From: Padmanabhan Ramadurai (durai@head-cfa.cfa.harvard.edu)
Date: Fri Aug 22 2003 - 12:34:10 EDT
Hello all,
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Solaris 2.8 (Kernel 108528-22) Disksuite 4.2.1 with 108693-17
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Q1:
Disksuite 4.2.1 Answerbook documentation says that UFS logging can be
enabled/used with all file systems other than /. But System Administrator
Answerbook says that UFS logged could be done all filesystems including
the root (/) file system.
Which info is correct? If ufs-logging indeed cannot be used with some
system filesystems, what are they?
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Q2:
Assuming that ufs-logging can be done all system filesystems,
does it make sense to turn on ufslogging for /,/var and /usr?
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Q3:
What about swap?
Some people suggest that it is plain waste or resource. I'm looking
to learn from collective wisdom here.
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Q4:
(Sunsolve) Bug ID 4361013 [Dirty region bit maps at shutdown can cause
long mirror resyncs on next boot] which was backed out by BugId 4477775;
Later fix (4515606) was again backed out by 4621691.
108693-17 does not seem to fix 4361013/4621691 still.
What is the resolution the community is using for this problem? Just
turning off the logging is the only solution?
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Q5:
My partitions are like below...
> df -kl | grep dsk
/dev/md/dsk/d30 493983 195984 248601 45% /
/dev/md/dsk/d31 2054959 877580 1115731 45% /usr
/dev/md/dsk/d33 493983 135816 308769 31% /var
/dev/md/dsk/d35 2486843 2229707 207400 92% /internal
[d34 is swap and 3GB in size]
On an E3000 (248MHz) with 5GB of RAM, with ufslogging turned ON,
for all filesystems, a soft reboot takes about 90 minutes due to
I believe bugid 4361016.
But
Both with ufslogging turned OFF only for /internal and with
ufslogging turned OFF for all partitions, it takes about 30
minutes for the reboot. (sendmail start time from syslog as
my mile marker)
[no reconfigure, no hardware power on, with min diag in all cases]
This 30min looks rather long for me. I get only the stand warning
force overload warnings. system performance is fine after the reboot.
90 min for reboot is unacceptable when ufslogging is turned on...
I could as well detach the mirros before reboot and attach/resync
them after reboot.
What are the options/suggestions/pointers which would help me here?
thanks a lot,
will summarize next week,
Durai
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