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.
Sure. There are a couple ways I can think of using such a thing:
1) put an md intent bitmap on the NVRAM device for faster resyncs
2) use the NVRAM as a write journal for md to make md raid4/5/6 reliable
(if the system crashes while an md raid5 is degraded, i.e., missing a
disk, there is a chance of silent data corruption). The md driver does
not currently do write journalling, so this would require some code changes.
--
Paul
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