vmware vmotion

I will be migrating our mailserver to another vmware host tonight so I can reboot the host. I've used vmotion before and it worked great and there was no downtime at all, but that was usually with non essential servers.
With the server I will be migrating tonight it has a large datastore, but this doesnt matter does it since it's not transferring data?
It should only take a minute to migrate over with no downtime, correct?
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tolinromeAsked:
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Correct, vMotion just creates a snapshot, moves the running memory component to the new host, and then commits the snapshot.

You can experience, a few pings lots when using vMotion.

With an Exchange Server, I would vMotion at a "quiet time" if possible, but you'll not experience any downtime, but some clients could detect, and may require re-connecting.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
The virtual machine disks, do not move, they stay put on your shared storage.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
a few pings lost when using vMotion - this is normal.
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Danny McDanielClinical Systems AnalystCommented:
I thought there was only a snapshot if you were doing a storage v-motion???  with regular vmotion, you are just moving the contents of memory from one host to the other, then doing a freeze/stun of the VM while the process is brought up on the new host and killed on the old one.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
@danm66: Well I use the term snapshot, not in the sense of the conventional VMware snapshot, lets call it a "memory-snapshot."

but ALL the contents of memory are saved to the datastore, so if you have a large VM, 16-32GB memory a 32GB VSWAP file is saved to datastore on one host, and then read back on the other host.

depending upon, how active the VM, Host CPUs, datastore speed, this can cause a glitch on large production VMs.

Most of our Large Clients (with many thousands of users), because in the past it's caused the helpdesk to light out like a Christmas Tree, vMotion is under Change Control for some Services, and must be done out of hours, and scheduled. (which has been fun for DRS!), which causes non end of interesting discussions, and emergency changes!

anyway, I'm sure you'll understand!
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tolinromeAuthor Commented:
we have about 160 mailboxes on it.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Schedule for a quiet time, e.g. not 9am in the morning!

You may not even notice, but just giving you the heads up, just in case the Service Delivery Manager starts breathing down your neck!

I would recommend out of core hours, I know with Exchange 24/7, users connected to mailboxes, we usually complete maintenance Windows at 11pm.
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tolinromeAuthor Commented:
hahah yeah I know, the downside of being in IT is that you have to do everything late at night and on weekends, even weekend days used to be a good time for "downtime" - those days are gone now and it has to be a weekend night - being that everyone is so connected now...
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
We don't mind it we cover 24/7/365 monitoring and managing clients and datacentre!
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tolinromeAuthor Commented:
when I went to reboot the host it asked me if I wanted ot go into maintenance mode, should I?
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Yes, its good practice.
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