digitalex
Contributor
Contributor

VM added second disk (useable space issue)

Jump to solution

Any reason why when I add a secondary disk to a virtual machine and the actual disk is 299.5GB. It will only let me add it the VM as 254GB? It will not let me add it as 299, 290, or 280GB? I have another VM that has 110GB and it using 109GB of the 110 fine. The block size is 1mb.

My current setup for info: Virtual Center 2.1 ESX 3.5 up1 on 3x HP DL460c G1 16gb EVA4100_1 20 Windows 2003 Ent VM's
0 Kudos
1 Solution

Accepted Solutions
Dave_Mishchenko
Immortal
Immortal

When you use a block size of 1 MB the maximum size of a VMDK is limited to 256 GB. To add a VMDK file larger than 256 GB you would have to format the datastore with a block size of 2 MB (vmdk file up to 512 GB) / 4 MB (1024 GB) or 8 MB (2048 GB). You can't change the block size without a reformat.

View solution in original post

0 Kudos
3 Replies
Dave_Mishchenko
Immortal
Immortal

When you use a block size of 1 MB the maximum size of a VMDK is limited to 256 GB. To add a VMDK file larger than 256 GB you would have to format the datastore with a block size of 2 MB (vmdk file up to 512 GB) / 4 MB (1024 GB) or 8 MB (2048 GB). You can't change the block size without a reformat.

View solution in original post

0 Kudos
digitalex
Contributor
Contributor

You are right I missed the part where it said maximum disk size 256. Doh. Thanks.

My current setup for info: Virtual Center 2.1 ESX 3.5 up1 on 3x HP DL460c G1 16gb EVA4100_1 20 Windows 2003 Ent VM's
0 Kudos
Dave_Mishchenko
Immortal
Immortal

A warning message that explains things better would probably be helpful in cases like this. Going with 2 MB isn't going to be an issue, but you will want to leave some free space depending on what else you have on the LUN. For example, if you plan to use snapshops then you'll need to leave space for that , etc.

0 Kudos