* [9fans] devfs mirroring
@ 2011-12-02 12:17 Steve Simon
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From: Steve Simon @ 2011-12-02 12:17 UTC (permalink / raw)
To: 9fans
I have a mirrored pair of disks under devfs.
I have a series of 512 byte partitions which
hold different /dev/fs configs, one for mirrored,
one for disk1 only and one for disk2 only. This means
the fossil and venti configs all refer to /dev/fs/XXX and will
work in any mode.
These configs liik like this:
so for normal, mirrored operation
mirror fossil /dev/sdE0/fossil /dev/sdF0/fossil
but for disk 1 only mode
inter fossil /dev/sdE0/fossil
The problem comes with /dev/fs/nvram for my keyfs
which is also 512 bytes. This appears to be empty
in the single disk mode of operation; it works
fine in mirrored operation
I have a suspicion that the problem is the nvram partition
is smaller than the interleave block size (defined in
/sys/src/9/port/devfs.c as 8kbytes.). Though I haven't
walked through the code to prove it.
Anyone noticed this?
what do other prople do - do you use mirroring or is
everyone using coraid raid servers now?
-Steve
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2011-12-02 12:17 [9fans] devfs mirroring Steve Simon
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