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[dm-devel] kernel 2.6 biosraid via device mapper - partition support



hello,

i just started to investigate how biosraid support for the HPT37X IDE-chipsets can be implemented in the 2.6 kernel. implementing the basic raid levels (0, 1, 0+1, JBOD) seems to be pretty straight forward. this can be done by reading the raid signatures of the disks and then pipeing the configuration through dmsetup or using the libdevmapper library directly. what bothers me is the partition support. the number of minor device nodes that are registered per mapped block device is 1. this means that there is no way that the kernel does the partition-handling by itself. the alternative is to do the partition scanning in userspace and to use another device mapper layer to create the partition device nodes. it appears that this was already suggested by Christophe Varoqui ( http://lwn.net/Articles/13958/ ) but this project is now idle. this also has the disadvantage that any changes in the partitioning of the raid volume (e.g. by using *fdisk, distribution installers, ...) require a manual re-invocation of the biosraid setup tool. plus the whole code under linux/fs/partitions/... has to be duplicated so that not only the dos partitioning scheme is supported, but also BSD slices, x86 solaris, windows dynamic disks, ...

which way to go? is there another solution that i have missed?

regards,
Wilfried



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