Archive for November, 2011
When upgrading to vSphere 5.0, it is possible to simply upgrade datastores to VMFS5 without any downtime. It is an online and non-disruptive upgrade operation. However, there are some negatives to upgrading the datastores instead of deleting and re-creating, such as:
- VMFS-5 upgraded from VMFS-3 continues to use the previous file block size which may be larger than the unified 1MB file block size.
- VMFS-5 upgraded from VMFS-3 continues to use 64KB sub-blocks and not new 8K sub-blocks.
- VMFS-5 upgraded from VMFS-3 continues to have a file limit of 30720 rather than new file limit of > 100000 for newly created VMFS-5.
- VMFS-5 upgraded from VMFS-3 continues to use MBR (Master Boot Record) partition type; when the VMFS-5 volume is grown above 2TB, it automatically & seamlessly switches from MBR to GPT (GUID Partition Table) with no impact to the running VMs.
- VMFS-5 upgraded from VMFS-3 continue to have its partition starting on sector 128; newly created VMFS5 partitions will have their partition starting at sector 2048.
|From||To||Duration in minutes|
|FC datastore 1MB blocksize||FATA datastore 4MB blocksize||08:01|
|FATA datastore 4MB blocksize||FC datastore 1MB blocksize||12:49|
|FC datastore 4MB blocksize||FATA datastore 4MB blocksize||02:36|
|FATA datastore 4MB blocksize||FC datastore 4MB blocksize||02:24|