I'm no expert on the filer, but I would have to expect that since the filer caches write in NVRAM, and then writes the data to disk in chunks to minimize parity disk impacts, that this behavior is not out of the ordinary.
There will always be bottlenecks. The real question is, are they ones you can live with.
Jamie Lawrence wrote:
Hi -
Mostly by accident, I just noticed that I can essentially max out my 720 over 100bT on writes. I did this a few times with mostly the same results. This is a production environment, but at an idle period. Notes on sysstat output, below: I first copied it back to the Sun box, and then copied it from there to the 720 again. Reads were a bit high, but within the realm of acceptable; writes were... intense. It is pretty clear in the output where the read stopped and the write started, modulo the averaging.
Is this normal for a 720? I don't forsee 5 saturated 100Bt connections in the near future, but... this does make me wonder about scaling.
Thanks for any thoughts.
-j
Random info: all ports manually forced to 100bT/Fd, connected to a Cisco 2940 (all ports forced), connected to a sun E450 (ditto).
Sysstat log:
homer> sysstat CPU NFS CIFS HTTP Net kB/s Disk kB/s Tape kB/s Cache in out read write read write age 9% 204 0 0 41 1234 1160 24 0 0 39 25% 670 0 0 135 5061 4738 45 0 0 22 25% 677 0 0 132 5359 4088 25 0 0 1 23% 569 0 0 116 4333 4065 38 0 0 0 27% 668 0 0 133 5053 4706 19 0 0 0 22% 532 0 0 105 4011 3758 29 0 0 0 30% 533 0 0 1160 2912 2847 1419 0 0 0 75% 833 0 0 6473 230 637 8216 0 0 0 94% 1040 0 0 8356 217 474 11003 0 0 0 98% 1084 0 0 8686 238 490 11014 0 0 0 17% 186 0 0 1066 61 177 1713 0 0 0 5% 84 0 0 16 141 156 47 0 0 0 5% 59 0 0 10 90 76 36 0 0 0 homer>
ls on the file copied:
# ls -l vmcore.tar -rw------- 1 root other 366733312 Jan 19 23:48 vmcore.tar
#
Jamie Lawrence "Self-knowledge is always bad news." -- John Barth __________________________________________________________ Director of Information Technology Third Age Media 415.267.4657 jal@thirdage.com www.thirdage.com
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