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Date: Mon, 29 Jul 2019 14:18:22 +0300 From: Dmitrij Gusev <dmitrij@...ev.co> To: "'linux-ext4@...r.kernel.org'" <linux-ext4@...r.kernel.org> Cc: 'Theodore Ts'o' <tytso@....edu> Subject: ext4 file system is constantly writing to the block device with no activity from the applications, is it a bug? Hello. A ext4 file system is constantly writing to the block device with no activity from the applications, is it a bug? Write speed is about 64k bytes (almost always exactly 64k bytes) per second every 1-2 seconds (I've discovered it after a RAID sync finished). Please the check activity log sample below. I could not find out which process was writing constantly, so I rebooted to a rescue mode and mounted FS with no activity guaranteed - the same activity has started about at 64kB/s every 1-2 seconds. The file system was created with the latest e2fsprogs, here are the details: Linux nexus 4.19.62 #2 SMP Sun Jul 28 17:18:10 CDT 2019 x86_64 AMD Athlon(tm) Dual Core Processor 5050e AuthenticAMD GNU/Linux # tune2fs -l /dev/<XXXXXXvg>/home tune2fs 1.43.1 (08-Jun-2016) // file system was created in other system with the latest version tools Filesystem volume name: home Last mounted on: /home Filesystem UUID: XXXXXXXXXXXXXXXXXX Filesystem magic number: 0xEF53 Filesystem revision #: 1 (dynamic) Filesystem features: has_journal ext_attr resize_inode dir_index filetype needs_recovery extent 64bit flex_bg sparse_super large_file huge_file dir_nlink extra_isize metadata_csum Filesystem flags: signed_directory_hash Default mount options: user_xattr acl Filesystem state: clean Errors behavior: Continue Filesystem OS type: Linux Inode count: 21644032 Block count: 2770432000 Reserved block count: 0 Free blocks: 2095699032 Free inodes: 21205431 First block: 0 Block size: 4096 Fragment size: 4096 Group descriptor size: 64 Reserved GDT blocks: 726 Blocks per group: 32768 Fragments per group: 32768 Inodes per group: 256 Inode blocks per group: 16 RAID stride: 128 RAID stripe width: 384 Flex block group size: 16 Filesystem created: Sat Jul 27 16:41:21 2019 Last mount time: Mon Jul 29 13:47:33 2019 Last write time: Mon Jul 29 13:47:33 2019 Mount count: 10 Maximum mount count: -1 Last checked: Sat Jul 27 16:41:21 2019 Check interval: 0 (<none>) Lifetime writes: 2615 GB Reserved blocks uid: 0 (user root) Reserved blocks gid: 0 (group root) First inode: 11 Inode size: 256 Required extra isize: 32 Desired extra isize: 32 Journal inode: 8 Default directory hash: half_md4 Directory Hash Seed: XXXXXXXXXXXXXXXXXXXXXXX Journal backup: inode blocks Checksum type: crc32c Checksum: 0x7f0fb170 BlockDev Activity log: # iostat -kdt 1 /dev/XXXXXXvg/home Linux 4.19.62 (XXXXX) 07/29/2019 _x86_64_ (2 CPU) 07/29/2019 02:08:03 PM Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn dm-5 1.91 15.40 37.77 19309 47364 07/29/2019 02:08:04 PM Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn dm-5 1.00 0.00 64.00 0 64 07/29/2019 02:08:05 PM Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn dm-5 1.00 0.00 64.00 0 64 07/29/2019 02:08:06 PM Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn dm-5 0.00 0.00 0.00 0 0 07/29/2019 02:08:07 PM Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn dm-5 1.00 0.00 64.00 0 64 07/29/2019 02:08:08 PM Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn dm-5 0.00 0.00 0.00 0 0 07/29/2019 02:08:09 PM Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn dm-5 1.00 0.00 64.00 0 64 07/29/2019 02:08:10 PM Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn dm-5 1.00 0.00 64.00 0 64 07/29/2019 02:08:11 PM Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn dm-5 0.00 0.00 0.00 0 0 07/29/2019 02:08:12 PM Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn dm-5 1.00 0.00 64.00 0 64 07/29/2019 02:08:13 PM Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn dm-5 0.00 0.00 0.00 0 0 07/29/2019 02:08:14 PM Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn dm-5 1.00 0.00 64.00 0 64 07/29/2019 02:08:15 PM Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn dm-5 1.00 0.00 64.00 0 64 07/29/2019 02:08:16 PM Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn dm-5 0.00 0.00 0.00 0 0 07/29/2019 02:08:17 PM Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn dm-5 1.00 0.00 64.00 0 64 07/29/2019 02:08:18 PM Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn dm-5 0.00 0.00 0.00 0 0 07/29/2019 02:08:19 PM Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn dm-5 1.00 0.00 64.00 0 64 07/29/2019 02:08:20 PM Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn dm-5 1.00 0.00 64.00 0 64 07/29/2019 02:08:21 PM Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn dm-5 0.00 0.00 0.00 0 0 07/29/2019 02:08:22 PM Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn dm-5 1.00 0.00 64.00 0 64 07/29/2019 02:08:23 PM Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn dm-5 0.00 0.00 0.00 0 0 07/29/2019 02:08:24 PM Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn dm-5 1.00 0.00 64.00 0 64 Thank you, --- Dmitrij Gusev Systems architect
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