updated 2006-04-13 with 2.6.16.5 ````````````````````````````````` root@sempro:~# time $( dd if=/dev/zero bs=64k count=64k of=/dev/sda2; sync ) 65536+0 records in 65536+0 records out real 1m12.774s ## 59 MB/s user 0m0.050s sys 0m13.690s root@sempro:~# mkreiserfs /dev/sda2 ... ReiserFS is successfully created on /dev/sda2. root@sempro:~# mount /dev/sda2 /mnt/hd/ root@sempro:~# time $( dd if=/dev/zero bs=64k count=64k of=/mnt/hd/zero; sync ) 65536+0 records in 65536+0 records out real 1m27.359s ## 49.1 MB/s user 0m0.070s sys 0m18.510s root@sempro:~# time $( dd of=/dev/null bs=64k count=64k if=/mnt/hd/zero; sync ) 65536+0 records in 65536+0 records out real 1m20.345s ## 53.4 MB/s user 0m0.020s sys 0m11.100s root@sempro:~# rm /mnt/hd/zero root@sempro:~# sync root@sempro:~# time $( dd if=/dev/zero bs=64k count=64k of=/mnt/hd/zero; sync ) 65536+0 records in 65536+0 records out real 1m27.270s ## 49.2 MB/s user 0m0.110s sys 0m17.440s root@sempro:~# uname -r 2.6.16.5a - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - root@sempro:~# fdisk -l Disk /dev/sda: 120.0 GB, 120034123776 bytes 255 heads, 63 sectors/track, 14593 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System /dev/sda1 1 512 4112608+ 7 HPFS/NTFS /dev/sda2 513 1280 6168960 83 Linux /dev/sda3 * 1281 1920 5140800 83 Linux /dev/sda4 1921 14593 101795872+ f W95 Ext'd (LBA) /dev/sda5 1921 1984 514048+ 82 Linux swap /dev/sda6 1985 2112 1028128+ 83 Linux /dev/sda7 2113 2176 514048+ 83 Linux /dev/sda8 2177 2240 514048+ 83 Linux /dev/sda9 2241 2304 514048+ 83 Linux /dev/sda10 2305 2816 4112608+ b W95 FAT32 /dev/sda11 2817 3328 4112608+ 83 Linux /dev/sda12 3329 4352 8225248+ 83 Linux /dev/sda13 4353 9472 41126368+ 83 Linux /dev/sda14 9473 14592 41126368+ 83 Linux /dev/sda15 14593 14593 8001 83 Linux Disk /dev/sdb: 160.0 GB, 160041885696 bytes 255 heads, 63 sectors/track, 19457 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System /dev/sdb1 1 128 1028128+ 82 Linux swap /dev/sdb2 129 896 6168960 83 Linux /dev/sdb3 897 1536 5140800 83 Linux /dev/sdb4 1537 19457 143950432+ f W95 Ext'd (LBA) /dev/sdb5 1537 3072 12337888+ 83 Linux #-->> Using /dev/sda2 + /dev/sdb2 for RAID0 or RAID1 (partitions not set to type fd as the /dev/md0 is not auto boot mount). root@sempro:~# mdadm --create /dev/md0 --chunk=128 --level=1 --raid-devices=2 /dev/sd[ab]2 mdadm: /dev/sda2 appears to contain a reiserfs file system size = 6168896K mdadm: /dev/sda2 appears to be part of a raid array: level=1 devices=2 ctime=Thu Dec 29 09:38:55 2005 mdadm: /dev/sdb2 appears to contain a reiserfs file system size = 6168896K mdadm: /dev/sdb2 appears to be part of a raid array: level=1 devices=2 ctime=Thu Dec 29 09:38:55 2005 Continue creating array? y mdadm: array /dev/md0 started. root@sempro:~# cat /proc/mdstat Personalities : [raid0] [raid1] md0 : active raid1 sdb2[1] sda2[0] 6168896 blocks [2/2] [UU] [==========>..........] resync = 50.8% (3138368/6168896) finish=8.9min speed=5661K/sec unused devices: #-->> wait for resync completion... root@sempro:~# cat /proc/mdstat Personalities : [raid0] [raid1] md0 : active raid1 sdb2[1] sda2[0] 6168896 blocks [2/2] [UU] unused devices: root@sempro:~# time $(dd if=/dev/zero bs=64k of=/dev/md0; sync) dd: writing `/dev/md0': No space left on device 96390+0 records in 96389+0 records out real 1m48.604s ## 59.3MB/s user 0m0.040s sys 0m24.210s root@sempro:~# cat /proc/mdstat Personalities : [raid0] [raid1] md0 : active raid1 sdb2[1] sda2[0] 6168896 blocks [2/2] [UU] unused devices: root@sempro:~# mkreiserfs /dev/md0 mkreiserfs 3.6.18 (2003 www.namesys.com) [...] ReiserFS is successfully created on /dev/md0. root@sempro:~# mount /dev/md0 /mnt/hd/ root@sempro:~# time $(dd if=/dev/zero bs=64k count=64k of=/mnt/hd/zeroes; sync) 65536+0 records in 65536+0 records out real 1m25.189s ## 50.4MB/s user 0m0.060s sys 0m19.290s root@sempro:~# cat /proc/mdstat Personalities : [raid0] [raid1] md0 : active raid1 sdb2[1] sda2[0] 6168896 blocks [2/2] [UU] unused devices: root@sempro:~# time cat /mnt/hd/zeroes >/dev/null real 1m16.177s ## 56.4MB/s user 0m0.020s sys 0m12.620s root@sempro:~# time cat /mnt/hd/zeroes >/dev/null real 1m16.554s ## 56.1MB/s user 0m0.040s sys 0m12.900s root@sempro:~# time dd if=/mnt/hd/zeroes >/dev/null 8388608+0 records in 8388608+0 records out real 1m19.595s ## 54.0MB/s user 0m3.080s sys 0m19.130s root@sempro:~# time dd if=/mnt/hd/zeroes >/dev/null 8388608+0 records in 8388608+0 records out real 1m20.712s ## 53.2MB/s user 0m3.380s sys 0m18.920s root@sempro:~# time dd if=/mnt/hd/zeroes bs=128k >/dev/null 32768+0 records in 32768+0 records out real 1m16.241s ## 56.3MB/s user 0m0.030s sys 0m13.330s root@sempro:~# time dd if=/mnt/hd/zeroes bs=128M >/dev/null 32+0 records in 32+0 records out real 1m16.199s ## 56.4MB/s user 0m0.000s sys 0m18.110s root@sempro:~# umount /mnt/hd/ root@sempro:~# mdadm --stop /dev/md0 root@sempro:~# mdadm --create /dev/md0 --chunk=128 --level=0 --raid-devices=2 /dev/sd[ab]2 mdadm: /dev/sda2 appears to contain a reiserfs file system size = 6168896K mdadm: /dev/sda2 appears to be part of a raid array: level=1 devices=2 ctime=Thu Dec 29 12:43:24 2005 mdadm: /dev/sdb2 appears to contain a reiserfs file system size = 6168896K mdadm: /dev/sdb2 appears to be part of a raid array: level=1 devices=2 ctime=Thu Dec 29 12:43:24 2005 Continue creating array? y mdadm: array /dev/md0 started. root@sempro:~# cat /proc/mdstat Personalities : [raid0] [raid1] md0 : active raid0 sdb2[1] sda2[0] 12337664 blocks 128k chunks unused devices: root@sempro:~# time $(dd if=/dev/zero bs=64k of=/dev/md0; sync) dd: writing `/dev/md0': No space left on device 192777+0 records in 192776+0 records out real 1m48.576s ## 118.6MB/s user 0m0.250s sys 0m38.260s root@sempro:~# root@sempro:~# mkreiserfs /dev/md0 mkreiserfs 3.6.18 (2003 www.namesys.com) [...] ReiserFS is successfully created on /dev/md0. root@sempro:~# mount /dev/md0 /mnt/hd/ root@sempro:~# time $(dd if=/dev/zero bs=64k count=64k of=/mnt/hd/zeroes; sync) 65536+0 records in 65536+0 records out real 0m43.174s ## 99.4MB/s user 0m0.070s sys 0m17.160s root@sempro:~# time dd if=/mnt/hd/zeroes bs=128k >/dev/null 32768+0 records in 32768+0 records out real 0m36.213s ## 118.6MB/s user 0m0.030s sys 0m12.960s root@sempro:~# time dd if=/mnt/hd/zeroes bs=128M >/dev/null 32+0 records in 32+0 records out real 0m36.317s ## 118.3MB/s user 0m0.000s sys 0m17.850s #-->> break the RAID0 root@sempro:~# umount /mnt/hd/ root@sempro:~# mdadm --stop /dev/md0 root@sempro:~# time $(dd if=/dev/zero bs=4k of=/dev/sda2; sync) dd: writing `/dev/sda2': No space left on device 1542241+0 records in 1542240+0 records out real 1m48.589s ## 59.3MB/s user 0m0.570s sys 0m23.310s root@sempro:~# time $(dd if=/dev/zero bs=4k of=/dev/sdb2; sync) dd: writing `/dev/sdb2': No space left on device 1542241+0 records in 1542240+0 records out real 1m46.756s ## 60.3MB/s user 0m0.500s sys 0m22.610s root@sempro:~# uname -r 2.6.15-rc7a root@sempro:~# date Thu Dec 29 14:01:56 EST 2005 - - -