From mboxrd@z Thu Jan 1 00:00:00 1970 From: stephen@networkplumber.org (Stephen Hemminger) Date: Tue, 12 Jan 2016 19:40:30 -0800 Subject: NVM and swap device Message-ID: <20160112194030.5b74ecdc@xeon-e3> I have a nice shiny new Intel NVM PCI card; decided to use it for a filesystem and swap. The filesystem (btrfs) is doing fine, but the swap device was throwing occasional random errors. Suspect a driver problem rather than hardware. I am using 4.4 kernel without patches. kern.log:Jan 12 08:11:57 xeon-e3 kernel: [159474.037390] Read-error on swap-device (259:0:17597808) kern.log.1:Jan 7 08:32:10 xeon-e3 kernel: [87938.855526] Read-error on swap-device (259:0:11355648) kern.log.1:Jan 7 08:32:10 xeon-e3 kernel: [87938.855530] Read-error on swap-device (259:0:11355656) kern.log.1:Jan 7 08:32:10 xeon-e3 kernel: [87939.855467] Read-error on swap-device (259:0:16180824) kern.log.1:Jan 8 08:24:07 xeon-e3 kernel: [63670.777981] Read-error on swap-device (259:0:32690768) kern.log.1:Jan 9 09:25:02 xeon-e3 kernel: [153720.919325] Read-error on swap-device (259:0:220488) kern.log.1:Jan 9 16:40:05 xeon-e3 kernel: [179820.957675] Read-error on swap-device (259:0:24476232) kern.log.1:Jan 9 16:40:05 xeon-e3 kernel: [179820.962673] Read-error on swap-device (259:0:33292816) The swap device was being added via /etc/fstab by UUID. I gave up and went back to spinning rust for swap device for stabilty. Device partitions are: Disk /dev/nvme0n1: 781422768 sectors, 372.6 GiB Logical sector size: 512 bytes Disk identifier (GUID): 304117A4-18EF-4B51-92F4-8015758B5CB0 Partition table holds up to 128 entries First usable sector is 34, last usable sector is 781422734 Partitions will be aligned on 8-sector boundaries Total free space is 0 sectors (0 bytes) Number Start (sector) End (sector) Size Code Name 1 34 2047 1007.0 KiB EF02 BIOS boot partition 2 2048 33556479 16.0 GiB 8200 Linux swap 3 33556480 781422734 356.6 GiB 8300 Linux filesystem