topic Re: Mirroring in Linux in Operating System - Linux

Mirroring in Linux

Lacrosse — Mon, 19 Apr 2004 10:04:25 GMT

Does RedHat have a software product that can do mirroring of the O/S like Mirror UX in HPUX....if not do I have to go to an external RAID and put the O/S out there??
Many thanks!

Re: Mirroring in Linux

Bill Thorsteinson — Mon, 19 Apr 2004 10:13:16 GMT

Linux does have mirroring support. This
is contained in an kernel module. Check
the Software-RAID HOWTO at http://en.tldp.org.

If you have installed the HOWTO package this
will be available locally.

Recent version of Linux include logical
volume management as well.

Re: Mirroring in Linux

Steven E. Protter — Mon, 19 Apr 2004 10:37:44 GMT

though lvm was ported mirror/ux was not.

you can easily software raid while setting up a new Linux system with the disk druid.

after the fact the document above should refer to a command that replaces the lvextend -m 1 command.

SEP

Re: Mirroring in Linux

Lacrosse — Mon, 19 Apr 2004 11:57:08 GMT

Cool thanks I am assuming this is something that comes with RedHat and I do not have to pay extra for????

Re: Mirroring in Linux

Mark Grant — Mon, 19 Apr 2004 15:37:17 GMT

Hookemhorns,

99.9% of all software from red hat and 100% of linux kernel features is free. It's just that some people choose to pay for it.

Re: Mirroring in Linux

Martin P.J. Zinser — Mon, 19 Apr 2004 16:00:47 GMT

Hi Mark,

even if you choose to pay, you do not pay for the Kernel or software. You do pay for somebody to put all the bits and pieces together in a compatible way, for testing that they are working together on a number of HW combinations (check the HCL), as well as some sort of support (exactly how much depends on the money you spent) as well as being able to distribute blame (seems important for many corporate customers ;-). And yes, depending on your environment I do see reasons why it is a good business decision to pay this money.

Greetings, Martin

Re: Mirroring in Linux

Roberto Polli — Tue, 20 Apr 2004 09:03:46 GMT

In my experience raid software destroys the performance of your machine, so if it's an overloaded, single cpu, machine think about a cheap HW raid controller.

Else you can easily set it up as suggested above a sw RAID.

Pax,R.