Huge mdadm resync problem.

["Phantazm" <phantazm@phantazm.nu>]

This is really wierd problem with mdadm.

I currently have 8 Maxtor 200gb disks.
They are connected like this

hdb hdc hdd = onboard ide
hde hdf hdg hdh = Promise ata133 card
hdk = Promise ata 133 card.

Hardware is a P4 2.8ghz with 2gb of ram and a MSI NEO 2 mobo.

Problem is that te resync is really slow and when it's done it just loops 
and the box craches.
Here are some info.

Currently i'm testing a resync with a non HT/SMP config and noapic just to 
check that is no irq routing crap. (failed before though)

merlin / # uname -a
Linux merlin 2.6.10-gentoo-r6 #16 Thu Feb 17 11:00:11 CET 2005 i686 Intel(R) 
Pentium(R) 4 CPU 2.80GHz GenuineIntel GNU/Linux


merlin / # cat /proc/interrupts
           CPU0
  0:    6621371          XT-PIC  timer
  1:          8          XT-PIC  i8042
  2:          0          XT-PIC  cascade
  3:    1487791          XT-PIC  eth1
 10:    1628242          XT-PIC  eth0, eth2
 11:     112644          XT-PIC  ide2, ide3
 12:      35197          XT-PIC  ide5
 14:      71092          XT-PIC  ide0
 15:      63376          XT-PIC  ide1
NMI:          0
ERR:      40328

cat /proc/mdstat
Personalities : [raid5]
md0 : active raid5 hde1[0] hdb1[8] hdd1[7] hdk1[6] hdc1[4] hdh1[3] hdg1[2] 
hdf1[1]
      1393991424 blocks level 5, 64k chunk, algorithm 2 [8/7] [UUUUU_UU]
      [=>...................]  recovery =  5.5% (11110168/199141632) 
finish=1641.7min speed=1906K/sec
unused devices: <none>

(The resync speed is always somewhere between 500K to 3000K/s) should be 
10000K/s  ;-)


This is the kernelog. it's just a lil grab in it since this list goes on 
untill i reboot the box. (its freezed).
This is what i get when sync is finiched and it should markt the array good.
Feb 17 07:17:08 [kernel] md: using maximum available idle IO bandwith (but 
not more than 150000 KB/sec) for reconstruction.
Feb 17 07:17:08 [kernel] md: md0: sync done.
Feb 17 07:17:08 [kernel] .<6>md: syncing RAID array md0
Feb 17 07:17:08 [kernel] md: md0: sync done.
Feb 17 07:17:08 [kernel] .<6>md: syncing RAID array md0
Feb 17 07:17:08 [kernel] md: md0: sync done.
Feb 17 07:17:08 [kernel] .<6>md: syncing RAID array md0
Feb 17 07:17:08 [kernel] md: md0: sync done.
Feb 17 07:17:08 [kernel] .<6>md: syncing RAID array md0
Feb 17 07:17:08 [kernel] md: md0: sync done.
Feb 17 07:17:08 [kernel] .<6>md: syncing RAID array md0
Feb 17 07:17:08 [kernel] md: md0: sync done.
Feb 17 07:17:08 [kernel] .<6>md: syncing RAID array md0
Feb 17 07:17:08 [kernel] md: md0: sync done.
Feb 17 07:17:08 [kernel] .<6>md: syncing RAID array md0
Feb 17 07:17:08 [kernel] md: md0: sync done.
Feb 17 07:17:08 [kernel] .<6>md: syncing RAID array md0
Feb 17 07:17:08 [kernel] md: using maximum available idle IO bandwith (but 
not more than 150000 KB/sec) for reconstruction.
Feb 17 07:17:08 [kernel] .<6>md: syncing RAID array md0
Feb 17 07:17:08 [kernel] md: md0: sync done.
Feb 17 07:17:08 [kernel] .<6>md: syncing RAID array md0

I've also tried to have 4 disks on each promise card with same result. (if 
having apic i get alot of cpu apic error 60)
i have checked all disks with smarttool and also benchmarked them. Each disk 
gets about (hdparm) -T = 1800mb/s and -t 60mb/s so i doubt that
theres actually a broken disk.

i'm running mdadm 1.7.0

This is toally bugging me out.
Help is really really apricated.