09-27-06 06:16 AM
Will wrote:
...
> We tried ServerMagic (server version of PartitionMagic) and the performanc
e
> is awful. It took six hours to mirror an 8GB drive from a 9GB SCSI 15K
> source drive to a 15K destination drive.
>
> The main bottleneck in ServerMagic was that it was not asynchronous on rea
d
> and write. It would first read the drive and stop writing to the target,
> then stop reading and write to the target. That has to more than double
> the time it takes to do the job?
I'm guessing that you may have had some hardware problem that, e.g.,
caused a great many SCSI errors and retries. My only personal
experience with Partition Magic is with versions 6 and 8, both of which
will copy a full 8 GB partition between ATA disks in about 15 minutes
(an average speed of a little under 10 MB/sec, which is consistent with
the synchronous reading/writing that you describe - even a bit slow,
actually). However, I usually don't copy the partition that I'm booted
from, so it doesn't drop back into DOS mode to do so: I have
occasionally done that (though not since it aborted due to a PM V6
internal stack problem, with disastrous consequences for my system) and
do recall it taking somewhat longer, but nothing like hours.
- bill
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