My "root" LV is attached to a LVM Cache Pool that is about 900GB in size. The Origin/Slow LV can do about 560 MB/sec and the Fast/CacheLV can do about double that speed. # lvs LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert root virthost03 Cwi-aoC--- 831.94g [CacheLV] [root_corig] 0.06 8.27 0.00 swap virthost03 -wi-ao---- 4.00g I'm trying see a performance difference, and I would expect these speeds to increase. [root@virthost03 tmp]# echo 1 > /proc/sys/vm/drop_caches [root@virthost03 tmp]# dd if=/dev/virthost03/root of=/dev/null count=1 skip=30 bs=1GB 1+0 records in 1+0 records out 1000000000 bytes (1.0 GB) copied, 5.88505 s, 170 MB/s [root@virthost03 tmp]# echo 1 > /proc/sys/vm/drop_caches [root@virthost03 tmp]# dd if=/dev/virthost03/root of=/dev/null count=1 skip=30 bs=1GB 1+0 records in 1+0 records out 1000000000 bytes (1.0 GB) copied, 6.04174 s, 166 MB/s [root@virthost03 tmp]# echo 1 > /proc/sys/vm/drop_caches [root@virthost03 tmp]# dd if=/dev/virthost03/root of=/dev/null count=1 skip=30 bs=1GB 1+0 records in 1+0 records out 1000000000 bytes (1.0 GB) copied, 6.27378 s, 159 MB/s [root@virthost03 tmp]# echo 1 > /proc/sys/vm/drop_caches [root@virthost03 tmp]# dd if=/dev/virthost03/root of=/dev/null count=1 skip=30 bs=1GB 1+0 records in 1+0 records out 1000000000 bytes (1.0 GB) copied, 8.66593 s, 115 MB/s [root@virthost03 tmp]# Help? _______________________________________________ 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/
