snapshot

Офигенная дока про снапшоты: Troubleshooting Virtual Machine snapshot problems.
Все все все про снапшоты.
Содержание:

   1. Virtual Machine snapshots
          * 1.1. Understanding Snapshots
          * 1.2. Using the Snapshot Manager
          * 1.3. Snapshots configuration files
                o 1.3.1. The .vmsd and .vmsn files
                o 1.3.2. The .vmdk and -delta.vmdk files
                o 1.3.3. The .vmx file
   2. Troubleshooting snapshots
          * 2.1. Calculating the number of snapshots
          * 2.2. How much space is needed to commit the snapshots of a virtual disk?
          * 2.3. Committing snapshots when there are no snapshot entries in the snapshot manager
          * 2.4. Troubleshooting a failed 'removesnapshots' operation
                o 2.4.1. Corrupt snapshot(s) on the chain
                o 2.4.2. Broken CID chain
                o 2.4.3. vmkfstools -q
                o 2.4.4. Hostd behaving abnormally
                o 2.4.5. Check KB
          * 2.5. Other options
                o 2.5.1. Clone the VM
                o 2.5.2. Clone virtual disks
                o 2.5.3. Commit one virtual disk at a time
                o 2.5.4. Commit manually to the base disk
                o 2.5.5. Other options
          * 2.6. How can we free up space on the Datastore?
          * 2.7. General important considerations
                o 2.7.1. Extra considerations
   3. Related KBs
          * 3.1. Public
          * 3.2. Patches
   4. Preventing issues with snapshots
   5. Knowledge gained from experience
   6. Frequently asked questions
          * 6.1. How long is it going to take to delete all the snapshots?
          * 6.2. How do I know when the 'removesnapshots' operation is completed?
          * 6.3. How do I know that the 'removesnapshots' operation is really working?
   7. Useful commands
   8. References

Порадовала толковая анимированная гифка про удаление\слияние снапшотов:

К слову полезно знать:
* Do not allow the Service Console to swap. This is the root of many issues.

You may wonder, How do I know if the Service Console is swapping?
Run the command "free -m"

# free -m
                          total    used   free    shared     buffers    cached
Mem:                  291     229     62         0            36           136
-/+ buffers/cache:           56     235
Swap:                  596    XX     535

The number on XX is the amount of Megabytes that the Service Console is using or has used from the swap space. It should be zero.