I am wondering if the following idea makes any sense as a way to get
ZFS to cache compressed data in DRAM?
In particular, given a 2-way zvol mirror of highly compressible data
on persistent storage devices, what would go wrong if I dynamically
added a ramdisk as a 3rd mirror device at boot time?
Would ZFS route most (or all) of the reads to the lower latency DRAM
device?
In the case of an un-clean shutdown where there was no opportunity to
actively remove the ramdisk from the pool before shutdown would there
be any problem at boot time when the ramdisk is still registered but
unavailable?
Note, this Gedanken experiment is for highly compressible (~9x)
metadata for a non-ZFS filesystem.
Thanks.
--
Stuart Anderson ander...@ligo.caltech.edu
http://www.ligo.caltech.edu/~anderson
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