From mboxrd@z Thu Jan 1 00:00:00 1970 From: hare@suse.de (Hannes Reinecke) Date: Wed, 13 Jan 2016 09:26:29 +0100 Subject: NVM and swap device In-Reply-To: <20160112194030.5b74ecdc@xeon-e3> References: <20160112194030.5b74ecdc@xeon-e3> Message-ID: <56960A35.9020507@suse.de> On 01/13/2016 04:40 AM, Stephen Hemminger wrote: > 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 > Ouch. 34 sectors is aligned to basically nothing, and is guaranteed to trip any alignment issues there are. Please repartition the device and use some sane value like 2M alignment. Cheers, Hannes -- Dr. Hannes Reinecke Teamlead Storage & Networking hare at suse.de +49 911 74053 688 SUSE LINUX GmbH, Maxfeldstr. 5, 90409 N?rnberg GF: F. Imend?rffer, J. Smithard, J. Guild, D. Upmanyu, G. Norton HRB 21284 (AG N?rnberg)