Hi list, I am currently running the 2.6.32-rc8 kernel with lvm2 version 2.02.54-1 on debian unstable. Since my root is on LVM as well I use an initramfs for booting. The setup I have consists of 5 disks in a RAID-5 with one PV on top of it. Now for my problem. The md device correctly sets the read-ahead to 4096. If I understand correctly lvm should get this value and set the read-ahead on the LVs accordingly. This is not working correctly for all my LVs. Apart from the FIRST LV on the disk all the others show Read ahead sectors auto - currently set to 256 Since this did not seem to work I changed the RA with lvchange -r 4096 and rebooted. Swap now showed Read ahead sectors 4096 while the other LVs still showed Read ahead sectors 4096 - currently set to 256 lvs -o lv_read_ahead after boot Rahead 2.00m 2.00m 2.00m 2.00m 2.00m blockdev --getra showed 256 for each LV apart from the first one. For testing purposes I took one LV (home) offline and back online again lvchange -an;lvchange -ay After that the readahead was set correctly to 4096. I am not sure what's happening here. I would understand a problem with getting the values automatically but right now they are saved in the metadata but are still set to 256. I am glad for any help on this topic, in the mean-time I am using blockdev --setra to work around this problem. Kind regards, Michael Guntsche _______________________________________________ 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/
