Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
Chris de Vidal wrote: > So my question: do our boxes meet the minimum/recommended spec? Both are > identical: > DRBD 0.7.10 > CentOS 3.4 (same as RedHat Enterprise Linux 3) > Celeron 600 > 1GB ECC RAM > 120GB drives (don't recall the DMA/RPM speed but I can find out if necessary) > 100MBit Intel NICs connected by crossover (don't recall which chipset but > I can find out if necessary) This should be appropriate for DRBD, but maybe not enough for the additional applications. I am running EPIAs at 600 MHz (~Celeron 500), 512 MB, 80+160 = 240 GB, 100 Mbit NIC, very fine with DRBD. > If they do meet spec, any ideas why load peaked so much? I was writing > many small files using dump and restore. I could see how someone could > DoS us by repeatedly hammering our logs or uploading thousands of tiny > files. DRBD adds only little use of RAM and CPU, but it adds traffic on the NICs. Some NICs with bad hardware or bad drivers produce reasonable CPU-usage at full traffic. Most resource comsumption comes from the applications at top of DRBD. Compare benchmarks of DRBD-sync against a large 'cp -a <something>' on ext3/DRBD. > P.S. I just had a thought: perhaps I need to run hdparm. If your HDDs run with UDMA 133 you should get read speeds over 50 MB/sec with 'hdparm -tT /dev/hdx. Second thing is to measure network speed, e.g. with 'bing <own-IP> <peer-IP>. Helmut Wollmersdorfer