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On Jun 21, 2005, at 1:41 PM, Len Gerstel wrote:
On Tuesday, June 21, 2005, at 04:04 PM, GDB-B&W-X.3.9 wrote:
On Jun 21, 2005, at 12:36 AM, Len Gerstel wrote:
On Jun 20, 2005, at 9:14 PM, GDB-B&W-X.3.9 wrote:
While doing some file copying on the new fileserver, I've noticed
that data being copied to an IDE drive is going faster than to
another SCSI drive. Of course the SCSI drives are both FAT32 at
the moment, could this be the reason or is the IDE bus faster than
the SCSI on a beige G3? The IDE drive is formatted as Mac
Extended.
What are the drive capacity or ages of the drives? Newer IDE drives
are generally faster than older scsi drives.
IDE is a Maxtor 20 Gb, 5400 rpm model, possibly ATA-100. SCSI drives
are those large Seagate (full-size 5.25") models with roughly a 50 Gb
capacity. Also the SCSI drives have 68 pin connectors being reduced
down to 50 pin by adapters. I started a copy operation (10 Gb) from
one SCSI drive to another and when roughly 1 Gb had been transferred
I started a second operation (12 Gb) from the same source SCSI drive
but this time to the IDE drive. By the time the first operation was
half way done, the second operation had caught up to it in the amount
of data transferred. I just thought it might have something to do
with the SCSI drives being formatted as FAT32.
My first guess is you maxed out the SCSI bandwidth, doing 2 reads and
a write concurrently, while only writing to the IDE. If this is on
the internal SCSI connector, it has a THEORETICAL maximum bandwidth of
10 MB/s, while the IDE has, IIRC, a 16MB/s bandwidth. So to completely
simplify things, The read disk was pumping data where it could and the
fattest pipe was to the IDE disk, so that was the easiest to feed data
to.
ie: read data for copy to other scsi @ 3.33MB/s
write data to other scsi @ 3.33 MB/s
read data for copy to IDE drive @3.33
These three max out the scsi bandwidth
write data to IDE drive wide open at 16MB/s
Also, were the files being copied the same size? A lot of little files
takes a lot longer than one large file.
Plus, the read disk was thrashing around reading from 2 separate areas
of the drive.
I would try doing a copy of the same folder or set of files to each
drive (one drive at a time) and try timing that and seeing what the
results are.
Len
--
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H a r r y ( * ^ _ ^ * )
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