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Managing snapshots and saving space

Posted on 2015-01-15
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Last Modified: 2015-01-22
hi,
I am running out of space and decided to delete the old snapshots but my drive stays at the same capacity after I deleted snapshots using Snapshot manager. Please advise.

Also, what is the size difference between snapshot image and clones? What are the disadvantages of the snapshots vs doing clones?

Thank you.
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Question by:creative555
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Andrew Hancock (VMware vExpert / EE MVE^2) earned 2000 total points
ID: 40551341
Are you sure, the snapshots have gone?

Please upload a screenshot?

1. Snapshots will keep increasing in size. (they are not designed to be permanent, no longer than two days max!)

2. Performance is affected when a VM is writing to a snapshot.

3. Snapshots are NOT backups.

4. CLONES are fixed size (e.g. a backup!)

see my EE Article

HOW TO: VMware Snapshots :- Be Patient

see this queston

VMWare Snapshot Performance Hit?

Where I wrote this:-

To be expected I'm afraid, one good reasons why I recommend *NOT* using Snapshots! and the biggest issue is to come, because your VM is running slowly, updates will take forever to process, and when you have decided the updates have worked, the snapshot size can be as large as 1GB per hour, running, that when you come to DELETE ALL the snapshot, the merge can also take many hours to compele!

Whilst a VM writes to a snapshot disk (child) performance will always be bad, no matter what underlying datastore you have! (I've never found it depends, and I've used the fastest datastores in the world, and snapshots still have a huge performance hit! and a single SATA 7,200rpm disk....wow, that's going to be slow! - I think you've only got 40 IOPS there, if the I/O was not virtualised!)

You will also find that Veeam will not support your environment, and it would be too slow for Veeam Backup and Replication, (which uses the Storage API - snapshots) to backup the VMs, and all storage vendors use the same routines and snapshots!

If you search on all my responses to Snapshot Questions, in the last 4-5 years, I've said the same, snapshots are evil, rubbish, do not use them, they cause more issues than they cure!

See my EE Article

HOW TO: VMware Snapshots :- Be Patient

SOLUTION

Do not use them! and rather than use a snapshot, take a FULL CLONE as a backup before you start running updates or use a third party vendor backup tool.

If the updates go wrong, destroy the current machine, rename the CLONE (in the inventory), and restart it - done!

If the updated VM is successful - delete the CLONE.

SAFER, Faster than Evil Snapshots!
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Author Closing Comment

by:creative555
ID: 40565557
THank you
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