Blizzard PPC + scsi drive

[kreciu]

I finally get to test scsi HDD in my Blizzard PPC and I'm disappointed or to say it nicer not as happy as I would like to be .

When I check speed of this HDD (10000 rpm, 40gb HDD) I'm getting MAX 10Mb/s. ONLY that much. Sure, it is way better then standard IDE controller and system runs VERY nice . However, my FastAta with CF card get ~7Mb/s and have instant access time.

Can someone show me some benchmarks from Blizzard PPC and scsi drive, I can't find it? What is your experience with scsi?

If you have any ideas, please let me know I'm 100% new to scsi devices and Amiga .

[lionstorm]

I dont think you will get more because the BPPC+ is Fast SCSI-2 so limited to 10Mb/s (AFAIR).

[zipper]

Exactly!

[kreciu]

That is EXACTLY what I was looking for . Those 10Mb/s is not bad, but I saw Cyberstorm PPC and I think it did something like 20Mb/s. I wish AmigaOS4.1 would support scsi on BPPC .

Thank you for clarification!

[Bennymee]

That is EXACTLY what I was looking for . Those 10Mb/s is not bad, but I saw Cyberstorm PPC and I think it did something like 20Mb/s. I wish AmigaOS4.1 would support scsi on BPPC .

Thank you for clarification!

The Cyberstorm controler does 40MB/sec, but in practise less. My IBM UW drives with 3.x did ~30, my OS4.1 setup with a 15K harddrive does less.

[kreciu]

Good to know. I really think that maxed our A4000 is really, really nice machine! Maybe someday I will play with it.

I need to say that scsi (despite 10Mb/s) limit is still very fast for Amiga use and my HDD is really quiet. I got used to CF cards, and didn't want regular HDD (my Amiga is really, really quite), but good HDD and all is good.

I just copied 1GB of data from CF to my SCSI drive and it took literally few minutes. NICE!

[Bennymee]

Good to know. I really think that maxed our A4000 is really, really nice machine! Maybe someday I will play with it.

I need to say that scsi (despite 10Mb/s) limit is still very fast for Amiga use and my HDD is really quiet. I got used to CF cards, and didn't want regular HDD (my Amiga is really, really quite), but good HDD and all is good.

I just copied 1GB of data from CF to my SCSI drive and it took literally few minutes. NICE!

The big plus is that the CyberstormPPC uses DMA, while the Amiga onboard IDE does PIO.

[kreciu]

I will ask here. Is there any way to "defragment" Amiga HDD? Is this necessary for AmigaOS?

[Bennymee]

On Aminet there is Reorg, which I used a lot. But the need is less if you have an SSD or SD-card as a Workbench drive these days.

[nbache]

The easiest and fastest way to defragment a volume is to copy everything from it to a separate drive (not another partition on the same drive, that's much slower), quick format the partition, and then copy everything back.

Best regards,

Niels

[pyrre]

SCSI-2 was introduced in 1994 and gave rise to the Fast SCSI and Wide SCSI variants. Fast SCSI doubled the maximum transfer rate to 10 MB/s and Wide SCSI doubled the bus width to 16 bits on top of that to reach a maximum transfer rate of 20 MB/s. However, these improvements came at the cost of reducing the maximum cable length to three meters. SCSI-2 also specified a 32-bit version of Wide SCSI, which used two 16-bit cables per bus. The 32-bit implementation was largely ignored because it was expensive and unnecessary, and was officially retired in SCSI-3.

picked up from the SCSI WIKI

[NinjaCyborg]

Note that there is no point defragging a flash drive or SSD of any kind as they are deliberately fragmented.

[nbache]

Correct. Likewise, my point above about it being slower to copy between partitions on the same drive is of course referring to rotating platter type drives, not flash drives or SSDs.

Best regards,

Niels