> -----Original Message----- > From: linux-raid-owner@xxxxxxxxxxxxxxx [mailto:linux-raid- > owner@xxxxxxxxxxxxxxx] On Behalf Of Neil Brown > Sent: Wednesday, December 01, 2010 10:57 PM > To: Hawrylewicz Czarnowski, Przemyslaw > Cc: linux-raid@xxxxxxxxxxxxxxx; Labun, Marcin; Czarnowska, Anna; Neubauer, > Wojciech; Williams, Dan J; Ciechanowski, Ed > Subject: Re: md as module cannot be reloaded. > > On Wed, 1 Dec 2010 14:23:14 +0000 "Hawrylewicz Czarnowski, Przemyslaw" > <przemyslaw.hawrylewicz.czarnowski@xxxxxxxxx> wrote: > > > Hi, > > > > I have found an annoying problem with md module. If it is compiled as > loadable module it is impossible to reload module if unloaded once. > > > > Eg. > > # mdadm -Ss > > # modprobe -r raid1 && modprobe -r md-mod > > # cat /proc/modules | grep md_mod || echo Unloaded > > Unloaded > > # cat /proc/mdstat > > cat /proc/mdstat: Invalid arguments > > I cannot reproduce this. That this point I get > > cat: /proc/mdstat: No such file or directory > > > > # modprobe md-mod > > # cat /proc/mdstat > > cat /proc/mdstat: Invalid argument > > # cat /proc/modules | grep md_mod || echo Unloaded > > md_mod 94178 0 - Live 0xf857a000 > > > > Some functionalities seem to work, but nothing is able to read > /proc/mdstat. > > > > If have tried few kernels from 2.6.27 to 2.6.37-rc3, openSUSE 11.x/RHEL6, > doesn't matter, still the same result. What can be wrong? > > openSUSE doesn't compile md as a module, it is compiled in to the kernel. > But presumably you are compiling your own kernel with md as a module? Is > that right? You aren't compiling a module and loading it into a kernel > which > already has md in it are you? I don't think that would work anyway... Yes, I have recompiled kernel with MD as module. > > And you give a full sequence of commands from loading to unload that > reliably > produces this error for you? Ok, here you are: * Original opensuse config updated to new kernel with defaults * Changed CONFIG_BLK_DEV_MD=y->m * Added prefix -mdadm make su make modules_install make install mdadm -Ss mdadm --zero-superblock /dev/sd[b-g] reboot ... localhost:~ # uname -r 2.6.37-rc3-pae-mdadm localhost:~ # cat /proc/mdstat cat: /proc/mdstat: No such file or directory localhost:~ # cat /proc/modules | grep md_mod localhost:~ # modprobe md_mod localhost:~ # ll /proc/mdstat -r--r--r-- 1 root root 0 Dec 2 00:14 /proc/mdstat localhost:~ # cat /proc/mdstat Personalities : unused devices: <none> localhost:~ # modprobe -r md_mod localhost:~ # ll /proc/mdstat -r--r--r-- 1 root root 0 Dec 2 00:14 /proc/mdstat localhost:~ # cat /proc/mdstat cat: /proc/mdstat: Invalid argument localhost:~ # modprobe -r md_mod localhost:~ # ll /proc/mdstat -r--r--r-- 1 root root 0 Dec 2 00:14 /proc/mdstat localhost:~ # cat /proc/mdstat cat: /proc/mdstat: Invalid argument that's all. > > NeilBrown > > -- > To unsubscribe from this list: send the line "unsubscribe linux-raid" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
