On Fri, June 4, 2004 13:13, Neil Brown said:
> On Friday June 4, robin@xxxxxxxxxxxxxx wrote:
>> Where can I read more about this?
>
> Uhm.... Good question. The are brief hints in
> man mdadm
> and
> man mdadm.conf
> but I guess I should put something in:
> man 4 md
Ok, I've d/l and built the man pages for mdadm. I can't access my linux box at the
moment so I've done this on my WinXP laptop under cygwin. mdadm wouldn't build under
cygwin so I just built and installed the manpages. Here's a patch for the Makefile to
allow the manpages to be built/installed separately with "make man" and "make
install.man":
*** Makefile Fri Jun 4 07:18:28 2004
--- Makefile.man Fri Jun 4 15:11:27 2004
***************
*** 60,63 ****
--- 60,64 ----
all : mdadm mdadm.man md.man mdadm.conf.man
+ man : mdadm.man md.man mdadm.conf.man
everything: all mdadm.static mdadm.tcc mdadm.uclibc
***************
*** 106,109 ****
--- 107,115 ----
$(INSTALL) -D -m 644 mdadm.conf.5 $(DESTDIR)$(MAN5DIR)/mdadm.conf.5
+ install.man : mdadm.8 md.4 mdadm.conf.5
+ $(INSTALL) -D -m 644 mdadm.8 $(DESTDIR)$(MAN8DIR)/mdadm.8
+ $(INSTALL) -D -m 644 md.4 $(DESTDIR)$(MAN4DIR)/md.4
+ $(INSTALL) -D -m 644 mdadm.conf.5 $(DESTDIR)$(MAN5DIR)/mdadm.conf.5
+
clean :
rm -f mdadm $(OBJS) core *.man mdadm.tcc mdadm.uclibc mdadm.static *.orig
*.porig *.rej *.alt
Also I noticed a typo in the mdadm man page:
CREATE MODE
Usage: mdadm --create device --chunk=X --level=Y
--raid-devices=Z devices
This usage will initialise a new md array, associate some devices with
it, and activate the array.
This the --auto option is given (as described in more detail in the ...
The second "This" should be "If" (I'm soooo anal sometimes!)
Anyway, back to the subject in hand...
I have a linux box into which I shall be installed 6 x 250GB SATA drives on a couple of
Promise controllers (3 per controller). I guess these will be named
/dev/sd{a,b,c,d,e,f}.
I then intend to create a couple of mirrored partitions, one to boot from and one for
swap, plus a large RAID5 array with several partitions for /usr,/home, /data, etc.
So, would I do something like:
# cfdisk /dev/sd{a,b,c,d,e,f}
(On each disk create one small partition for the RAID1 array + swap, plus one large
partition for the RAID5)
# grep mdp < /proc/devices
(Get the major numbers of the md devices - will I have more than one, eg XX1, XX2?)
# mdadm --create /dev/md/XX1 --auto=partition2 --level=1 --raid-devices=6 /dev/sd[abcdef]1
(create a RAID1 array from all six drives containing two partitions )
# mdadm --create /dev/md/XX2 --auto=partition6 --level=5 --raid-devices=6 /dev/sd[abcdef]2
(create a RAID5 array from all six drives containing 6 partitions)
# cfdisk /dev/md/XX1
(create /boot and swap partitions)
# cfdisk /dev/md/XX2
(create partitions on RAID5 array)
One issue:
- Would it be better to create the mirrored arrays as separate, "standard" md arrays of
three drives (2 plus spare). Would I do this by 1) creating the necessary partitions,
2) building the array like this:
# mdadm --create /dev/md0 --level=1 --raid-devices=2 /dev/sd[ad]1 --spare-devices=1
/dev/sdb1
# mdadm --create /dev/md1 --level=1 --raid-devices=2 /dev/sd[cf]1 --spare-devices=1
/dev/sde1
Am I somewhere near the mark?
Cheers,
R.
--
http://robinbowes.com
-
To unsubscribe from this list: send the line "unsubscribe linux-raid" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
