Jonathan Brassow [jbrassow@redhat.com] wrote: > Just to answer some questions: > > You can use just 2 disks to create a mirror and a disk log: > prompt> lvcreate --alloc anywhere -m1 -L 500M -n my_lv my_vg > > I wish the allocation policy 'normal' (which is the default) would also do > this... but instead you must choose a looser allocation policy to get what > you want. > > The reason that you want the disk-based log is to prevent all the extra > work when you machine comes up. I wish LVM can detect and only re-sync if needed even with corelog! > The reason that LVM wants a separate disk for the log is so the head on the > storage device doesn't need to go ping-ponging around the device. (The log > is touched for almost every write.) So, its a performance thing... and > possibly a not-wear-out-your-hardware thing too. Nice to know about guaranteed long disk seeks with this approach! --Malahal. _______________________________________________ linux-lvm mailing list linux-lvm@redhat.com https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
