VHD Size is Maximum Size Allowed Without Using All Space in OS

hello - have hyper-v vm maximum size allowed 700gb. currently, vhd file size 700gb yet os using ~400gb (300gb free). shouldn't vhd size 400gb instead of 700? every other vm have checked matches size being used in os.

as typing think answered own question. vm has fixed size , of other vms have dynamic. assume why? sql server guess fixed better performance. didn't set up

can safely shrink vhd down little bit? when trying replicas of vm, keeps crashing vm due space limitations. on own cluster disk has few gb free why believe failing. how free disk space needed vhd located in order replication work?

this our sql server little cautious in it.

thanks help,

mike

hi mike ,

based on knowledge vhd , when delete file file not deleted on disk  thoroughly , give deleted tag (the "old space" not recycled until there no new space writing).

i think can not make smaller via shrinking .

maybe can try compress vhd file ( "edit disk..."  ), before doing please backup vm first .

 btw , recommended use fixed disk sql server .

best regards

elton ji

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