommented:
Just my two cents..  Doing this with RAID might be one thing, but extending the volume from a local drive onto a SAN disk might cause some latency issues that might make it not worth your while.  When I heard your idea, I got a chill down my spine.  When that happens I think trouble is ahead.
Paul SolovyovskyCommented:
Do not do this, it can cause may problems.

1.  Do not span on unlike storage, different latency can cause issues.
2.  You will not be able to use snapdrive
3.  You will not be able to use netapp snapshops
4.  You will not be able to use netapp dedupe

Do yourself a favor.  Run robocopy during the day for the initial copy.  disconnect network and do a robocopy with /MIR.  Reshare any shares and move the entire volume on the Neapp.  If it's a file server you'll get a good bit of dedupe.  If you have CIFS you can move the files onto the Netapp and make it act as a file server.
Gerald ConnollyCommented:
@carbonbase don't do it. It would be a short-term papering over the cracks remedy, that will give you lots and lots of problems!
carbonbaseAuthor Commented:
Thanks for all your comments, I thought this was a bad idea but just wanted to run it past you guys as a sanity check.

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