Software RAID question

I'm trying to mirror my two disks in my system (F12 x86_64)...
I have the following disk partitions
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/md127 7692840 508960 6793104 7% /
tmpfs 1016196 260 1015936 1% /dev/shm
/dev/md1 380760 44094 316993 13% /boot
/dev/sda6 7684844 3956688 3337780 55% /usr
/dev/md5 7692776 418204 6883800 6% /var
/dev/md7 934037448 388908936 497682148 44% /home
I am trying to get /dev/sda6 and /dev/sdb6 to become a RAID-1 volume...
I have created /dev/md6 as a degraded array and copied everything from
/dev/sda6 to /dev/md6 in single user mode (actually booted from the
recovery CD) and after mounting both partitions ran "find . -depth |
cpio --passthrough --reset-access-time --make-directories
--preserve-modification-time /mnt2" (/dev/md6 was mounted on /mnt2).
The copy took a few minutes and completed successfully.
I then modified my /etc/fstab to read (only showing physical disks) (I
commented the old UUID and added the new UUID)
UUID=abcf3490-11d2-4641-bf47-c33d1614066d / ext4 defaults 1 1
UUID=e28d03fe-50ec-4313-a281-f1abecd4ed10 /boot ext4 defaults 1 2
# following is /dev/sda6
#UUID=3b891301-1b89-447b-81e3-4ddc5c835b3f /usr ext4 defaults 1 2
# following is /dev/md6
UUID=e0eb5abe-1765-48f7-923f-da8295b54313 /usr ext4 defaults 1 2
UUID=e35b19c3-b303-49fc-87d4-0712ac3de571 /var ext4 defaults 1 2
UUID=6f6600c4-5577-4617-b312-649fc2e2706a swap swap defaults 0 0
UUID=93cc01f6-98e7-445b-bdc4-37356588e957 /home ext4 defaults 0 0
My mdadm.conf file reads -
MAILADDR root
ARRAY /dev/md1 level=raid1 num-devices=2
UUID=1c0ba7ba:5b4e8354:14c0bbc3:de3ed72e
ARRAY /dev/md127 level=raid1 num-devices=2
UUID=1bcb5496:c7d158e6:14c0bbc3:de3ed72e
ARRAY /dev/md3 level=raid1 num-devices=2
UUID=1cea36b2:9f1a3ab8:14c0bbc3:de3ed72e
ARRAY /dev/md5 level=raid1 num-devices=2
UUID=ab27f39f:f0e972c9:14c0bbc3:de3ed72e
ARRAY /dev/md7 level=raid1 num-devices=2
UUID=398fe67f:959048ba:14c0bbc3:de3ed72e
ARRAY /dev/md6 level=raid1 num-devices=2
UUID=9b98d1c6:73b621e1:14c0bbc3:de3ed72e
The entries for the disks in /dev/disk/by-uuid -
lrwxrwxrwx 1 root root 10 2009-12-13 15:44
3b891301-1b89-447b-81e3-4ddc5c835b3f -> ../../sda6
lrwxrwxrwx 1 root root 9 2009-12-13 15:44
e0eb5abe-1765-48f7-923f-da8295b54313 -> ../../md6
I copied the initramfs-2.6.31.6-166.fc12.x86_64.img file to another
directory and decompressed and extracted it and the only reference I
found in there to the raid disks was in etc/mdadm.conf which was
identical what is in /etc/mdadm.conf
I can mount /dev/md6 manually (as something other than /usr) with no issues
I think I'm missing something pretty simple, another set of eyes would
be appreciated
TIA, Jeff
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On Sun, 2009-12-13 at 16:54 -0500, Jeffrey Ross wrote:
> I'm trying to mirror my two disks in my system (F12 x86_64)...
>
> I have the following disk partitions
> Filesystem 1K-blocks Used Available Use% Mounted on
> /dev/md127 7692840 508960 6793104 7% /
> tmpfs 1016196 260 1015936 1% /dev/shm
> /dev/md1 380760 44094 316993 13% /boot
> /dev/sda6 7684844 3956688 3337780 55% /usr
> /dev/md5 7692776 418204 6883800 6% /var
> /dev/md7 934037448 388908936 497682148 44% /home
>
> I am trying to get /dev/sda6 and /dev/sdb6 to become a RAID-1 volume...
>
> I have created /dev/md6 as a degraded array and copied everything from
> /dev/sda6 to /dev/md6 in single user mode (actually booted from the
> recovery CD) and after mounting both partitions ran "find . -depth |
> cpio --passthrough --reset-access-time --make-directories
> --preserve-modification-time /mnt2" (/dev/md6 was mounted on /mnt2).
> The copy took a few minutes and completed successfully.
>
> I then modified my /etc/fstab to read (only showing physical disks) (I
> commented the old UUID and added the new UUID)
>
> UUID=abcf3490-11d2-4641-bf47-c33d1614066d / ext4 defaults 1 1
> UUID=e28d03fe-50ec-4313-a281-f1abecd4ed10 /boot ext4 defaults 1 2
> # following is /dev/sda6
> #UUID=3b891301-1b89-447b-81e3-4ddc5c835b3f /usr ext4 defaults 1 2
> # following is /dev/md6
> UUID=e0eb5abe-1765-48f7-923f-da8295b54313 /usr ext4 defaults 1 2
> UUID=e35b19c3-b303-49fc-87d4-0712ac3de571 /var ext4 defaults 1 2
> UUID=6f6600c4-5577-4617-b312-649fc2e2706a swap swap defaults 0 0
> UUID=93cc01f6-98e7-445b-bdc4-37356588e957 /home ext4 defaults 0 0
>
> My mdadm.conf file reads -
>
> MAILADDR root
> ARRAY /dev/md1 level=raid1 num-devices=2
> UUID=1c0ba7ba:5b4e8354:14c0bbc3:de3ed72e
> ARRAY /dev/md127 level=raid1 num-devices=2
> UUID=1bcb5496:c7d158e6:14c0bbc3:de3ed72e
> ARRAY /dev/md3 level=raid1 num-devices=2
> UUID=1cea36b2:9f1a3ab8:14c0bbc3:de3ed72e
> ARRAY /dev/md5 level=raid1 num-devices=2
> UUID=ab27f39f:f0e972c9:14c0bbc3:de3ed72e
> ARRAY /dev/md7 level=raid1 num-devices=2
> UUID=398fe67f:959048ba:14c0bbc3:de3ed72e
> ARRAY /dev/md6 level=raid1 num-devices=2
> UUID=9b98d1c6:73b621e1:14c0bbc3:de3ed72e
>
>
> The entries for the disks in /dev/disk/by-uuid -
> lrwxrwxrwx 1 root root 10 2009-12-13 15:44
> 3b891301-1b89-447b-81e3-4ddc5c835b3f -> ../../sda6
> lrwxrwxrwx 1 root root 9 2009-12-13 15:44
> e0eb5abe-1765-48f7-923f-da8295b54313 -> ../../md6
>
>
> I copied the initramfs-2.6.31.6-166.fc12.x86_64.img file to another
> directory and decompressed and extracted it and the only reference I
> found in there to the raid disks was in etc/mdadm.conf which was
> identical what is in /etc/mdadm.conf
>
> I can mount /dev/md6 manually (as something other than /usr) with no issues
>
>
> I think I'm missing something pretty simple, another set of eyes would
> be appreciated
>
> TIA, Jeff
I assume that the new setup doesn't boot? (You didn't mention what's
wrong.)
What is the new partition type? (Should be "Linux raid autodetect" or
fb)
.. As for your fstab, why are you using the UUID? I usually remove the
UUID's and use the actual device name, IMHO its far easier to work
with...
- Gilboa
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On Sun, 13 Dec 2009, Jeffrey Ross wrote:
> Date: Sun, 13 Dec 2009 16:54:45 -0500
> From: Jeffrey Ross
> To: For users of Fedora
> User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US;
> rv:1.9.1.4pre) Gecko/20090922 Fedora/3.0-3.9.b4.fc12
> Thunderbird/3.0b4
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> Subject: Software RAID question
> #following is /dev/md6
> UUID=e0eb5abe-1765-48f7-923f-da8295b54313 /usr ext4 defaults 1 2
Try first without UUID:
/dev/md6 /usr ext4 defaults 1 2
boot with selinux in permissive mode. Restore selinuix context on /usr:
restorecon -RvF /usr
reboot. Boot normaly (with selinux in enforcing mode).
If everything is ok, change /dev/md6 back to UUID in fstab.
Also, make sure all partitions of /dev/md6 have ID "raid autodetect".
Gabriel
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On 12/14/2009 03:30 AM, Gabriel VLASIU wrote:
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>
> On Sun, 13 Dec 2009, Jeffrey Ross wrote:
>
>
>> Date: Sun, 13 Dec 2009 16:54:45 -0500
>> From: Jeffrey Ross
>> To: For users of Fedora
>> User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US;
>> rv:1.9.1.4pre) Gecko/20090922 Fedora/3.0-3.9.b4.fc12
>> Thunderbird/3.0b4
>> X-Spam-Status: No, score=-2.6 required=5.0 tests=BAYES_00
>> autolearn=unavailable version=3.2.3
>> Subject: Software RAID question
>>
>
>> #following is /dev/md6
>> UUID=e0eb5abe-1765-48f7-923f-da8295b54313 /usr ext4 defaults 1 2
>>
> Try first without UUID:
> /dev/md6 /usr ext4 defaults 1 2
>
> boot with selinux in permissive mode. Restore selinuix context on /usr:
> restorecon -RvF /usr
>
> reboot. Boot normaly (with selinux in enforcing mode).
>
> If everything is ok, change /dev/md6 back to UUID in fstab.
>
> Also, make sure all partitions of /dev/md6 have ID "raid autodetect".
>
>
> Gabriel
>
> - --
>
> // Gabriel VLASIU
> //
> // OpenGPG-KeyID : 0xE684206E
> // OpenGPG-Fingerprint: 0C3D 9F8B 725D E243 CB3C 8428 796A DB1F E684 206E
> // OpenGPG-URL : http://www.vlasiu.net/public.key
>
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> qkivStKBcRMqc2CFaJGkWaQ=
> =m9A/
> -----END PGP SIGNATURE-----
>
>
I took a break from converting /dev/sd[ab]6 to a raid partition for a
little while and noticed that selinux was complaining (the data has been
moved from system to system before selinux was part of the distribution)
so I disabled selinux. Later I gave it one more shot at creating the
raid volume and it worked. I didn't link selinux to building of the
raid partition until I read your response.
My next question is... what do I do about selinux? I've always disabled
it because my system has always complained about something not being
right with this file or that file.
Thanks!
Jeff
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On Mon, 14 Dec 2009, Jeffrey Ross wrote:
> Date: Mon, 14 Dec 2009 21:03:46 -0500
> From: Jeffrey Ross
> To: "Community assistance, encouragement, and advice for using Fedora."
>
> User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US;
> rv:1.9.1.4pre) Gecko/20090922 Fedora/3.0-3.9.b4.fc12
> Thunderbird/3.0b4
> X-Spam-Status: No, score=-2.6 required=5.0 tests=AWL,BAYES_00
> autolearn=unavailable version=3.2.3
> Subject: Re: Software RAID question
> I took a break from converting /dev/sd[ab]6 to a raid partition for a little
> while and noticed that selinux was complaining (the data has been moved from
> system to system before selinux was part of the distribution) so I disabled
> selinux. Later I gave it one more shot at creating the raid volume and it
> worked. I didn't link selinux to building of the raid partition until I read
> your response.
>
> My next question is... what do I do about selinux? I've always disabled it
> because my system has always complained about something not being right with
> this file or that file.
Well, it you disable the selinux, change something (files, folders) and
enable-it back without reseting context on files an folders, probably
nothing will work anymore.
If selinux is enabled, and something does not work (not just a silly
message from audit daemon - something REALLY does not work) just create a
custom policy. man audit2allow
Gabriel
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// Gabriel VLASIU
//
// OpenGPG-KeyID : 0xE684206E
// OpenGPG-Fingerprint: 0C3D 9F8B 725D E243 CB3C 8428 796A DB1F E684 206E
// OpenGPG-URL : http://www.vlasiu.net/public.key
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