On Sat, Dec 22, 2012 at 11:39 AM, Roy Sigurd Karlsbakk <roy@xxxxxxxxxxxxx> wrote: > Hi all > > 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? > > 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. > -- 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. -- 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
