Here is one more log with crash information. All of my disks are 
1.5TB, Seagates and WD. The expander did not affect the crashes, i had 
the same issues with direct attached drives.


On 6/6/2010 3:13 μμ, Jelle de Jong wrote:
> Dear Srini,
>
> I spent a few weeks catering information and did some intensive
> testing the last few days.
>
> Srinivas Naga Venkatasatya Pasagadugula wrote, on 06-05-10 08:01:
>> 1. Is this is the problem with only WD SATA drives? (I don't have WD SATA drives to reproduce this issue.)
>> 2. Whether the problem is with direct attached SATA drives or drives connected in expanders also?
>> 3. Could you please provide me the "dmesg" log or "/var/log/messages" log.
>> 4. How much the capacity of SATA drives connected to controller?
>> 5. Your HBA is having 6440 chipset?
> With a few tricks I managed to boot my OS from the mvsas controller. I
> got eleven different sata disks attached from a 4-port mini-sas
> backplate without expander to the two Marvel 88SE63xx/64xx mvsas
> controllers in my system.
>
> I managed to add five mdadm raid1 arrays without added the actual
> active sync device (so one disk for each array) I build my lvm systems
> on top of this and did a lot of file transfers for testing.
>
> This worked stable enough, there are HDIO_GET_IDENTITY errors during
> boot and operation, but the hard disks seem to be working.
>
> So to debug if issues are related to some brand of harddisk, I started
> to add WDC, Hitachi, SAMSUNG, Maxtor and Seagate disks to the
> respected raid1 array, the disks are of different sizes (320GB, 500GB,
> 1TB.)
>
> The sync starts and will fail directly or a while later on failures in
> the mvsas driver. I attached an failure example as attachment.
>
> The failures are of grave severity, I have lost complete lvm2 volumes
> and raid arrays during testing.
>
> Do you also have a SuperMicro AOC-SASLP-MV8 controller for testing?
>
> I would love to use the controllers for production, but they are
> currently unstable. I hope this information helps to solve the mvsas
> issues?
>
> With kind regards,
>
> Jelle de Jong