exchange 2010

I have showing in 1  mailbox database in DAG  database size : 1gb       disk space free :76.9%

what does that mean+ what is difference between disk spacesize vs whitespace size?

secondly I am doing patching o my DAG servers , are the below commands correct"? (step wise)

Need to check the what all database mounted in mailbox server.
get-mailboxdatabase –server “mailboxname”

Then need to check the database status. Mounted & healthy.

Then need to check DAG so that which all servers under which DAG.

After getting the DAG info need to move the DBs from restarting server to other server in same DAG.
move-activemailboxdatabase dbNAME -activeonserver destinastionservername

After moving we need check the DB status & then suspend them from restarting server.
suspend mailboxdatabasecopy "DBname"

Once we suspend Need to restart the server.

After restart we need to resume all the database on that server
resume-mailboxdatabasecopy DBname

Then check the DB status.

They should be Healthy in status.

are the above steps correct, any issues I should be aware of?
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Tim EdwardsIT Team Lead - Unified Communications & CollaborationCommented:
The size showing in the disk manager and in the exchange management is the currently consumed space at one point, it will grow but not reduce unless you defrag. You can run a powershell script in the ems to show you the whitespace that will be written to be it start consuming your space on the volume you again.

This is the a great article that I follow to patch the dag environment:

Short Form under assumption that all servers are multi-role:

1. Verify health and database mount point
2. Move database over to server that is not being patched
3. Confirm database are mounted correctly and healthy
4. Run StartDagMaintenance on the server that you want to patch
5. Do your maintenance
6. When completed and all services are back up and running (you verify)
7. Run StopDagMaintenance
8. Move the database over and check health
9. Repeat the process
Ajit SinghCommented:
How to Solve Disk space issues on Your Exchange Server: 

The Puzzling Mathematics of White Space in Exchange Database:

The following permissions will be required.

Windows Patching: Local Administrator
Exchange Patching: The following group membership will be required:

Local Administrator
Schema Admins
Enterprise Admins
Domain Admins
Organization management.

How to perform patching for Exchange 2010 in DAG Environment

Using PowerShell to Get Mailbox Database Size and Available New Mailbox Space:

Hope this helps!

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