Hello,
I am trying to create a RAID5 array out of 3 160GB SATA drives. After
i create the array i want to partition the device into 2 partitions.
The system lies on a SCSI disk and the 2 partitions will be used for
data storage.
The SATA host is an HPT374 device with drivers compiled in the kernel.
These are the steps i followed
mdadm -Cv --auto=part /dev/md_d0 --chunk=64 -l 5 --raid-devices=3
/dev/hde /dev/hdi /dev/hdk
Running this command notifies me that there is an ext2 fs on one of
the drives even if i fdisked them before and removed all partititions.
Why is this happening?
In anycase i continue with the array creation
After initialization 5 new devices are created in /dev
/dev/md_d0
/dev/md_d0p1
/dev/md_d0_p1
/dev/md_d0_p2
/dev/md_d0_p3
/dev/md_d0_p4
The problems arise when i reboot.
A device /dev/md0 seems to keep the 3 disks busy and as a result when
the time comes
to assemble the array i get the error that the disks are busy.
When the system boots i cat /proc/mdstat and see that /dev/md0 is a
raid5 array made of the two disks and it comes up as degraded
I can then stop the array using mdadm -S /dev/md0 and restart it using
mdadm -As which uses the correct /dev/md_d0. Examining that shows its
clean and ok
/dev/md_d0:
Version : 00.90.01
Creation Time : Tue May 30 17:03:31 2006
Raid Level : raid5
Array Size : 312581632 (298.10 GiB 320.08 GB)
Device Size : 156290816 (149.05 GiB 160.04 GB)
Raid Devices : 3
Total Devices : 3
Preferred Minor : 0
Persistence : Superblock is persistent
Update Time : Tue May 30 19:48:03 2006
State : clean
Active Devices : 3
Working Devices : 3
Failed Devices : 0
Spare Devices : 0
Layout : left-symmetric
Chunk Size : 64K
Number Major Minor RaidDevice State
0 33 0 0 active sync /dev/hde
1 56 0 1 active sync /dev/hdi
2 57 0 2 active sync /dev/hdk
UUID : 9f520781:7f3c2052:1cb5078e:c3f3b95c
Events : 0.2
Is this the expected behavior? Why doesnt the kernel ignore /dev/md0
and tries to use it? I tried using raid=noautodetect but it didnt help
I am using 2.6.9
This is my mdadm.conf
DEVICE /dev/hde /dev/hdi /dev/hdk
ARRAY /dev/md_d0 level=raid5 num-devices=3
UUID=9f520781:7f3c2052:1cb5078e:c3f3b95c
devices=/dev/hde,/dev/hdi,/dev/hdk auto=partition
MAILADDR myemail@xxxxxxxxxxxx
Furthermore when i fdisk the drives after all of this i can see the 2
partitions on /dev/hde and /dev/hdi but /dev/hdk shows that no
partition exists. Is this a sign of data corruption or drive failure?
Shouldnt all 3 drives show the same partition information?
fdisk /dev/hde
/dev/hde1 1 19457 156288352 fd Linux raid autodetect
fdisk /dev/hdi
/dev/hdi1 1 19457 156288321 fd Linux raid autodetect
And for fdisk /dev/hdk i get :
Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)
So what am i doing wrong? How can i get the expected behavior? ie on
bootime a RAID5 array is created and available from /dev/md_d0
Thank you for your time
Michael Theodoulou
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