Help! I am having complaints from users about CPU spikes when writing to my
RAID 1 array. Is there a way I can tune software RAID so that writing
updates doesn't interfere with other applications? [can I nice the raid1d
process?]
Specifically I experience giant slowdowns in a hosted application whenever
someone unpacks a tar file or the like. Load averages are 1.10 - 2.00
during writes, but 0.00 to 0.05 otherwise.
root@ns2:~# cat /proc/mdstat
Personalities : [linear] [raid0] [raid1] [raid5]
read_ahead 1024 sectors
md0 : active raid1 hdc1[1] hda1[0]
78979200 blocks [2/2] [UU]
unused devices: <none>
root@ns2:~# cat /etc/raidtab
raiddev /dev/md0
raid-level 1
nr-raid-disks 2
nr-spare-disks 0
chunk-size 4
persistent-superblock 1
device /dev/hda1
raid-disk 0
device /dev/hdc1
raid-disk 1
This is a pentium IV 2.5GHz system with 1GB of RAM.
IDE interface: PCI device 8086:24cb (Intel Corp.) (rev 1). -- 82820
Camino 2 chipset
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