> We are having issues with some Oracle databases on
> ZFS. We would appreciate any useful feedback you can
> provide.
> [...]
> The issue seems to be
> serious write contention/performance. Some read
> issues also exhibit themselves, but they seem to be
> secondary to the write issues.
What hardware is used? Sparc? x86 32-bit? x86 64-bit?
How much RAM is installed?
Which version of the OS?
Did you already try to monitor kernel memory usage,
while writing to zfs? Maybe the kernel is running out of
free memory? (I've bugs like 6483887 in mind,
"without direct management, arc ghost lists can run amok")
For a live system:
echo ::kmastat | mdb -k
echo ::memstat | mdb -k
In case you've got a crash dump for the hung system, you
can try the same ::kmastat and ::memstat commands using the
kernel crash dumps saved in directory /var/crash/`hostname`
# cd /var/crash/`hostname`
# mdb -k unix.1 vmcore.1
::memstat
::kmastat
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