On 1/1/2014 12:00 PM, Tomas M wrote: >> Your initial post suggested you knew which drive was flaky. Now you >> indicate you don't know which, if any, is flaky. This suggests you have >> no idea why your array is slow. > > Well, I always have an indication which drive is flaky, based on dmesg > output (e.g. hard resetting ATA3 link, etc). However, sometimes it > reports that more than one drive has problems [snip] Full stop. Random resets on multiple links indicates a backplane (if present), HBA/controller, or cable problem, not a drive problem. If you're using an HBA+backplane with an SFF-8087 4x multilane cable, or a breakout cable, the problem could be as simple as a lose connection at the SFF-8087 multilane connector, or a cable gone bad. If you have multiple discrete SATA cables, one per drive, this indicates a problem with the controller/HBA. Ergo, if you have a multilane cable, unplug/replug it and see if that helps. If not, replace it. If that doesn't solve the problem, replace the HBA. If replacing the HBA doesn't solve it, replace the backplane. If you have discrete cables, replacing the HBA should fix the problem. If you have discrete cables and are using motherboard SATA ports, you'll need to acquire an HBA and cease using the motherboard ports. -- Stan -- 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
