I'm not certain if I'm having the same trouble as you, but mdadm fell over pretty hard for me on 2.6.24-16-server, mdadm - v2.6.3 - 20th August 2007 when expanding 5x500GB -> 6x500GB. I lost all the data on the raid (oops).
Possibly this is a bug in sata_sil with lots of disk writes? 5 of the 6 disks were on siI 3512 based SATA cards (The other was an onboard mobo SATA port). Similarly, I can write to the disks individually fine, they check out okay with badblocks and smartctl.
Did you get any weirdness in dmesg? I had a couple of odd things about the SATA link going down... so possibly unrelated.
I'm not certain if I'm having the same trouble as you, but mdadm fell over pretty hard for me on 2.6.24-16-server, mdadm - v2.6.3 - 20th August 2007 when expanding 5x500GB -> 6x500GB. I lost all the data on the raid (oops).
Possibly this is a bug in sata_sil with lots of disk writes? 5 of the 6 disks were on siI 3512 based SATA cards (The other was an onboard mobo SATA port). Similarly, I can write to the disks individually fine, they check out okay with badblocks and smartctl.
Did you get any weirdness in dmesg? I had a couple of odd things about the SATA link going down... so possibly unrelated.