Creating / copying snapshot
[drew@drewserv ~]$ sudo lvcreate -L10G -s -n tmpbkup /dev/vg-raid5/lv-raid5
Logical volume "tmpbkup" created
[drew@drewserv ~]$ sudo lvs
LV VG Attr LSize Origin Snap% Move Log Copy% Convert
lv-backup vg-backup -wi-ao 698.63g
lv-raid5 vg-raid5 owi-ao 698.63g
tmpbkup vg-raid5 swi-ao 10.00g lv-raid5 0.13
lv_home vg_drewserv -wi-ao 178.44g
lv_root vg_drewserv -wi-ao 50.00g
lv_swap vg_drewserv -wi-ao 3.94g
[root@drewserv ~]# date; dcfldd if=/dev/vg-raid5/tmpbkup of=/dev/vg-backup/lv-backup bs=4M; date
Sun Jul 24 05:29:04 MDT 2011
178688 blocks (714752Mb) written.
178850+0 records in
178850+0 records out
Sun Jul 24 12:14:20 MDT 2011
[root@drewserv ~]# tune2fs -U random /dev/vg-backup/lv-backup
tune2fs 1.41.14 (22-Dec-2010)
[root@drewserv etc]# mount /dev/vg-backup/lv-backup /mnt/backup
[root@drewserv backup]# ls -al /mnt/backup
total 33839996
drwxr-xr-x. 12 root root 4096 Jul 24 05:01 .
drwxr-xr-x. 5 root root 4096 Jul 23 19:05 ..
drwxr-xr-x. 5 user user 4096 Jul 24 00:06 backup
[root@drewserv ~]# lvremove /dev/vg-raid5/tmpbkup
Do you really want to remove active logical volume tmpbkup? [y/n]: y
Logical volume "tmpbkup" successfully removed
[drew@drewserv ~]$ sudo lvs
LV VG Attr LSize Origin Snap% Move Log Copy% Convert
lv-backup vg-backup -wi-ao 698.63g
lv-raid5 vg-raid5 -wi-ao 698.63g
lv_home vg_drewserv -wi-ao 178.44g
lv_root vg_drewserv -wi-ao 50.00g
lv_swap vg_drewserv -wi-ao 3.94g
USB Hard Drive Perf Tests
[root@drewserv backup]# dd if=dell-desktop7.22.2010.tar.gz of=/dev/null bs=4M
6321+1 records in
6321+1 records out
26512197033 bytes (27 GB) copied, 677.563 s, 39.1 MB/s
[root@drewserv backup]# cd
[root@drewserv backup]# dd if=/dev/zero of=/mnt/backup/10Gtest bs=4M count=2500
2500+0 records in
2500+0 records out
10485760000 bytes (10 GB) copied, 316.476 s, 33.1 MB/s
[root@drewserv ~]# umount /mnt/backup/
[root@drewserv ~]# dd if=/dev/vg-backup/lv-backup of=/dev/null bs=4M count=2500
2500+0 records in
2500+0 records out
10485760000 bytes (10 GB) copied, 264.512 s, 39.6 MB/s