Re: How to increase write speed to local hard drive?

llothar wrote:


If PC's were designed well it wouldn't have an influence because the
condensator in your power supply are able to keep the power for a few
hundert milliseconds. Enough time for the disk to write it, but the OS
does not know that it must immediately stop queuing new data.

Well, as you say, the issue is that systems aren't well designed, or
cheap one's aren't! So to be safe on cheap systems you have to be
cautious, and Solaris is a bit more interested in being safe than linux
typically is. It's kind of the definition of a non-cheap system that
it deals with issues like this properly, so disks can have write caches
which can be used, memory has ECC &c &c...


I was thinking about one of the SCSI features that allows the
controller to map bad blocks to different locations on the disk without
notifying the OS about this change (because in mid 90 the OS didn't do
anything usefull with this information).
So even when the OS thinks that blocks are close together SCSI disks
might need a long way to reach the block (and killing the elevator
algorithm in the OS). I hope that this SCSI feature is now disabled by
default.

I think this is actually OK - if a small number of sectors are remapped
then the bad case will happen only very rarely, which is OK. if a
*large* number are remapped, then chances are very high the disk is
about to die anyway :-)

--tim

.

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