On Fri, Feb 10, 2006 at 10:01:09AM +0100, Mirko Benz wrote: > Does a high speed NVRAM device makes sense for Linux SW RAID? E.g. a PCI > card that exports battery backed memory. Unless it's very large (i.e.: as large as one of your disks), it doesn't make sense. It will probably break less often, but it doesn't help you in case a disk really breaks. It also won't speed up an MD device much. > Could that significantly improve write speed for RAID 5/6 (e.g. via an > external journal, asynchronous operation and write caching)? You could use it for an external journal, or you could use it as a swap device. > What changes would be required? None, ext3 supports external journals. Look for the -O option in the mke2fs manual page. Using the NVRAM device as swap is not different from a using "normal" swap partition. Erik -- +-- Erik Mouw -- www.harddisk-recovery.com -- +31 70 370 12 90 -- | Lab address: Delftechpark 26, 2628 XH, Delft, The Netherlands - 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
