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Nov 22, 2007 10:33:25 GMT
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Hello,
I've got one W2K3 server which use boot san. The LUN is stored on full
disk group. I'd like to use snapclone for bootsan and represent this
new volume to my W2K3 node.
What are the best practices for cloning data like OS ?
Can you say me, what are differences between snapshot and snapclone ? I
know that the snapclone is not available until the snap is finished...
I use EVA 5000 storageWorks with RSM for my tests.
Thank you
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Nov 23, 2007 08:33:33 GMT
Unassigned
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I would not recommend using snap clone for O/S installation on windows.
You'll find that you'll have problems with SID's especially if you're
using active directory.
I recommend you use HP RDP to deploy the servers. It's easy to setup and will quickly setup your entire server. |
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Nov 25, 2007 21:22:24 GMT
Unassigned
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Anthony,
The
difference between snapclone and snapshot on the EVA is that the
snapclone is a full copy of the vdisk. A snapshot is only the data that
has been changed with pointers back to the unchanged data.
To do
the data migration as you are suggesting will work very well with
snapclone. Also, snapclones are immediately available to the host. The
EVA will do the rest of the copy operation in the background. I have
done this many times and it works well every time.
Make a
snapclone of the system drive, shutdown the host. Unpresent the
original vdisk from the host, present the new one. Power server back on
and go into BIOS settings for the HBA. Ensure the correct boot lun
appears and then reboot the host. Your done! |
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Nov 26, 2007 02:51:07 GMT
N/A: Question Author
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I understand the snapclone mecanism. You says for snapshot, that only
the data modified are snap. The snapshot is like that "differential
backup" ?
i've
realized the same test of yours. But, I would like to know if the
snapclone can be make with the OS booted ? there is a risk with this os
cloned ? |
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Nov 26, 2007 17:57:24 GMT
Unassigned
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A snapshot can't be presented to another server, only a snap clone can.
Snapshot is good for situations such as if you're doing an upgrade and
want to easily roll back.
A snapclone creates a totally independant backup of the data.
As
i said before, if you do this, then the SID's that are generated on
installation will also be duplicated. I tried doing this last year and
had different sorts of problems left and right. I've also made "copies"
of virtual machine disk files to make another copy of a virtual machine
and we've had problems with this (it's basically exactly the same
thing).
If it's a production environment i STRONGLY recommend
that you DON'T do it. As previously mentioned, use HP's RDP product.
It's quite good and HP have developed all the scripts for you to setup
bios & Array cards, & installing O/S.
If you want to
clone other data then that's fine. I use snapclone every night to
perform a system backup of 35G of data in about 30 seconds.
Also, if a snapshot of a LUN exists, you can't snapclone it until you remove the snap shot.
I'm
sure that there is a good use for snapshot but i've never found a
useful one. I always use snapclone for making copies of data.
It will be particulary handy in cases such as making a copy of "production" data to present to a "development" environment.
I
did recently try and use snapclone for backing up windows servers by
cloning the data and presenting to another host to be backed up, but i
wasn't successful (without a lot of effort) in automating it as windows
didn't seem to like it. I believe it can be done, but backup over
network or direct to the SAN with a tape library is probably a MUCH
easier option, especially with the price of this hardware dropping. |
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Nov 27, 2007 09:32:07 GMT
Unassigned
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> A snapshot can't be presented to another server,
Ahem, that feature has been in the EVA since version 1. The ability to do a snapshot rollback is rather new. |
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Nov 28, 2007 06:31:37 GMT
N/A: Question Author
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In fact my operation will be to move the OS to another Disk group.
The server will be identical.
I''ve
no choice, I must do a snapclone for this operation. If I can do
without shutdown the server, i'll do. But, which state the os after
this changes... |
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