VMware ESXi 4.1 Change Datastore Block Size
The purpose is change VMFS-3 datastore block size from 1MB to 8MB ,because block sizes determine maximum file size1MB block size maximum file size =256GB
2MB block size maximum file size= 512GB
...
8MB block size approximate maximum file size =2TB. that's what i need !
start from ESXi5.0 ,1 MB block size maximum support 2TB..
Method:change the block size when recreate the datastore.
delete the target datastore in Client GUI ,then add it as new one.
Meet the error:
Call "HostDatastoreSystem.RemoveDatastore" for object "ha-datastoresystem" on ESXi "xxx"failed.
Possible cause :
there have background session lock or occupy datastore, files not fully cleard on datastore.
Solution:
1. ssh to management console with root
#esxcfg-scsidevs -l |grep -I naa
naa.6782bcb011d46500151104f30ababf04
Display Name: LocalDisk (naa.6782bcb011d46500151104f30ababf04)
Console Device: /vmfs/devices/disks/naa.6782bcb011d46500151104f30ababf04
Devfs Path: /vmfs/devices/disks/naa.6782bcb011d46500151104f30ababf04
naa.6782bcb011d465001511051c0d2df7a6
Display Name: LocalDisk (naa.6782bcb011d465001511051c0d2df7a6)
Console Device: /vmfs/devices/disks/naa.6782bcb011d465001511051c0d2df7a6
Devfs Path: /vmfs/devices/disks/naa.6782bcb011d465001511051c0d2df7a6
2. Use the fdisk command to create a new partition.
# fdisk /vmfs/devices/disks/naa.6782bcb011d46500151104f30ababf04
choose '1' and get the command actions menu; tyep ' m 'for help
[*] Type P to list partition information.
in this case , get 3 partition ,the last one need to be delete and recreate,
the other two is for FAT and VM diagnose
[*] Type d delete existing partition information....
[*] Type n for new partition.
[*] Select the desired partition and use P for a primary partition.
[*] For the cylinder prompt, press Enter for the default.
[*] Type t to change volume type to VMFS(fb)
[*] Type x to enter expert mode
[*] Type b to start the changing ...
[*] Type w to save and exit fdisk
To list the newly created partition information:
fdisk -lu /vmfs/devices/disks/naa.xxxxx
3. the vmkfstools command to format the new partition as a VMFS3 datastore, specifying a Block Size of 1-8MB.
vmkfstools -C vmfs3 -b BlockSize -S DatastoreVolumeName /vmfs/devices/disks/ DeviceName:Partition
example:
vmkfstools -C vmfs3 -b 8m -S NewDatastore /vmfs/devices/disks/naa.60901234567890123456789012345678:3
4. Rescan the storage system
refer VMware KB:http://kb.vmware.com/selfservice/microsites/search.do?cmd=displayKC&externalId=1009829
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