Hi. Sry for retry but the lvm list is my last resource. Does Linux-LVM have Parallel scheduler mode for mirroring at all? If yes, how do you set it up, or check if it is enabled? Thanks. Diego 2009/7/12 Diego Jacobi <jacobidiego@gmail.com>: > Hello. > > I have succesfully configured Mirroring between 2 disks in linux for 2 > logical volumes, and on other without mirroring. > But i can not find any evidence showing that it is reading in parallel > scheduler mode. > I have read HP docs about HP-UX, but it talks about command line > options which arent in the linux side. > > The "-d p" in HP-UX would be what i need now for linux. Also lvdisplay > doesnt show anything about it, more than the number of mirrors. > > > This are my tests: > > sda1 = /boot in disk 1, no lvm > sdb1 = /boot in disk 2, no lvm > data/data = lvm without mirroring > data/root = lvm with mirroring > > > linux-8mmd:~ # hdparm -t /dev/sda1 > /dev/sda1: > Timing buffered disk reads: 262 MB in 3.02 seconds = 86.83 MB/sec > > linux-8mmd:~ # hdparm -t /dev/sdb1 > /dev/sdb1: > Timing buffered disk reads: 174 MB in 3.03 seconds = 57.36 MB/sec > > linux-8mmd:~ # hdparm -t /dev/data/data > /dev/data/data: > Timing buffered disk reads: 272 MB in 3.02 seconds = 90.02 MB/sec > > linux-8mmd:~ # hdparm -t /dev/data/root > /dev/data/root: > Timing buffered disk reads: 278 MB in 3.02 seconds = 92.16 MB/sec > > > > As you can see, the read speed are mostly the same. This could mean a > secuenced scheduler. > > And this is my system setup: > > lvm> version > LVM version: 2.02.39 (2008-06-27) > Library version: 1.02.27 (2008-06-25) > Driver version: 4.14.0 > > linux-8mmd:~ # pvs > PV VG Fmt Attr PSize PFree > /dev/sda3 data lvm2 a- 537.11G 395.12G > /dev/sda5 data lvm2 a- 996.00M 988.00M <--- Note 1 Gb, for log > /dev/sdb3 data lvm2 a- 138.99G 118.99G > > linux-8mmd:~ # lvs -a -o +devices > LV VG Attr LSize Origin Snap% Move Log > Copy% Convert Devices > data data -wi-ao 121.50G > /dev/sda3(125) > home data mwi-ao 10.00G home_mlog > 100.00 home_mimage_0(0),home_mimage_1(0) > [home_mimage_0] data iwi-ao 10.00G > /dev/sda3(33788) > [home_mimage_1] data iwi-ao 10.00G > /dev/sdb3(2560) > [home_mlog] data lwi-ao 4.00M > /dev/sda5(1) > root data mwi-ao 10.00G root_mlog > 100.00 root_mimage_0(0),root_mimage_1(0) > [root_mimage_0] data iwi-ao 10.00G > /dev/sda3(31228) > [root_mimage_1] data iwi-ao 10.00G > /dev/sdb3(0) > [root_mlog] data lwi-ao 4.00M > /dev/sda5(0) > test data -wi-a- 500.00M > /dev/sda3(0) > _______________________________________________ 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/
