A buglet with LVM-0.9.1

A buglet with LVM-0.9.1

[J Sloan]

Hi,

I discovered that lvm seems to have a problem
with compaq raid controllers - the partitions
don't have the normal names like /dev/sda1,
but instead names like /dev/ida/c0d0p1 -

lvm seems to works OK, but lvmdiskscan freaks...

lvmdiskscan works normally on other systems,
which have conventional disk controllers.

This is OK -
case: /tmp
(tty/dev/pts/1): bash: 623 > lvscan
lvscan -- ACTIVE           "/dev/lxlvm/lvm1" [3.12 GB]
lvscan -- 1 logical volumes with 3.12 GB total in 1 volume group
lvscan -- 1 active logical volumes

This is OK too -
case: /tmp
(tty/dev/pts/1): bash: 622 > df
Filesystem           1k-blocks      Used Available Use% Mounted on
/dev/ida/c0d0p1        1007928    220124    736604  24% /
/dev/ida/c0d0p8        2015904    251196   1662304  14% /home
/dev/ida/c0d0p7        1007928       240    956488   1% /opt
/dev/ida/c0d0p9        4031856   1660664   2166380  44% /usr
/dev/ida/c0d0p3        2015920     61768   1851744   4% /var
/dev/lxlvm/lvm1        3225352   1888308   1173204  62% /disks/backup

But this is not in agreement:
case: /tmp
(tty/dev/pts/1): bash: 625 > lvmdiskscan -v
lvmdiskscan -- reading all disks / partitions (this may take a while...)

lvmdiskscan -- filling directory cache...
lvmdiskscan -- walking through all found disks / partitions
lvmdiskscan -- /dev/ida/c0d0p1  [    1000.06 MB] free whole disk
lvmdiskscan -- no valid disks / partitions found
lvmdiskscan -- please check your disk device special files!

Hope this is of use -

jjs





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Re: A buglet with LVM-0.9.1

[Alan Cox]

> I discovered that lvm seems to have a problem
> with compaq raid controllers - the partitions
> don't have the normal names like /dev/sda1,
> but instead names like /dev/ida/c0d0p1 -

Quite a few controllers do this i2o, ida, dac960, .. . The user tools really
need to cope with it. Its been true for a fair while and ended up necessary
before /dev/ simply got too big

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Re: A buglet with LVM-0.9.1

[Andreas Dilger]

J Sloan writes:
> I discovered that lvm seems to have a problem
> with compaq raid controllers - the partitions
> don't have the normal names like /dev/sda1,
> but instead names like /dev/ida/c0d0p1 -
> 
> lvm seems to works OK, but lvmdiskscan freaks...
> 
> lvmdiskscan -- filling directory cache...
> lvmdiskscan -- walking through all found disks / partitions
> lvmdiskscan -- /dev/ida/c0d0p1  [    1000.06 MB] free whole disk
> lvmdiskscan -- no valid disks / partitions found
> lvmdiskscan -- please check your disk device special files!

LVM _should_ take care of such devices as well, because there are several
block devices which don't live directly in /dev, especially with devfs.
According to "lvm_dir_cache.c", it should already check /dev/ida for disks.

If it doesn't work for you, this is a bug.  It would be useful if you ran
"lvmdiskscan -d" and "cat /proc/partitions" and sent the output to
linux-lvm@sistina.com

Cheers, Andreas
-- 
Andreas Dilger  \ "If a man ate a pound of pasta and a pound of antipasto,
                 \  would they cancel out, leaving him still hungry?"
http://www-mddsp.enel.ucalgary.ca/People/adilger/               -- Dogbert
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