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SCSI isn't dead yet – new SSD for old or obsolete systems

tomshardware.com

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Re: SCSI isn't dead yet – new SSD for old or obsolete systems

#14
post #11

I have some systems that format their SCSI disks to 1,280 byte sectors, so I guess this would not work.

To fit in an IP packet?

Some systems used foats other than 512b, if only to add extra ECC codes (like some raid arrays)

Re: SCSI isn't dead yet – new SSD for old or obsolete systems

#16

SCSIFlash-Fast uses CF or M.2 SSD cards IDE-SATA adapters are very common (and cheap), but this seems like SCSI-SATA which is definitely far less common; I know there is also SAS, but I'm not sure how that compares. There have been IDE-SCSI adapters made in the past too, but they've also become rare and expensive: https://duxbridge.wordpress.com/2012/01/15/creating-ssd-for-... as well as the device being firmware upg…

SAS is basically two channel SATA with independent command queues, and can drive SATA drives, but SATA can't drive SAS.

SATA at 600MB/sec is plenty fast for contemporary mainstream server applications , which you can scale up with RAID 5/6/10 with some error resilience.

For higher throughput (plus more IOPS generally), SAS RAID comes into play. AI and processing servers generally come with NVMe disk stacks, configured with mdraid / RAID 0 generally, because the data is generally ephemeral, so losing the data is highly unlikely. You restart what you do on an other server, most of the time.

There's probably an FPGA or fast DSP which can handle signal/protocol translation with some state handling coprocessor on board, not unlike a (spinning) disk controller.

Re: SCSI isn't dead yet – new SSD for old or obsolete systems

#17
post #9

This is pretty interesting as a retro PC hobbyist. I have Pentium 3 1400-S rig currently running an Adaptec PCI-to-SATA adapter but have a few SCSI drives laying around, so I'm thinking about running the system on SCSI instead of SATA. Probably won't feel as fast but it would feel more "workstation-y". Did anyone run SCSI on a P3 system back in the day?

I did (on a P3-700 then a P3-1200), I can't remember which adaptec interface I used, probably some variant of a 2940
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