On Sat, Jul 16, 2011 at 03:16:29AM -0300, Christiano F. Haesbaert wrote: > Hi there, I have a local mirror of cvs src, everything works fine, except that > the IO seems to take place in another disk. > > I have a very very very very slow udma controller in wd0 (the ultra 5 one): > > wd0(pciide0:0:0): using PIO mode 4, DMA mode 2 > > So I keep my cvs in a faster controller/disk: > > wd1(pciide1:2:0): using BIOS timings, Ultra-DMA mode 7 > > I have this, so you can see, most stuff is on the slow controller. > > /dev/wd0a on / type ffs (local) > /dev/wd0d on /tmp type ffs (local, nodev, nosuid) > /dev/wd0g on /usr type ffs (NFS exported, local, nodev) > /dev/wd0e on /var type ffs (local, nodev, nosuid) > /dev/wd1a on /data/sta type ffs (NFS exported, local, nodev, nosuid) > > Here is the weird part, /cvs points to /data/sta/cvs (which is in the fast > controller) > > lrwxr-xr-x 1 root wheel 14 Jul 13 19:55 cvs@ -> /data/sta/cvs/ > > Now watch what happends when I 'cvs up' from another machine: > > == No cvs up, disk mostly idle == > > gandalf:haesbaert: iostat -w 3 > tty wd0 cd0 wd1 cpu > tin tout KB/t t/s MB/s KB/t t/s MB/s KB/t t/s MB/s us ni sy in id > 0 41 11.68 3 0.03 0.00 0 0.00 49.91 5 0.25 1 0 2 1 96 > 0 74 0.00 0 0.00 0.00 0 0.00 0.00 0 0.00 0 0 0 0100 > 0 98 13.71 7 0.09 0.00 0 0.00 0.00 0 0.00 0 0 0 0100 > > == cvs up, wd1 transaction should go up roof == > gandalf:haesbaert: iostat -w 3 > tty wd0 cd0 wd1 cpu > tin tout KB/t t/s MB/s KB/t t/s MB/s KB/t t/s MB/s us ni sy in id > 0 41 11.68 3 0.03 0.00 0 0.00 49.91 5 0.25 1 0 2 1 96 > 0 98 9.52 263 2.45 0.00 0 0.00 0.00 0 0.00 5 0 9 3 84 > 0 25 9.53 277 2.58 0.00 0 0.00 0.00 0 0.00 1 0 5 0 94 > 0 49 9.51 282 2.62 0.00 0 0.00 0.00 0 0.00 2 0 7 1 90 > 0 49 9.67 258 2.44 0.00 0 0.00 64.00 0 0.02 1 0 5 1 93 > > > But no, IO seems to take place mostly in wd0, I've confirmed swap was not > taking > place, I shut down everything, top showed 100mb+ free: > > load averages: 2.23, 1.02, 0.65 > gandalf.midearth 03:12:25 > 42 processes: 1 running, 40 idle, 1 on processor > CPU states: 1.6% user, 0.0% nice, 4.9% system, 0.4% interrupt, 93.2% idle > Memory: Real: 19M/64M act/tot Free: 176M Swap: 16M/1024M used/tot > > The user doing the cvs has a home in /home/ which is in wd0. > I'm also able to hear wd0 (different sound than wd1), so I know fstat is > telling > the truth. > > What's hapenning ? I'm pretty sure I'm missing something real simple, just to > have > an insight, a 'cvs up' is taking more than 30min. >
cvs is also using /tmp which is on wd0 for temporary files. -- :wq Claudio
