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RAID 1 in window 2000 server

Posted on 2003-03-18
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Can Win2k OS be mirrored with RAID 1 ? Some said I can only mirror the data partiton, not the OS partition, in which means there will be a problem to cause the data and OS lost and server won't be bootup from mirrored(second) drive, if both OS and data in the same partition.

Please advise.
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Question by:joehuang
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by:MSGeek
ID: 8159641
Sure on a hardware mirror, it is common for the OS to be mirrored.  It doesn't know it's mirrored, but it is.

The statement would be correct if you are referring to Dynamic Disk Mirroring.  

If you have a data drive mirrored using dynamic disk and you for some reason have a critical failure of the OS and have to reinstall, your data should still be there.  This is howvever a very good argument for good backups.
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by:joehuang
ID: 8161058
1. Do you mean the hardware mirror work on either basic disk or dynamic disk ?

2. Can I mirror the OS, if I use the basic disk ?

Thanks,
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by:MSGeek
ID: 8161134
A hardware RAID implementation is strictly hardware based.  The OS doees not even know it is installed on a RAID array.  So baisc or dynamic disk in hardware RAID it does not matter.  Generally I would recommend against placing your system partition on a dynamic disk.

You can mirror the OS on a basic disk ONLY if you implement RAID through hardware, not through software.
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by:joehuang
ID: 8161513
Can you tell why you don't recommend to mirror OS/system partition with dynamic disk ?
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MSGeek earned 80 total points
ID: 8162351
While it can be done, I am a believer in Hardware based RAID implementations.  You are not relying on the OS to maintain the mirror.  The following KBs mat shed some light on why I don't like to mirror the system partition.  It can be done, but again it's not like a hardware based mirror with hot swapable drives.  When a drive fails you just put in a replacement at the mirror is rebuilt.

http://support.microsoft.com/default.aspx?scid=kb;en-us;229077
http://support.microsoft.com/default.aspx?scid=kb;en-us;167045
http://support.microsoft.com/default.aspx?scid=kb;en-us;113977
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by:MSGeek
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Thanks, MSGeek.
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