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Mirror Image Hard Drive

Posted on 1998-11-24
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Last Modified: 2010-04-20
I would like to be able to mirror my server hard drive.

I would like to keep it in one system but can be put into two systems if works easier.

I'm looking for the software to do this.

Does anyone have the software or other ways to do this with detailed instruction to set this up.

Thanks
Bob Ross
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Question by:bross073097
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Expert Comment

by:harrys
ID: 1638579
Take a look a the MD device driver documentation (under /usr/src/linux/Documentation).

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Author Comment

by:bross073097
ID: 1638580
I can't find this one. There is no MD in the directory. I have Linux 2.0.33 and I also looked in the 2.0.0 location.

Thanks
Bob Ross



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Expert Comment

by:harrys
ID: 1638581
to be more specific
CONFIG_BLK_DEV_MD
  This driver lets you combine several harddisk partitions into one
  logical block device. Information about how and why to use it and the
  necessary tools are available over ftp (user: anonymous) from
  sweet-smoke.ufr-info-p7.ibp.fr/pub/public/Linux in the md package
  and the md-FAQ. Please read drivers/block/README.md. If unsure, say
  N.
     
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Author Comment

by:bross073097
ID: 1638582
I get an unknown host.

sweet-smoke.ufr-info-p7.ibp.fr

Is there a web site ?I can find this. I need detailed help to see if I can get a mirror routine working.

Thanks
Bob

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Expert Comment

by:overcode
ID: 1638583
I have found that Promise's FastTrak RAID controllers offer a cost-effective solution for disk mirroring. They are blazingly fast and only cost $150 or so. I suspect they work with Linux (they're quite popular, and besides I think they work at the hardware level, not at the BIOS level), though I have not verified this.
As someone else said, the MD driver provides a software-based solution to this problem. It's not quite as fast as the FastTrak's dedicated controller card but it's simple and free.

-Reeves
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Author Comment

by:bross073097
ID: 1638584
Now two of you talked about MD, is there a web site, I tried to ftp from it and get an unknown host with the above address.

Thanks
Bob Ross

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Expert Comment

by:harrys
ID: 1638585
dont get me wrong, you just need some tools which might be a part of your distribution, the md driver itself is in the kernel, you just need to turn it on. It is more than just mirroring it could also do stripping and raid level 5. Your might take a look at www.linux.org in the md how-to (or mini-howto I dont remember..)...
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Author Comment

by:bross073097
ID: 1638586
This is starting to be a real trouble. I went to the Linux site and there is nothing on md how-to when I do a search. Would it be known as something else.

Thanks
Bob Ross

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Expert Comment

by:rayman
ID: 1638587
Please refer to LINUX mini-howto on topic of RAID. You need to recompile the kernel to allow software RAID function (include mirror, stripping)to be activated. To enable RAID function, please goto "/usr/src/linux" and "run make config" to activate the RAID function. If there is no RAID option, please get the latest version of kernel(v2.1 or later).

There are also some DOS program like "GHOST" from Norton which can make a copy of linux partition to other HD even HD have different size. To to do, you need a dos boot disk with GHOST s/w and two HDD installed. Boot up the dos and run GHOST to make a copy of your linux boot disk.
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Author Comment

by:bross073097
ID: 1638588
I run 2.0.33 Slackware, the latest of that is 2.0.35 there is no RAID selection in 33, I will have 35 in a few weeks.

Thanks
Bob Ross

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Author Comment

by:bross073097
ID: 1638589
Since there was three of you how do I split the points so this can be closed out.

Thanks
Bob Ross

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Author Comment

by:bross073097
ID: 1638590
Does any one have something that has a detailed setup to get this working.

Thanks
0
 

Author Comment

by:bross073097
ID: 1638591
I tried FastTrack and any mail to this site is bounced. Seems that they are not doing business any longer.
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Expert Comment

by:benten
ID: 1638592
harrys is right.  To get software mirroring in the kernel to work you need two things.  A compiled kernel that has MD support and the raidtools to configure the MD devices.

Checkout the kernel documentation as harrys mentioned in his/her first comment.  You might need to get the lastest kernel.  It can be obtained from ftp.kernel.org.  The experimental 2.1.x kernels are not necessary for MD support.

I have the raidtools installed as a package a RedHat 5.2 system but I do not know where the sources come from.  I will have to check the SRPM spec file.
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Expert Comment

by:benten
ID: 1638593
If you are interested in a hardware solution as overcode suggests then there are many vendors to choose from.  I know AMI and Mylex/BusLogic have had long standing products in these areas.
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Accepted Solution

by:
eugenia020899 earned 200 total points
ID: 1638594
If you want to have two copies of the disk in the same machine you can use software RAID (included in the kernel)... if you want to do a network backup I suggest Amanda (http://www.cs.umd.edu/projects/amanda) which allows you to do backups via the net to a tape streamer or to an hard disk.
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Expert Comment

by:benten
ID: 1638595
eugenia: That suggestion is hardly novel.  Just about every comment in this thread is about RAID.

I suppose the tape backup information is new but I doubt that constitutes much of an answer.
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