I'm going to try to post this on the 1st and 15th of each month, regardless
of whether or not I do any updates.
Greg
Linux-RAID FAQ
Gregory Leblanc
gleblanc (at) cu-portland.edu
Revision History
Revision v0.0.8 6 September 2000 Revised by: gml
The info/welcome message on vger.kernel.org has a pointer to this FAQ.
New section on recovery, and fixed a few markup things.
Revision v0.0.7 22 August 2000 Revised by: gml
vger isn't at rutgers anymore, so I'm making a few changes. Talked
with Dave (maintainer of vger) about getting something into the
welcome message, and/or footer of messages
This is a FAQ for the Linux-RAID mailing list, hosted on
vger.kernel.org. vger.rutgers.edu is gone, so don't bother looking for
it. It's intended as a supplement to the existing Linux-RAID HOWTO, to
cover questions that keep occurring on the mailing list. PLEASE read
this document before your post to the list.
_________________________________________________________________
1. [1]General
1.1. [2]Where can I find archives for the linux-raid mailing
list?
1.2. [3]Where can I find the latest version of this FAQ?
2. [4]Kernel
2.1. [5]I'm running [insert your linux distribution here]. Do I
need to patch my kernel to make RAID work?
2.2. [6]How can I tell if I need to patch my kernel?
2.3. [7]Where can I get the latest RAID patches for my kernel?
2.4. [8]How do I apply the patch to a kernel that I just
downloaded from ftp.kernel.org?
2.5. [9]What kind of drives can I use RAID with? Do only SCSI or
IDE drives work? Do I need different patches for
different kinds of drives?
3. [10]RAIDtools
3.1. [11]Why are the RAIDtools at
[12]http://people.redhat.com/mingo/raid-patches/ labeled
dangerous, and if they're dangerous, should I use them?
4. [13]Disk Failures and Recovery
4.1. [14]How can I tell if one of the disks in my RAID array has
failed?
4.2. [15]So my RAID set is missing a disk, what do I do now?
4.3. [16]dmesg shows "md: serializing resync, md4 has overlapping
physical units with md5". What does this mean?
1. General
1.1. Where can I find archives for the linux-raid mailing list?
My favorite archives are at
[17]http://www.geocrawler.com/lists/3/Linux/57/0/.
Other archives are available at
[18]http://marc.theaimsgroup.com/?l=linux-raid&r=1&w=2
Another archive site is
[19]http://www.mail-archive.com/[email protected]/
1.2. Where can I find the latest version of this FAQ?
The latest version of this FAQ will be available from the LDP website,
at [20]http://www.LinuxDoc.org/FAQ/. As soon as I get my server at
home fixed, I'll make it available there as well.
2. Kernel
2.1. I'm running [insert your linux distribution here]. Do I need to
patch my kernel to make RAID work?
Well, the short answer is, it depends. Distributions that are keeping
up to date have the RAID patches included in their kernels. The kernel
that RedHat distributes, as do some others. If you download a 2.2.x
kernel from ftp.kernel.org, then you will need to patch your kernel.
2.2. How can I tell if I need to patch my kernel?
The easiest way is to check what's in /proc/mdstat. Here's a sample
from a 2.2.x kernel, with the RAID patches applied.
[gleblanc@grego1 gleblanc]$ cat /proc/mdstat
Personalities : [linear] [raid0] [raid1] [raid5] [translucent]
read_ahead not set
unused devices: <none>
If the contents of /proc/mdstat looks like the above, then you don't
need to patch your kernel.
The "Personalities" line in your kernel may not look exactly like the
above, if you have RAID compiled as modules. Most distributions will
have RAID compiled as modules to save space on the boot diskett
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