Hi all, I was using rsync to copy a very large file (95GB kvm Linux host image) on the same filesystem to make a backup, and it was taking a much longer time than it should have. The system was otherwise completely idle. The time, as shown from --progress, would fluctuate from 50 minutes to three hours, and never really settle on a steady time. It would copy between 8MB/s and 30MB/s during the copy. The kvm image was on a RAID5 filesystem with three disks, all the same. iostat would show it was reading about 20MB/s then would go to nearly 0, then back to 20MB/s, and also would show that the transfer speed would fluctuate. Is this to be expected? It got me thinking that the disks are a few years old now, and perhaps are on the verge of failure? I'm not sure I can properly interpret the SMART output, though. It passed a short test, but the disks have 18439 hours on them! Here is the SMART output for one of the disks: http://pastebin.com/vnnAvbrD It appears to show quite a few errors, but none of them have exceeded the threshold: 7 Seek_Error_Rate 0x000f 085 060 030 Pre-fail Always - 354385893 Does hardware ECC affect performance? 195 Hardware_ECC_Recovered 0x001a 071 053 000 Old_age Always - 209030577 Thanks for any ideas. Best, Alex -- To unsubscribe from this list: send the line "unsubscribe linux-admin" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
