I could be completely over thinking the entire situation, but to me it seems that has to be some sort of correlation between the three different "layers" as I call, and a best practice to suit. >The effect is minimal on performance but does exist. What effect does that have on the OS/Virtual HD's and their respective block sizes installed on top of the stripe element and VMFS block size? >As long as it's 1024KB or smaller in 4KB chucks it does not matter really. If the RAID Strip element size is set to 1024KB so it matches the VMFS 1MB Block size, would that be best practice or is it indifferent? Really the gains from 64K are lost a little when the backend storage is 1MB. >The problem here is VMFS is going to go with 1MB no matter what you do so carving it lower on the RAID will not cause issues but will not help them either. * Con sider that this data store would eventually store several virtual hard drives for OS, SQL Database, SQL Logs each formatted in NTFS at the recommended block size,4K,8K,64K. Would you use 1024KB to make it match the VMFS block size that will eventually be formatted on top of it? >I would go with 1024KB to match VMFS 5 size What block size would you use on Array 2 which will be used as the VM Datastore in ESXi? >If you have two arrays I would set the block size on the hypervisor array to 8KB What block size would you use on Array 1 which is where the actual hyper-visor will be installed? Virtual Drive 2 - 990GB - Used for VMFS Datastore/VM Storage Virtual Drive 1 - 10GB - To be used for Hyper-visor OS files I have 1 TB of space (round about) and create two Virutal Drives. Partition Alignment and block size VMware 5 | I wrote a blog post about this whole thing that I hope will help: Do matching block sizes across layers increase performance or is it a best practice? Any help answering and/or explaining best practice is greatly appreciated. If a SAN were involved instead of a Hardware RAID controller on the host, would it be best to store the OS vmdk on the VMFS5 datastore and create a separate iSCSI LUN formatted at a 64K block size then attach it using the iSCSI initiator in the OS and format that at 64K. Would it be best if all or some of the block sizes matched on different layers, and why or why not? How do the different block sizes affect other layers and performance? Could you suggest better alternative or best practice for the above example configuration? It seems VMFS5 is limited to only having a 1MB block size. -900GB Virtual HD configured using NTFS 64K block size to store SQL database.-100GB Virtual HD using NTFS 4K block size for OS.-1TB from Raid Controller formatted with VMFS5 1MB block size.-1TB Volume configured at 4K block size.(Layer1) Hardware: Hardware RAID Controller Here is my example of what I am referring to as a layer: If user is trying to access access exchange online using native app (that comes with windows 10 by default or desktop clients) from windows or mac device for emails ,they will straight away hit following error message which is coming from conditional access.The example below is not an actual configuration I am working with, but should get the point across. Ĭlick on access controls ,Grant ,Choose Block to deny access to exchange online if users connect from desktop clients using windows and mac (as per the above setting)Ĭlick on Enable policy to save the changes and enable the policy On the client apps ,choose mobile apps and desktop clients (since we have chosen only windows and mac, this will apply to desktop clients and no mobile apps). On the conditions ,select device platforms ,choose windows and macOS (preview) ,client done On the cloud apps, select the apps (in this case, office 365 exchange online) ,client done Give the policy Name ,on the assignments ,click users and groups ,choose select users and groups ,on the right side ,you can choose users or groups or you can choose all users ,click Done To start with ,go to ,click on Intune on the right side, click on Conditional access. To block access to o365 exchange online (not for exchange on-prem) from windows and mac devices using mobile apps and desktop apps like outlook or other apps ,we need to create condition access policy with assignments and access controls. More information about conditional access read from Technet Ĭonditional access allow access to company data only for authenticated users from compliant devices (If you apply conditional access to list of users ,device must enroll before they check for device compliance) from approved apps under the right conditions. In this blog post, we will see how to use conditional access to deny/block access to Office 365 Exchange Online (emails) from windows devices and mac devices.
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