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increase disk space on VMWare virtual machine

I am trying to increase the virtual hard drive space on a VMWare VM, on an ESX 3.5 server.  When I go to increase it hot, I get  "a general system error occurred: internal error."  If I power the machine off and try to increase the disk space, it just doesn't take, no error message.  
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coolsport00
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You can't do it hot; after you pwr off th VM & make the change, you then need to finalize the change with a 3rd party tool (Gparted or Paragon) or diskpart if its not a system volume.

~coolsport00
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yes you can do it hot, and you can extend it through disk manager in 2008.  Should have mentioned i'm using 2008.  However, I cannot even get VMWare to add the disk space hot or cold.  
Ah yes..2k8, 2k7, & Vista :)

Is your disk showing as IDE or LSI Logic in the VMs Edit Settings area?
LSI Logic.
So, is the option to change the virtual disk size greyed out on the VM when you power it down?
no it is not greyed out, it lets me change the size, but when I click OK, it says it completed it, but the disk size remains the same.
Ah...ok; that's because you're not done :)  What you need to then do when you power back on is go into Disk Mgmt and 'expand' the size. That should then increase it.

~coolsport00
are you talking about disk management in windows?  If so I did that, it doesn't see the new space.  
Yes, that's what I meant. Hmm...ok. Well, do you have snapshots?
i do have snapshots.
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coolsport00
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Thank you!  :-)
You're welcome; sorry I didn't suggest that earlier...one of the 1st things I normally ask. Slipped my mind. Old age is getting the best of me it seems... :)

~coolsport00