Adaptex 29160 bd problem

Hello all

Anyone know of any known bugs in the aha8 driver for ultra160 scsi.

I am posting the here because I believe this problem is relates to the scsi
driver.

I have a system that take larges amount of image data and stores them to jpg
file on a removable scsi card. it is removable by design because I what to
take this data to another computer for cutting a tape and sending the data
into the main office for processing.

I am using an 29160N or 19160 card with seagate scsi hds (17 gigs). the os
seems to find the card and the hard disk.

it uses the following command

devb-aha8 blk auto=partition dos exec=all

and finds that the disk as a fat32 format.

the drive is accessible from the os and I can read and write to it using the
file manager and programs

here the question?

when I am writing several 1000 files (I want to write out up 30,000 images
per mission) the images seem to take more time as the number of files
increases. for example

it normally take about 270 ms to acquire, compress and save an image file
to disk. when the image count reaches 1200 of more the time starts to climb
up to > 330 ms at > `1500 image files the time climbs to over 500 ms? and so
on…

if I use a QNX disk for image storage the time remains about 270 ms for over
12000 images. i.e. I do not see this problem

please help


\

Greg Orvets
VP Engineering
Lambdat Tech International
orvets@lambdatech.com
614 799 9410

www.lambdatech.com

That’s just hillarious. You’re getting problem when using FAT32, but not
when using QNX filesystem. And you’re blaming Adaptec driver? FYI, QNX does
not even write Adaptec drivers - they just use Adaptec-supplied CHIM (common
hardware interface module) which is OS-independent.

FAT32 is notorious for poor scalability due to usage of file allocation
table. As number of files grow, it takes progressively more time to search
and update the table.

I don’t know what to suggest to you really. Other filesystems won’t be
readable under Windows (perhaps there’s a way to read Linux EXT2 under
Windows?). The only way is to reduce number of files, somehow. If you can,
organize them into some groups (by dates, or somesuch) and then pack groups
into tarballs, so only those tarballs get written to disk.

– igor

“Greg Orvets” <orvets@lambdatech.com> wrote in message
news:afcj26$7ao$1@inn.qnx.com

Hello all

Anyone know of any known bugs in the aha8 driver for ultra160 scsi.

I am posting the here because I believe this problem is relates to the
scsi
driver.

I have a system that take larges amount of image data and stores them to
jpg
file on a removable scsi card. it is removable by design because I what to
take this data to another computer for cutting a tape and sending the data
into the main office for processing.

I am using an 29160N or 19160 card with seagate scsi hds (17 gigs). the os
seems to find the card and the hard disk.

it uses the following command

devb-aha8 blk auto=partition dos exec=all

and finds that the disk as a fat32 format.

the drive is accessible from the os and I can read and write to it using
the
file manager and programs

here the question?

when I am writing several 1000 files (I want to write out up 30,000 images
per mission) the images seem to take more time as the number of files
increases. for example

it normally take about 270 ms to acquire, compress and save an image file
to disk. when the image count reaches 1200 of more the time starts to
climb
up to > 330 ms at > `1500 image files the time climbs to over 500 ms? and
so
on…

if I use a QNX disk for image storage the time remains about 270 ms for
over
12000 images. i.e. I do not see this problem

please help


\

Greg Orvets
VP Engineering
Lambdat Tech International
orvets@lambdatech.com
614 799 9410

www.lambdatech.com