> > I have an array with 6 2TB drives plus a spare. While this works > > well, I can from the munin graphs at > > http://munin.karlsbakk.net/munin/karlsbakk.net/smilla.karlsbakk.net/index.html > > that the WD2001FASS drives (sd[bcfg]) perform some 30% better than > > the Hitachi HDS723020BLA642 drives (sd[eh]). The drives are on a > > mixed set of controllers, so this shouldn't be relevant. Since they > > all are specified to spin on 7200RPM, I find it wierd that the > > performance difference shown by the Munin graph is so big. > > > > Anyone seen something similar? > > Go the the manufacturers web sites and find the spec sheets for the > drivers. > > They will likely list a min speed and a max speed for how fast data is > passing under the head depending on if it is the inner or outer track. > > It basically comes down to if all is working exactly right, the number > of bytes passing under the head times rpm, so if one disk has a higher > bit density the rate will be larger, and this varies quite a bit from > disk to disk. Thanks for the replay WD2001FASS: 4x500GB platters HDS723020BLA642: 3x667GB platters - Shouldn't higher density normally mean higher speed? Vennlige hilsener / Best regards roy -- Roy Sigurd Karlsbakk (+47) 98013356 roy@xxxxxxxxxxxxx http://blogg.karlsbakk.net/ GPG Public key: http://karlsbakk.net/roysigurdkarlsbakk.pubkey.txt -- I all pedagogikk er det essensielt at pensum presenteres intelligibelt. Det er et elementært imperativ for alle pedagoger å unngå eksessiv anvendelse av idiomer med xenotyp etymologi. I de fleste tilfeller eksisterer adekvate og relevante synonymer på norsk. -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
