Unable to discover isw raid with 1.0.0-rc3

[Heinz Mauelshagen]

Hi Jane.

On Wed, Aug 18, 2004 at 02:07:49PM -0700, Jane Liu wrote:
> Hi,
> 
> This is in a way continuation of the discussion at
> https://www.redhat.com/archives/ataraid-list/2004-August/msg00013.html. 
> 
> Just tried version 1.0.0-rc3 on my ICH5-R system, and still couldn't
> discover the array.

Well, I didn't get arround to your metadata yet ;)

> The problem I had with 1.0.0-rc2 turned out to be
> caused by bogus disk geometry data ( i guess [heads * sectors *
> cylinders] does not necessarily equal the total sector count).

Yes, 2.6 is still bogus in that regard.

> I noticed
> that in 1.0.0-rc3 the total sector count is not computed from geometry
> data but read from sysfs.

Which was the case in 1.0.0-rc2 as well presumably sysfs was accessibale.

> So now I always end up with a 0 sector count
> because I'm not using sysfs. As a result, I get errors seeking to the
> superblock offset and couldn't find the metadata.
> 
> So is dmraid intended for use with sysfs only now? If not, how can I get
> it to obtain the correct sector count when "carrying on with /dev/"? I
> mean, should I do something outside of dmraid to achieve this? 

Yes, sysfs is meant to be used in 2.6.
Is there a special reason, why you can't use it ?

If so, I need to think about the ioctl workaround you mention below
for such configurations.

Will try to get around to your metadata copies tomorrow...

> 
> For now, I'm getting around this problem by seeking from the end of the
> device file to get to the superblock (since I end up with negative
> superblock offsets). This is kind of an ugly hack. Alternatively, it is
> also possible to get the sector count using the BLKGETSIZE ioctl, which
> is what hdparm uses. I don't know enough about this method to advocate
> for or against it, but it works on my setup.
> 
> Sorry if I'm being over-zealous :-) I need to return the ICH5-R to our
> QA team soon, and I really want to get as much testing done as I can.
> 
> Here's output from "dmraid -r -vvv" with a couple of added prints:
> 
> INFO: locking /var/lock/dmraid/.lock
> ERROR: Failed to find sysfs mount point
> carrying on with /dev/
> INFO: /dev/sdb: hpt37x discovering
> INFO: /dev/sdb: hpt45x discovering
> ERROR: failed seeking device "/dev/sdb" at offset -5632
> INFO: /dev/sdb: isw    discovering
> isw_sboffset is: 0
> ERROR: failed seeking device "/dev/sdb" at offset -1024
> ERROR: isw: failed reading first sector of ISW superblock for /dev/sdb
> INFO: /dev/sdb: lsi    discovering
> ERROR: failed seeking device "/dev/sdb" at offset -512
> INFO: /dev/sdb: pdc    discovering
> ERROR: failed seeking device "/dev/sdb" at offset -32256
> INFO: /dev/sdb: sil    discovering
> ERROR: failed seeking device "/dev/sdb" at offset -512
> INFO: /dev/sda: hpt37x discovering
> INFO: /dev/sda: hpt45x discovering
> ERROR: failed seeking device "/dev/sda" at offset -5632
> INFO: /dev/sda: isw    discovering
> isw_sboffset is: 0
> ERROR: failed seeking device "/dev/sda" at offset -1024
> ERROR: isw: failed reading first sector of ISW superblock for /dev/sda
> INFO: /dev/sda: lsi    discovering
> ERROR: failed seeking device "/dev/sda" at offset -512
> INFO: /dev/sda: pdc    discovering
> ERROR: failed seeking device "/dev/sda" at offset -32256
> INFO: /dev/sda: sil    discovering
> ERROR: failed seeking device "/dev/sda" at offset -512
> INFO: /dev/hda: hpt37x discovering
> INFO: /dev/hda: hpt45x discovering
> ERROR: failed seeking device "/dev/hda" at offset -5632
> INFO: /dev/hda: isw    discovering
> isw_sboffset is: 0
> ERROR: failed seeking device "/dev/hda" at offset -1024
> ERROR: isw: failed reading first sector of ISW superblock for /dev/hda
> INFO: /dev/hda: lsi    discovering
> ERROR: failed seeking device "/dev/hda" at offset -512
> INFO: /dev/hda: pdc    discovering
> ERROR: failed seeking device "/dev/hda" at offset -32256
> INFO: /dev/hda: sil    discovering
> ERROR: failed seeking device "/dev/hda" at offset -512
> No Software RAID disks
> 
> Cheers,
> Jane

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-- 

Regards,
Heinz    -- The LVM Guy --

*** Software bugs are stupid.
    Nevertheless it needs not so stupid people to solve them ***

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Heinz Mauelshagen                                 Red Hat GmbH
Consulting Development Engineer                   Am Sonnenhang 11
                                                  56242 Marienrachdorf
                                                  Germany
Mauelshagen at RedHat.com                            +49 2626 141200
                                                       FAX 924446
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