Thursday, November 3, 2011

PAV on Linux on System z

There are various presentations that state the goodness of PAV on Linux. Most revolve around using multipath-tools to assemble a volume if you don't have HyperPAV. But it turns out that the DASD device driver does multipathing for them internally in current kernels (which includes the squeeze kernel).

So all you need to do is setting those alias devices online. When you do that the kernel will log that it detected a new device, but you'll find that it won't create any dasd* device nodes for them, nor will it list partitions. lsdasd will only show you "alias" without mentioning the base volume, but you can fetch that information easily from the uid sysfs entry.

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