VMware Datastore Size
A VMware datastore consists of 3 LUNs provide from SAN.
Datastore Size- 600 GB
LUN 1- 300 GB
LUN 2- 100 GB
LUN 3- 200 GB
Now if we unmount and remove the LUN 3 (200 GB) what will happen?
1. Will there be any problem with the VMs that are already running on the datastore?
2. Will the datastore size be automatically reduce to 400 GB?
3. Is there any recommendation to safely unallocated or unmount the LUN?
Datastore Size- 600 GB
LUN 1- 300 GB
LUN 2- 100 GB
LUN 3- 200 GB
Now if we unmount and remove the LUN 3 (200 GB) what will happen?
1. Will there be any problem with the VMs that are already running on the datastore?
2. Will the datastore size be automatically reduce to 400 GB?
3. Is there any recommendation to safely unallocated or unmount the LUN?
SOLUTION
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@Andrew I think cbinayak create a datastore with multiple vmfs extents
If this is the case (generally a bad idea)
remove first lun will destroy the datastore,
remove other lun will impact all vmachine that have at least one block on the lun
Check the link for reference:
https://blogs.vmware.com/vsphere/2012/02/vmfs-extents-are-they-bad-or-simply-misunderstood.html
If this is the case (generally a bad idea)
remove first lun will destroy the datastore,
remove other lun will impact all vmachine that have at least one block on the lun
Check the link for reference:
https://blogs.vmware.com/vsphere/2012/02/vmfs-extents-are-they-bad-or-simply-misunderstood.html
Well if you've created a datastore using extents, this is very bad! not recommended!
if you remove a LUN it will all blow-up in your face, and the VMs will all go offline, and the datastore corrupted!
Start again!
if you remove a LUN it will all blow-up in your face, and the VMs will all go offline, and the datastore corrupted!
Start again!
ASKER
Thank you for your valuable suggestions. However, I am confused about the statement you mentioned- "Well if you've created a datastore using extents, this is very bad! not recommended!"
If I need to extend an existing datastore of 2TB size to 8TB, is it not advisable to extend that datastore by assgining another 3 LUNs of 2 TB each?
If I need to extend an existing datastore of 2TB size to 8TB, is it not advisable to extend that datastore by assgining another 3 LUNs of 2 TB each?
ASKER CERTIFIED SOLUTION
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Not really, as if you lose one LUN then the whole datastore is lost
You will have one datastore less!
1. You will not be able to delete or unmount it, if it's in USE!
2. No.
3. Yes, you should mask it first!
https://blogs.vmware.com/vsphere/2011/11/best-practice-how-to-correctly-remove-a-lun-from-an-esx-host.html
https://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2004605