-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 The Friday 2005-12-30 at 14:01 +0100, Per Jessen wrote:

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warning: sh-2006: read_super_block: bread failed (dev md0, block 16, size 4096) kernel: ReiserFS: md0: warning: sh-2021: reiserfs_fill_super: can not find reiserfs on md0

But those are warnings, not errors. What is the error you see when you boot and can not mount?

Carlos, the last line is probably key: "can not find reiserfs on md0"

I saw it, but it is not conclusive. The thing is, a raid device (md0) can have a partition table and several partitions, or be directly formatted as reiserfs or whatever. For example, I use a raid of the second type, and I see this message: <5>ReiserFS: md0: found reiserfs format "3.5" with standard journal but if it had a partition table, the message would be different. Thus I need more information, the error messages, to decide.

I'm wondering if /dev/md0 really exists on that system?

Could be, too. Ahhh.... crystal balls are soooo expensive! :-p - -- Cheers, Carlos Robinson -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.0 (GNU/Linux) Comment: Made with pgp4pine 1.76 iD8DBQFDtc8mtTMYHG2NR9URAlUZAKCU/AwFS7Vp0zBtuG8a5pclrClUywCgibhL qUohIRlxxhwp7K8uyutCy+s= =AHE2 -----END PGP SIGNATURE-----

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 The Sunday 2006-01-01 at 19:15 -0000, Con Hennessy wrote:

Yast2 Disk was used to make the RAID disk. It is supposed to be a reiserfs disk but I'm not sure if that means each are done independently or ... ?

My partition table (create using "yast2 disk") has : Device Boot Start End Blocks Id System /dev/hda6 2600 3641 8369833+ fd Linux raid autodetect ... /dev/hdc6 76975 93411 8284216+ fd Linux raid autodetect

And my /etc/raidtab is :

Ok, it seems you have a raid device directly formatted as reiserfs. /dev/md0 /raid0 reiserfs acl,user_xattr 1 2 Can you mount/umount it manually? If there are problems, run a fsck on it while umounted. If the md0 has problems being activated during boot up, it could be that you need to activate some modules in initrd - but as your raid seems to be a data disk not needed for booting up, it doesn't matter, it will activate just a little bit later during boot. Then, if it will not mount automatically during boot, you can configure it "noauto" in fstab, so that you can manually mount it later. I'm just guessing, but it seems you don't have problems with the raid per se, but with the reiserfs on it. Treat it as any other reiserfs problem. - -- Cheers, Carlos Robinson -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.0 (GNU/Linux) Comment: Made with pgp4pine 1.76 iD8DBQFDuHpPtTMYHG2NR9URApZPAKCSFyJXa3ql6Jv/7NOg+9WfKhMSQQCgj5aM h5QCJlQCwIptyrkK/2ESM8Q= =p5oK -----END PGP SIGNATURE-----

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 The Monday 2006-01-02 at 11:20 -0000, Con Hennessy wrote:

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Ok, it seems you have a raid device directly formatted as reiserfs.

/dev/md0 /raid0 reiserfs acl,user_xattr 1 2

Can you mount/umount it manually? No, I still get the error : # mount /raid0 mount: wrong fs type, bad option, bad superblock on /dev/md0, missing codepage or other error (could this be the IDE device where you in fact use ide-scsi so that sr0 or sda or so is needed?) In some cases useful info is found in syslog - try dmesg | tail or so And dmesg shows me : ReiserFS: md0: warning: sh-2006: read_super_block: bread failed (dev md0, block 2, size 4096) ReiserFS: md0: warning: sh-2006: read_super_block: bread failed (dev md0, block 16, size 4096) ReiserFS: md0: warning: sh-2021: reiserfs_fill_super: can not find reiserfs on md0

It seems there is no fs. Perhaps you need to recreate the reiserfs on /dev/md0 - I trust you had no data on it yet. [...] No, keep reading.

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If there are problems, run a fsck on it while umounted. I can do this for both partitions involved in the raid, and no problems were detected.

No, you have to do that on /dev/md0 directly, not the components. If you do on the components, and something is written, they get out of sync, the array is broken.

I then tried to mount one of the partitions but it failed : # mkdir /tmp/xx # mount /dev/hda6 /tmp/xx mount: /dev/hda6 already mounted or /tmp/xx busy

You can not do that while /dev/md0 is active.

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If the md0 has problems being activated during boot up, it could be that you need to activate some modules in initrd - but as your raid seems to be a data disk not needed for booting up, it doesn't matter, it will activate just a little bit later during boot.

Then, if it will not mount automatically during boot, you can configure it "noauto" in fstab, so that you can manually mount it later. I also tried this, but the kernel still insists on trying to mount it during boot. The only way I could find to disable that was to comment out the line in fstab :(

I can understand the kernel activating /dev/md0, but not mounting it. What the kernel would try to do is to fsck it automatically during boot, even if it doesn't want to mount it. If you want to avoid that step, set the last digit to '0' in the fstab line. I think, on a second read of your symptoms, that that is your problem.

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I'm just guessing, but it seems you don't have problems with the raid per se, but with the reiserfs on it. Treat it as any other reiserfs problem.

I'm really not 100% sure about that. My /proc/mdstat shows me : Personalities : [raid1] md0 : inactive hda6[0] hdc6[1] 16653824 blocks

Inactive? Try "mdadm --detail /dev/md0", it gives more detailed info. If it is inactive, it can not be fscked, nor mounted. You will have to activate it first, something went wrong.

But when I look at the size of the partitions I see : /dev/hdc6 76975 93411 8284216+ fd Linux raid autodetect and /dev/hda6 2600 3641 8369833+ fd Linux raid autodetect

From my understanding of raid, the maximum blocks shown by /proc/mdstat should be 8284216 and not nearly twice that !

Unless it were raid 0... or different block size, they don't have to be the same. Copy here all messages related to the raid device during boot; for example, the output of: grep -i -e "raid\|md0\|md:" /var/log/boot.msg Mine shows (suse 9.3): <6>md: md driver 0.90.1 MAX_MD_DEVS=256, MD_SB_DISKS=27 <6>md: Autodetecting RAID arrays. <6>md: autorun ... <6>md: considering hdd13 ... <6>md: adding hdd13 ... <6>md: adding hdb11 ... <6>md: adding hda11 ... <6>md: created md0 <6>md: bind<hda11> <6>md: bind<hdb11> <6>md: bind<hdd13> <6>md: running: <hdd13><hdb11><hda11> <6>md: raid1 personality registered as nr 3 <6>raid1: raid set md0 active with 2 out of 2 mirrors <6>md: ... autorun DONE. <5>ReiserFS: md0: found reiserfs format "3.5" with standard journal <5>ReiserFS: md0: using ordered data mode <5>ReiserFS: md0: journal params: device md0, size 8192, journal first block 18, max trans len 1024, max batch 900, max commit age 30, max trans age 30 <5>ReiserFS: md0: checking transaction log (md0) <5>ReiserFS: md0: Using r5 hash to sort names <5>ReiserFS: md0: using 3.5.x disk format Have a read at /usr/share/doc/howto/en/txt/Software-RAID-HOWTO.gz - -- Cheers, Carlos Robinson -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.0 (GNU/Linux) Comment: Made with pgp4pine 1.76 iD8DBQFDuXz8tTMYHG2NR9URAkewAJwPbu0FV8Hi0LBecv1Ro9+LJwVKwwCffyaH 282CCOsMGLxq7hcX9mpysQY= =uCqy -----END PGP SIGNATURE-----

Con Hennessy wrote:

# mdadm -Q /dev/md0 /dev/md0: is an md device which is not active /dev/md0: is too small to be an md component. I expect this is your problem. What size is your raided partitions? This is saying they are too small.

-- Joe Morris Registered Linux user 231871

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 The Monday 2006-01-02 at 23:34 -0000, Con Hennessy wrote:

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Inactive?

Try "mdadm --detail /dev/md0", it gives more detailed info. If it is inactive, it can not be fscked, nor mounted. You will have to activate it first, something went wrong.

Ok, I manually did : # mdadm --stop /dev/md0 # mkraid --really-force /dev/md0 # mkreiserfs -b 4096 /dev/md0

Which all worked. I was able to mount /dev/md0, edit a file on it, unmount and remount it several times without any problems.

However after a reboot it would not mount. /var/log/message contained the following : <5>Kernel command line: root=/dev/hda3 vga=0x31a selinux=0 splash=silent raid=noautodetect

But this ^^^ option means that the kernel will not autodetect and enable the raid device at start up; from '/usr/src/linux/Documentation/md.txt': | Boot time autodetection of RAID arrays | -------------------------------------- | | When md is compiled into the kernel (not as module), partitions of | type 0xfd are scanned and automatically assembled into RAID arrays. | This autodetection may be suppressed with the kernel parameter | "raid=noautodetect". As of kernel 2.6.9, only drives with a type 0 | superblock can be autodetected and run at boot time. I have 9.3, not 10.0 as you do, but mine works without that option. I'm not sure you need it :-?

<6>md: md driver 0.90.2 MAX_MD_DEVS=256, MD_SB_DISKS=27 <6>md: bitmap version 3.38 <6>md: md0 stopped. <6>md: Autodetecting RAID arrays.

But then I don't understand this.

<6>md: autorun ... <6>md: considering hdc6 ... <6>md: adding hdc6 ... <6>md: adding hda6 ... <6>md: created md0 <6>md: bind<hda6> <6>md: bind<hdc6> <6>md: running: <hdc6><hda6> <4>md: personality 3 is not loaded! <4>md: do_md_run() returned -22 <6>md: md0 stopped. <6>md: unbind<hdc6> <6>md: export_rdev(hdc6) <6>md: unbind<hda6> <6>md: export_rdev(hda6) <6>md: ... autorun DONE. <6>md: raid1 personality registered as nr 3 mdadm: no devices found for /dev/md0

Also # mdadm --detail /dev/md0 mdadm: md device /dev/md0 does not appear to be active.

Perhaps with that option in the kernel line you need to manually activate the raid device later on. I wonder what is the preferred method in SuSE 10.0 :-?

# mdadm -Q /dev/md0 /dev/md0: is an md device which is not active /dev/md0: is too small to be an md component.

Still not getting anywhere ! Con Hennessy

I'm confused. I can not test your system! ;-} - -- Cheers, Carlos Robinson -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.0 (GNU/Linux) Comment: Made with pgp4pine 1.76 iD8DBQFDucz6tTMYHG2NR9URAh2cAJsFv8juFpRj44Xszie3TKyeWiqMIwCfRqI/ YqCrOnqNx01DrWyARpTTYxw= =Kvgf -----END PGP SIGNATURE-----