** Description changed: After each system boot, iostat -m shows that the kernel has written around 16 GB to SSD disk: avg-cpu: %user %nice %system %iowait %steal %idle - 9.10 0.00 10.06 2.38 0.00 78.47 + 9.10 0.00 10.06 2.38 0.00 78.47 Device: tps MB_read/s MB_wrtn/s MB_read MB_wrtn sda 702.32 16.91 1495.65 182 16108 dm-0 808.36 15.64 1495.65 168 16108 dm-1 786.82 15.39 0.01 165 0 dm-2 10.21 0.21 1495.64 2 16107 - It's a fresh Ubuntu 17.04 installation with rootfs installed on LUKS. + It's a fresh Ubuntu 17.04 installation with rootfs installed on + encrypted LVM (selected during the installation). /proc/diskstats (https://www.kernel.org/doc/Documentation/ABI/testing /procfs-diskstats) seem to be matching the output of "iostat -m". - Please note that dm-2 is 16 GB swap (the system has 16 GB RAM): $ ls /dev/mapper/ -l total 0 crw------- 1 root root 10, 236 Apr 30 01:53 control lrwxrwxrwx 1 root root 7 Apr 30 01:53 sda3_crypt -> ../dm-0 lrwxrwxrwx 1 root root 7 Apr 30 01:53 ubuntu--vg-root -> ../dm-1 lrwxrwxrwx 1 root root 7 Apr 30 01:53 ubuntu--vg-swap_1 -> ../dm-2 - - $ cat /proc/swaps + $ cat /proc/swaps Filename Type Size Used Priority /dev/dm-2 partition 16494588 0 -1 - - So what seems to happen, is that the OS overwrites the whole encrypted swap partition during bootup. + So what seems to happen, is that the OS overwrites the whole encrypted + swap partition during bootup. This is very worrying, given that it's SSD disk! ProblemType: Bug DistroRelease: Ubuntu 17.04 Package: systemd 232-21ubuntu3 Uname: Linux 4.11.0-041100rc7-generic x86_64 ApportVersion: 2.20.4-0ubuntu4 Architecture: amd64 Date: Sun Apr 30 01:57:04 2017 ExecutablePath: /lib/systemd/systemd InstallationDate: Installed on 2017-04-14 (15 days ago) InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412) Lsusb: - Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub - Bus 001 Device 002: ID 093a:2510 Pixart Imaging, Inc. Optical Mouse - Bus 001 Device 003: ID 1bcf:2b95 Sunplus Innovation Technology Inc. - Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub + Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub + Bus 001 Device 002: ID 093a:2510 Pixart Imaging, Inc. Optical Mouse + Bus 001 Device 003: ID 1bcf:2b95 Sunplus Innovation Technology Inc. + Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub MachineType: Dell Inc. Precision 5520 ProcEnviron: - TERM=linux - PATH=(custom, no user) + TERM=linux + PATH=(custom, no user) ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.11.0-041100rc7-generic root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7 SourcePackage: systemd UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 03/29/2017 dmi.bios.vendor: Dell Inc. dmi.bios.version: 1.2.4 dmi.board.name: 0GPNW9 dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 10 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvr1.2.4:bd03/29/2017:svnDellInc.:pnPrecision5520:pvr:rvnDellInc.:rn0GPNW9:rvrA00:cvnDellInc.:ct10:cvr: dmi.product.name: Precision 5520 dmi.sys.vendor: Dell Inc.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1687212 Title: ~16 GB written to disk from power on till lightdb login screen? To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1687212/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs