ESXi Datastore to Guest Machine

25 pts.
HP Proliant DL360 G6
VMware ESXi
I have Installed ESXi on HP DL 380 G6 with total 6 HDD. I have created first 2HDD using Raid1 ( total size of 138GB) and the rest 4HDD using Raid5 ( total size 800GB). After finishing of ESXi Installation, I can see both storage under ESXi's datastore. My issue is how do I present the whole 800GB disk to newly created guest machine ( Win2K8 R2) ? When I add like new disk to guest machine, it only allowed me to create 200+GB size virtual disk only. That will be great if any one can suggest me and guide me. Thx&Rgds, Bobo

Software/Hardware used:
ESXi with HP DL360 G6

Answer Wiki

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Hello Bobozin,

Well you might be hitting the limits “by design” of the default VMware configuration.
You need to check what is your store block size:

Configuration -> Storage -> Select the one you’re talking -> Look at “Details” the below pane “Block Size”.

By default, when data stores are created, their block size is 1 MB. This will only give you a virtual hard drive with a maximum of 256 GB. In order to get larger VHD’s, you need to delete data store(s) and recreate it/them keeping the following assumptions on how block size implicate maximum data store size:

Block Size Max. DS Size
1MB 256GB
2MB 512GB

Of course this assumes that by <b>deleting a data store you will loose everything you have in it.</b>. So, if you already have virtual machines running there you need to back them up first.
For this task a second ESX (i) would be useful to minimize downtime, or if you have a cluster with vMotion the task will be even easier with no downtime…


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  • Bobozin
    Hi Saturno, I didn't notice that option as used to set default parameter. I will delete the storage and test it again. Will update later once I've resolved!. Bobo
    25 pointsBadges:
  • Bobozin
    Hi Saturno, Thank you very much for your answer. Now I can manage to add the new HDD size more than 256GB. Appreciate you help! Bobo
    25 pointsBadges:
  • saturno
    You're welcome! Thank you for your feedback. It's always nice to hear it, good or bad. (so we can improve)
    4,585 pointsBadges:

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