SCSI interface cards.

[gary artim]

 see below...

>  gary artim wrote:
>  > Hi Roger / All  --
>  >
>  > ls -la
>  > -rw-r--r-- 1 root root 8130652160 2008-04-08 11:07 sys.dump
>  >
>  > dd if=sys.dump of=/dev/null
>  > 15880180+0 records in
>  > 15880180+0 records out
>  > 8130652160 bytes (8.1 GB) copied, 28.5627 s, 285 MB/s
>  >
>  > I did the test you recommend and got the above. I think I could come
>  > close to flooding that interface. I was looking at the:
>
>  So long as that was coming off of the disk, and you don't have enough ram that
>  some portion of it could be coming from the memory disk cache it is ok, on a
>  machine with more than 8GB of ram if you just made the file, and/or did several
>  tests there is a very high probability that all or part of it is coming from
>  cache and a meaningless test.

This was an old dump I neglected to delete created 2008-04-08.

>
>  >
>  > http://www.newegg.com/Product/Product.aspx?Item=N82E16816103066
>  >
>  > $200.00 (1) Adaptec 2250300-R PCIe x 1 SCSI 29320LPE Kit - new scsi
>  > card to increase  bandwidth on lto4 tape system.
>  > (my current card is U160/133 pci-x, but i have a PCIe x 1 free)
>
>  Keep in mind that PCIe x 1 is 2.5 Gbit per second (around 250MByte/second),
>  actually slower than any typical PCIX slot at any speed (PCIX64 x 66 is 528MByte
>  per second), so you may not get much more than with the U160 card that you
>  started with.
>

Yes yes, I remember when I research the U160 card that the rates are
quite good on pci-x. (da on me!)


You've been a great help, thanks! Gary

>  >
>  > I haven't found any major problems searching the web on this card. Do
>  > you have a recommendation on a LSI card?
>
>  So long as you stay with Adaptec or LSI and make sure that the driver is in the
>  default kernel (no add on drivers) you should be fine.
>
>  >
>  > Thanks much for all you input, I'm mostly a lurker of the list, but
>  > I've learned mucho and keep reading and learing!
>  >
>  > -- Gary
>
>
>
>  ------------------------------