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RAID configuration

Posted on 2013-06-09
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Last Modified: 2016-12-08
Hello,
We bought a server about a year ago, it has given nothing but trouble. The raid was configured badly , 4 disk array RAID 10. Now the I/O on the disks is slow and due to a lack or ram , they are constantly paging to the point the server will become not responsive and needs rebooted every 2 to 3 days. So to start with I am looking at putting in new 15,000 RPM disks rather than 7,200. I want to reload the OS on the new disks. Now for my question. I am not experienced with server os's so I want to number the current disks and set them aside. Remove the RAID controller and sit it aside. So if I cannot get the new disks loaded and configured, I can put the old parts back and boot the server for Monday business. Will the LSI raid controller hold the configuration if pulled and replaced as I described?
Thank you
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Question by:akersrus101
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by:Senthil Kumar
ID: 39232932
The RAID configurations are stored in the RAID controller only.so the new disks and controller will hold the new config only.
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by:dlethe
ID: 39232938
upgrading to 15K RPM drives won't fix the problem. You are starved for RAM (based on your symptoms).

If running windows, run perfmon (performance tools), or if running UNIX, look at top.
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Author Comment

by:akersrus101
ID: 39232973
my question is, if I remove the old Raid card and old drives then put them back in the same order they came out, will the system still boot? (will the raid controller hold it's configuration) The faster drives alone will not solve the problem , but memory and faster drives sure won't hurt.
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by:dlethe
ID: 39233002
It will complain, but yes, you can do that.

A smarter thing to do would be to use all 8 disks, and create another RAID10, and migrate data to split the load.
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by:andyalder
ID: 39233014
The disks hold the metadata for the configuration as well as the card. If you're removing both the disks and the card then when you put them back they won't even complain about the config changing. If you use the controller with te new disks though and then want to put the old ones back onto it you'll have to import the foreign config from the disks.
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akersrus101 earned 0 total points
ID: 39233144
Thank you for your input andyalder. Here is what I had in mind. Adding 16 more gigs of ram to the current 16 and max it out at 32. I have talked to a few other IT firms about my options. The current install of SBS 2011 had data migrated from a 2003 server. In the migration there was no clean up done to the 2003 server before everything was moved. So there a registry entries dating back 7 or 8 years that are out dated and to many to clean up correctly. This is the only server we have, it is a small company. I thought I would go in on the weekend, number and remove the old drives and RAID controller. Put in 4 of the new drives and controller and configure to a raid 5 or 10.  Partition the drives and attempt a reinstall of the OS. My knowledge of server setup and exchange is limited so if I don't make enough headway by Sunday, I can put in the old parts so the company can continue to run on the old hardware. We paid an IT company to build this thing. And it did not turn out well. Besides not having enough memory, the current set of drives are setup with one big partition. Well sorry about going on, it is just a mess. We have a limited budget to fix.
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by:akersrus101
ID: 39247006
My comment was in reply to the answer.
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