On Tuesday November 15, raziebe@xxxxxxxxx wrote: > > mdadm --add /dev/md0 /dev/sda2.. > yes , i am using raidstart for this. it should be the same. No, it shouldn't. raidstart is broken by design and cannot work reliable. It is one of the main reasons that I wrote mdadm. raidstart trusts the device numbers (major and minor) that are stored in the superblock. If you pull a drive out these numbers change and raidstart fails miserably. # rm -f /usr/sbin/raidstart is probably a good idea. > I am handling a big cluster with supermicro machines,each machine has its > own 4 sata disks.I am using 2.6.6 kernel. > > Did you ever pulled out a disk from raid5 while the machine was > running ? Yes, several times. NeilBrown - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html