it's probably a silly question, but what about Re: [linux-lvm] diff. in striping between HP-UX and Linux LVM from Heinz Mauelshagen probably it's better to have a linear LV over software RAID-0 Goetz Bock wrote: >On Fri, Sep 14 '01 at 11:32, Pawlowski Julian wrote: > >>ich habe eine Frage zur Funktion von Stripes beim LVM. Wofür genau >>benötigt man diese Funktion? Wird damit das LV auf mehrere der reellen >>Partitionen zwecks Performancegewinn verteilt? >> >Yes, that's exactly the intended bahaviour. if you have n (e.g. 2 or >more) PV than a striped LV is splitted between this n PV. This can >increase performance (like RIAD0 does) but it may backfire, if your PV >are on the same reald device. >If you want to use striped LVs, only use one PV per real device. > >e.g.: 4 HDDs of 40GB each (sda, sdb, sdc, sdd) > >you boot from sda and decide to have a 512MB root/boot partition for >this. Than make 3 swap partitiones on sdb, sdc and sdd. > >on each device make a seccond partition with the rest of the space. >create a PV out of each of this 4 partitions. > >you now have: > >sda: sda1 512MB root/boot > sda2 39.5GB PV1 >sdb: sdb1 512MB swap > sdb2 39.5GB PV2 >sdc: sdc1 512MB swap > sdc2 39.5GB PV3 >sdd: sdd1 512MB swap > sdd2 39.5GB PV4 > >VG1: 118.0GB PV1 PV2 PV3 PV4 > >if you now make a striped LV of 20GB it will use 5GB on each PV and the >stripes will be read from PV1 PV2 PV3 PV4 PV1 PV2 PV3 PV4 ... > >BTW: if you write your question in english a lot more people will be > able to send you a reply. > >PS: und wenn Du willst kann ich Dir das ganze gerne nochmal auf Deutsch > schicken. >
