On Thu, 20 Jan 2005, Mark Bellon wrote: > I've seen this too. The worst case can actually last for over 2 minutes. > > We've been running with a patch to the RAID 1 driver that handles this > so critical applications do not hang for too long. Basically it uses > timers in the RAID 1 driver to force the disk to be treated as actually > having failed if it doesn't respond within a reasonable time (tunable > but usually ~3 seconds). It then handles the I/O requests coming back > async. and does the clean up. This is intersting, but make it an option (kernel compile, sysctl, etc.)... I have a small home server/firewall that I run with the disks spun down (noflushd) and spinning up a disk sometimes takes 8 seconds - it's a RAID-1 set and seems to cope OK with the disks spinning down & up again as required... Gordon - 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
