Evren Yurtesen wrote:
>
> There are 4 hosts that have been backed up, for a total of:
>
> * 16 full backups of total size 72.16GB (prior to pooling and
> compression),
> * 24 incr backups of total size 13.45GB (prior to pooling and
> compression).
>
>
> # Pool is 17.08GB comprising 760528 files and 4369 directories (as of
> 3/27 05:54),
That doesn't sound difficult at all. I suspect your real problem is
that you are running a *bsd UFS filesystem with it's default sync
metadata handling which is going to wait for the physical disk action to
complete on every directory operation. I think there are other options
but I haven't kept up with them. I gave up on UFS long ago when I
needed to make an application that frequently truncated and rewrote a
data file work on a machine that crashed frequently. The sync-metadata
'feature' statistically ensured that there was never any data in the
file after recovering since the truncation was always forced to disk
immediately but the data write was buffered so with a fast cycle the
on-disk copy was nearly always empty.
Is anyone else running a *bsd?
>>> Perhaps, but there is a difference if they are moving 10 times or
>>> 100000 times. Where the difference is that the possibility of failure
>>> due to mechanical problems increases 10000 times.
>>
>> No, it doesn't make a lot of difference as long as the drive doesn't
>> overheat. The head only moves so fast and it doesn't matter if it
>> does it continuously. However, if your system has sufficient RAM, it
>> will cache and optimize many of the things that might otherwise need
>> an additional seek and access.
>
> I cant see how you can reach to this conclusion.
Observation... I run hundreds of servers, many of which are 5 or more
years old. The disk failures have had no correlation to the server
activity.
> So you say that a car
> which was driven 10miles have the same possibility of breaking down
> compared to the same model car driven for 100000miles? There are
> frictions involved when head moves in the hard drive.
Cars run under less predictable conditions and need some periodic
maintenance, but yes, I expect my cars to run 100000 miles under their
design conditions without breaking down.
--
Les Mikesell
[EMAIL PROTECTED]
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