Convert E250 To U320?
15/04/2018 14:54
Greetings, Is it possible to convert an E250's internal SCSI backplane from ultra SCSI to U320 SCSI by simply adding a U320 board and connecting a U320 ribbon cable to the backplane? TIA for any and all responses/pointer/suggestions, --Duncan

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15/04/2018 14:54 - HI, Fredrik Lundholm wrote: The disks is very much possible(due to latency) to bottleneck, but the bus not likely.

One could change how and what is layed out on the drives, maybe one drive is very busy and the others are not.

I hade about 20 linux machines booting and mounting root on a single 300Mhz/256MB E250, do problem what so ever ~15-20 % CPU load BUT after a powerfailure in the building all machines tried to boot at the same time :)) that was a problem :) Best thing is faster disks alterned layout, 10k out 15k in makes a big impact on performance, seek time down from ~4.5 to 3.5 ms thats alot.

/michael

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15/04/2018 14:54 - Hi, Duncan D. Sterling wrote: And a new controller i guess! But with only 6 disks I don't thing the U160 bus is the problem, get new disks instead, 15k ones if you don't have it already.

/michael

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15/04/2018 14:54 - Akop Pogosian <akopps+usenet@ocf.berkeley.edu> wrote: : E250's internal SCSI bus is single-ended wide UltraSCSI, not Ultra160.

: I am guessing the bus speed could become a bottleneck for certain : types of I/O load but AFAIK there is nothing you can do it about it.

: If that's not fast enough, just use the internal SCSI bus for system : disks only and hook up an external disk array for your data.

OK, so in other words, it's simply not possible to convert the internal bus to U320 from UltraSCSI with a new controller and ribbon connector? 40 mbit/second bottlenecks pretty quickly on a busy server...

Thanks, --Duncan

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15/04/2018 14:54 - Michael Laajanen <michael.laajanen.no-spam.@telia.com> wrote: E250's internal SCSI bus is single-ended wide UltraSCSI, not Ultra160.

I am guessing the bus speed could become a bottleneck for certain types of I/O load but AFAIK there is nothing you can do it about it.

If that's not fast enough, just use the internal SCSI bus for system disks only and hook up an external disk array for your data.

-- Akop Pogosian This space has been accidentally left blank.


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15/04/2018 14:54 - In article <bqiktf$60i$1@news1.radix.net>, Duncan D. Sterling <buffalo@radix.net> wrote: That's why Sun made it 40Mbyte/s.

Seriously, a E250 with a single 100Mbit/s ethernet card is unlikely to bottleneck the disks.

Do you have more network ports? Then the CPU:s quickly becomes the bottleneck. are you doing IO intensive stuff internally? Then the number of drives makes the difference, not the bus-speed.

/wfr Fredrik -- Fredrik Lundholm dol @ ce.chalmers.se

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