1TB Caviar should be 1024 gigabytes.
hendry@i7 ~$ sudo fdisk -l /dev/sdb Disk /dev/sdb: 1000.2 GB, 1000204886016 bytes 255 heads, 63 sectors/track, 121601 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Disk identifier: 0xdd67f844 Device Boot Start End Blocks Id System /dev/sdb1 1 121601 976760001 83 Linux hendry@i7 ~$ cat /proc/partitions | grep sdb 8 16 976762584 sdb 8 17 976760001 sdb1
/dev/sdb1 on /mnt/home type xfs (rw) /dev/sdb1 932G 4.2M 932G 1% /mnt/home
Totally gut feeling
iotop -b with a
sudo rsync -art /home/ /mnt/home/
Total DISK READ: 54.97 M/s | Total DISK WRITE: 56.83 M/s
Seemed like it was quite a good rate from the
/dev/sda4 on /home type ext4 (rw).
/dev/sdb1 on /mnt/home type reiserfs (rw) /dev/sdb1 932G 33M 932G 1% /mnt/home hendry@i7 ~$ iotop -b | grep Total Total DISK READ: 16.22 M/s | Total DISK WRITE: 11.08 M/s Total DISK READ: 14.20 M/s | Total DISK WRITE: 9.05 M/s Total DISK READ: 14.89 M/s | Total DISK WRITE: 4.66 M/s Total DISK READ: 43.21 M/s | Total DISK WRITE: 39.24 M/s Total DISK READ: 31.01 M/s | Total DISK WRITE: 1994.15 K/s
Bit all over the place during the
rsync. This could be my fault.
Er, wtf? Only 871GB availible from 1024GB?? 153GB has gone missing! 61GB has gone missing compared to xfs/reiserfs!!
/dev/sdb1 on /mnt/home type ext3 (rw) /dev/sdb1 917G 200M 871G 1% /mnt/home
And there is nothing on the damn disk. Wtf is that 200M all about?
Quite a stable-ish:
Total DISK READ: 48.16 M/s | Total DISK WRITE: 45.55 M/s
/dev/sdb1 on /mnt/home type ext4 (rw) /dev/sdb1 917G 200M 871G 1% /mnt/home
Maybe better performance than ext3. Hard to tell.
Total DISK READ: 56.90 M/s | Total DISK WRITE: 56.94 M/s
/dev/sdb1 917G 72M 871G 1% /mnt/home
sudo cp -r /home/ /mnt/home/ seemed slower than
sudo rsync -art /home/ /mnt/home/. Wtf is up with that? I think rsync cleverly launches
threads to speed up it's checksumming operation.
I just took a random
iotop reading which I thought was representative of the
transfer rates I was seeing.
For more details on the hardware please view Linux i7 rig.
So two disks with the same data from a
sudo rsync --delete -art /home/ /mnt/home/.
/dev/sda4 130G 90G 35G 73% /home /dev/sdb1 932G 99G 833G 11% /mnt/home
Ummm, wtf does the xfs drive take 10% more?