Messages in this thread | | | Date | Sat, 13 Apr 2002 13:26:16 -0600 | From | Richard Gooch <> | Subject | Re: RAID superblock confusion |
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Neil Brown writes: > On Wednesday April 10, rgooch@ras.ucalgary.ca wrote: > > > > The device is set up (i.e. SCSI host driver is loaded) long before I > > do raidstart /dev/md/0 > > raidstart simply does not and cannot work reliably when your device > numbers change around. It takes the first device listed in > /etc/raidtab and gives it to the kernel. > The kernel reads the superblock, finds some device numbers and tries > to attach those devices. If device number have changed, you loose.
Sounds to me like the flaw is in the ioctl(2) interface, in that it doesn't allow passing all the block devices in the RAID set. If it allowed you to pass all the block devices, then it could check if all the signatures on each block device match.
I tried the alternative of setting persistent-superblock=0 in /etc/raidtab, but the stupid thing complained because it found a superblock. Sigh.
If there was only a "do as I say, regardless" mode, I would be happy. This programmer-knows-best attitude smacks of M$.
Regards,
Richard.... Permanent: rgooch@atnf.csiro.au Current: rgooch@ras.ucalgary.ca - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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