I just installed CentOS 5.4 64 bit release on a 1.9ghz CPU with 8gB of RAM. It has 2 Western Digital 1.5TB SATA2 drives in RAID1.
[root@server ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/md2 1.4T 1.4G 1.3T 1% / /dev/md0 99M 19M 76M 20% /boot tmpfs 4.0G 0 4.0G 0% /dev/shm [root@server ~]#
Its barebones right now. Nothing really running. I intended to move our current email server over to it eventually. The thing is slow as mud due to disk I/O though. I have no idea whats going on.
Here is a bit of iostat -x output.
[...]
Does anyone have an idea what I have wrong here? This is my first software RAID install. Built a number of Centos servers without RAID and they have all worked fine.
Did you just create the RAIDs? It will something that size a few hours to complete the initial sync. Try 'cat /proc/mdstat' to see when the sync completes. Until then, expect to have head contention with anything else that might be trying to use the drives.
Here is what I got there. Md1 is swap I beleive:
[root@server ~]# uptime 17:20:54 up 7 days, 3:26, 2 users, load average: 3.41, 2.93, 2.89 [root@server ~]# [root@server ~]# [root@server ~]# cat /proc/mdstat Personalities : [raid1] md0 : active raid1 sdb1[1] sda1[0] 104320 blocks [2/2] [UU]
md1 : active raid1 sdb2[1] sda2[0] 8385856 blocks [2/2] [UU]
md2 : active raid1 sdb3[1] sda3[0] 1456645568 blocks [2/2] [UU]
unused devices: <none>