Kam Salisbury on Wed, 26 Feb 2003 12:08:15 -0500


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Re: [PLUG] organizing files on software Raid (SCSI)


You can boot from a software RAID1 mirror, not a software RAID0 or 5. The
only partition that must be RAID1 is /boot, others including root can be on
RAID5 or 0. I use Redhat 8 as well and it works great in this configuration,
though I am not sure when I would use a RADI0 partition -- maybe for /tmp...

Kam Salisbury
MCSE, Linux+, CNA
http://kamsalisbury.com
http://pwig.org

----- Original Message -----
From: "Wayne Dawson" <jongalt@pinn.net>
To: <Plug@lists.phillylinux.org>
Sent: Wednesday, February 26, 2003 2:03 PM
Subject: [PLUG] organizing files on software Raid (SCSI)


> Hello, I am trying to set up a computer to use software RAID, and put as
> much as I can on the RAID.  I have seen some indications that I can't boot
> from a software RAID (although other places I have seen contrary
information).
>
> Here's the result of df:
> Filesystem           1K-blocks      Used Available Use% Mounted on
> /dev/hda5               505605    179305    300196  38% /
> /dev/hda1               101089     17580     78290  19% /boot
> /dev/hda3              7337124     32876   6931540   1% /home
> none                    127176         0    127176   0% /dev/shm
> /dev/hda2             20050176   3972764  15058892  21% /usr
> /dev/hda6              1027768    168644    806916  18% /var
> /dev/md0              17639128     32836  16710276   1% /mnt/softraid
>
> (By the way, I haven't figured out how to put the RAID into /etc/fstab,
but
> I suspect it won't normally be mounted as /mnt/softraid anyway.)
>
> I don't know what /dev/shm is (is it related to this?), but I created
> /dev/md0 from /dev/sda1 and /dev/sdb1, using mdadm -C.  The SCSI hard
disks
> are in a cabinet separate from the computer, but /dev/hda is a plain old
> IDE drive in the computer.
>
> I'm using Red Hat 8.
>
> Here's the result of lsmod (apparently whether SCSI and/or RAID software
is
> compiled into the kernel is relevant to booting from a SCSI RAID):
> Module                  Size  Used by    Not tainted
> vfat                   13084   0  (autoclean)
> fat                    38712   0  (autoclean) [vfat]
> raid1                  15276   1  (autoclean)
> ide-cd                 33608   0  (autoclean)
> cdrom                  33696   0  (autoclean) [ide-cd]
> emu10k1                68744   0  (autoclean)
> ac97_codec             13384   0  (autoclean) [emu10k1]
> sound                  74388   0  (autoclean) [emu10k1]
> soundcore               6532   7  (autoclean) [emu10k1 sound]
> i810                   72736   1
> agpgart                43072   7  (autoclean)
> binfmt_misc             7524   1
> autofs                 13348   0  (autoclean) (unused)
> 3c59x                  30640   1
> iptable_filter          2412   0  (autoclean) (unused)
> ip_tables              14936   1  [iptable_filter]
> microcode               4668   0  (autoclean)
> mousedev                5524   1
> keybdev                 2976   0  (unused)
> hid                    22244   0  (unused)
> input                   5888   0  [mousedev keybdev hid]
> usb-uhci               26188   0  (unused)
> usbcore                77024   1  [hid usb-uhci]
> ext3                   70368   6
> jbd                    52212   6  [ext3]
> aic79xx               212516   2
> sd_mod                 13552   4
> scsi_mod              107144   2  [aic79xx sd_mod]
>
> So here's my question:  what's the best way to *expediently* maximize how
> much of my data can be stored on the RAID?  (ie. How should I organize
> everything?  Can I arrange to boot from RAID with, for example, nothing
but
> GRUB on the IDE drive?  Or even without anything on the IDE drive?  I
guess
> that would involve recompiling the kernel.)
>
> Anyway, thanks for any assistance,
> Wayne
>
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