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PentiumD 3GHz 2GbRAM, LinkSys BEF SR41v4 Etherfast CableRouter with Cat5 cable NV+ 1024Mb RAM, 4 disks X-RAID 500Gb Seagate ST3500630AS, Radiator 3.01c1-p6, UPS monitored, enable cache, disable journal, fast CIFS, Speed Auto-Negotiation, Smart disk check without problems. Averages of several standard IOMeter protocol runs with and without jumbo frames enabled on NV+ (no difference) yielded... MB/s Write=10.5 MB/s Read==9.0 Direct-connect: Jumbo off, enable cache, disable journaling, CIFS writes, on UPS. Run both standard and with the maximum disk size quadrupled to 8192000 sectors with only a small difference. MB/s Write 22 MB/s Read 44 -------------------------------------------------------------------------------- musicfan wrote: Does this diagnose the venerable LinkSys BEF SR41v4 Etherfast CableRouter 10/100 switch as the speed limiter or bottleneck? Thank you. brendan replied: Yes. It's not a deficiency of that particular switch, it's just that a 100 megabit switch can only move data at up to 100 megabits, which is what the original numbers were showing. If you want to get closer to the direct connect speeds, you need a 1000 megabit (aka gigabit) switch instead.

Pardons for that not being exact but I edited out the duplicate gear talk. The story is that after the above testing, I bought an SMC GS8 Gigabit switch and plugged the NV+ and computer (Intel Pro 1000 switch) into the GS8 with Cat5e and re-ran as before (no jumbo frames).

write 19 MB/s
read 33 MB/s

It's not as good as some but far better than before getting the Gigabit switch. I don't understand why the direct was a little better before but am not going to sweat that. Thanks brendan and everyone.

musicfan