Gordan Bobic wrote:
John R Pierce wrote:
all the enterprise SAN guys I've talked with say the Intel x25 drives
are consumer junk, about the only thing they will use is STEC Zeus,
and even then they mirror them.
A couple of points there.
1) Mirroring flash drives is a bit ill advised since flash has a
rather predictable long-term wear-out failure point. It would make
more sense to mirror with a mechanical disk and use the SSD for reads,
with some clever firmware to buffer up the extra writes to the
mechanical disk and return completed status as soon as the data has
been committed to the faster flash disk.
Interesting, a few days ago I read something in the mdadm config about a
config for mirroring over 'slower' links, and was waiting for a proper
use case/excuse to go playing with it ;-) (looking up again)...
-W, --write-mostly
subsequent devices lists in a --build, --create, or
--add command will be flagged as 'write-mostly'. This is valid for
RAID1 only and means that
the 'md' driver will avoid reading from these devices if
at all possible. This can be useful if mirroring over a slow link.
regards,
Yeb Havinga
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