Roman Mamedov (rm@xxxxxxxxxxx) wrote on Thu, Mar 03, 2016 at 11:30:26AM BRT: > Let's suppose I am seeing slow write performance on a RAID5 or RAID6, and I am > suspecting that it's because of one of its devices operating slower than > others (maybe a soft-failing or just low-performing hard drive, in case with > non-identical member drives). Nothing in dmesg, no timeouts or ATA errors or > anything like that. > > How would I go about diagnosing which device that is (if any) is slowing down > the array, aside from performance-testing each individual device (which seems > rather difficult if it's only slow on writes, not reads). I use sar -d -p 5 |grep -v md -- 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
