On Thursday, 30 December 1999 at 22:34:04 -0800, Mike Smith wrote:
>> That is interesting. So I guess the conclusion to this is, softupdates
>> is useful for bursty IO, but not sustained because it can get far behind
>> until it eventually reaches the point where the machine reboots silently.
>> I guess the delay until reboot is dependent on the size of max_softdeps.
>> If it is big, it takes a while.
>
> I mentioned this a while back in the context of suspended I/O (in this
> case, a RAID array busy dealing with a failed disk). There wasn't much
> interest in dealing with it evinced at that point.
On a related topic, I've taken to limiting the number of outstanding
transactions in Vinum, mainly to try to hunt down some strange
consistency problems when a very large number of transactions were
outstanding (for those of you who have been following this, this was
the "NULL b_biodone" syndrome). I still think there is a problem
hidden in the system which causes this.
Greg
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