On Wed, Aug 13, 2008 at 8:05 AM, Artem Bokhan <aptem@xxxxxx> wrote: > When I run 'dd if=/dev/sda of=/dev/null skip=9700 bs=1M' and it meets bad > block, it takes about > '/sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/0000:02:02.0/host4/target4:0:0/4:0:0:0/timeout > + about 10 seconds' to determine I/O error. Until that IO to device is > locked, as I understand. I want to reduce the time of lock as much as > possible. > > dd: reading `/dev/sda': Input/output error > 240+1 records in > 240+1 records out > 252575744 bytes (253 MB) copied, 13.7833 s, 18.3 MB/s > Artem, I'm not sure what your goal is but you might find it interesting that "Enterprise" versions of some of the drives have fast fail logic built into them. ie. They don't internally retry on medium errors. As I understand it, the concept is if you have a raid setup, you don't want to waste time retrying a read. It is better to fail the read ASAP and get the data from another source. Greg -- Greg Freemyer Litigation Triage Solutions Specialist http://www.linkedin.com/in/gregfreemyer First 99 Days Litigation White Paper - http://www.norcrossgroup.com/forms/whitepapers/99%20Days%20whitepaper.pdf The Norcross Group The Intersection of Evidence & Technology http://www.norcrossgroup.com -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
