Hi ZFS Guru's.
I have a questions, that I can't find a definitive answer for searching the
list. Perhaps I will find true enlightenment here, at least on this question :)
I have a T2000 running Sol 10u8. Thus it is is running zpool v15. The system
has four SAS bays, two of which are the rpool drives, and the other two are to
be used as log devices. This guy is a large NFS server. About four months
ago, I did the analysis with zilstat.ksh and determined that a log device would
help, which it certainly has. So I have one Intel X25e in use in the third
slot. But now we are wanting to add another pool (for various reasons, it is
better to keep this new pool separate,but that's a subject for another email).
I want to add a log device for the new pool, which is fine, since I can use the
forth and final SAS slot for that.
But here's what's keeping me up at night: We're running zpool v15, which as I
understand it means if an X25e log fails, the pool is toast. Obviously, the
log devices are not mirrored. My bad :( I guess this begs the first question,
which is:
- if the machine is running, and the log device fails, AND the failure is
detected as such, will the ZIL roll back into the main pool drives? If so, are
we saved?
- Second question, how about this: partition the two X25E drives into two, and
then mirror each half of each drive as log devices for each pool. Am I missing
something with this scheme? On boot, will the GUID for each pool get found by
the system from the partitioned log drives?
Please give me your sage advice. Really appreciate it.
Jon
- _____/ _____/ / - Jonathan Loran - -
- / / / IT Manager -
- _____ / _____ / / Space Sciences Laboratory, UC Berkeley
- / / / (510) 643-5146 jlo...@ssl.berkeley.edu
- ______/ ______/ ______/ AST:7731^29u18e3
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