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jbd2/md2-8 and jbd2/md3-8 slowing down everything
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jbd2/md2-8 and jbd2/md3-8 slowing down everything

xrzxrz Member
edited September 2016 in Help

host at soyoustart, is there a way to get this jbd out or limit it somehow? i tried nice, renice, io limit, cpu % limit, nothng works :/

root@root:~# cat /proc/mdstat
Personalities : [linear] [raid0] [raid1] [raid10] [raid6] [raid5] [raid4] [multipath] [faulty]
md2 : active raid1 sdb2[1] sda2[0]
71678912 blocks [2/2] [UU]

md3 : active raid0 sdb3[1] sda3[0]
5716114432 blocks 512k chunks

unused devices:

Total DISK READ : 31.33 K/s | Total DISK WRITE : 1691.75 K/s
Actual DISK READ: 125.31 K/s | Actual DISK WRITE: 2.03 M/s
TID PRIO USER DISK READ DISK WRITE SWAPIN IO> COMMAND
3378 be/7 root 0.00 B/s 46.99 K/s 0.00 % 68.28 % [jbd2/md3-8]
259 be/3 root 0.00 B/s 86.15 K/s 0.00 % 51.15 % [jbd2/md2-8]

root@root:~# iotop -obtqqq | grep jbd2
12:08:04 259 be/3 root 0.00 B/s 0.00 B/s 0.00 % 49.59 % [jbd2/md2-8]
12:08:04 3378 be/7 root 0.00 B/s 0.00 B/s 0.00 % 27.92 % [jbd2/md3-8]
12:08:05 3378 be/7 root 0.00 B/s 0.00 B/s 0.00 % 99.99 % [jbd2/md3-8]
12:08:05 259 be/3 root 0.00 B/s 3.92 K/s 0.00 % 19.61 % [jbd2/md2-8]
12:08:06 3378 be/7 root 0.00 B/s 0.00 B/s 0.00 % 85.54 % [jbd2/md3-8]
12:08:06 259 be/3 root 0.00 B/s 0.00 B/s 0.00 % 24.82 % [jbd2/md2-8]

root@root:~# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/root 68G 7.7G 57G 12% /
devtmpfs 32G 0 32G 0% /dev
tmpfs 32G 0 32G 0% /dev/shm
tmpfs 32G 731M 31G 3% /run
tmpfs 5.0M 0 5.0M 0% /run/lock
tmpfs 32G 0 32G 0% /sys/fs/cgroup
/dev/md3 5.3T 753G 4.3T 15% /home
tmpfs 6.3G 0 6.3G 0% /run/user/0

everything slowed down but before it was okey

Comments

  • for real?

    tune2fs -O ^has_journal /dev/md3

    probably requires to be unmounted and do a fsck afterwards

    e2fsck -f /dev/md3

    guessing md2 to be your root / it may be required to boot to rescue for doing the same on it.

    raid0 without journaling. living on the edge. don't forget to turn writeback on also!

    tune2fs -o journal_data_writeback /dev/md3

    hopefully this makes sure your data are gone in case of an unexpected reboot or power loss.

    or simply switch to something like xfs

    apt-get install xfsprogs && mkfs.xfs -f /dev/md3

    Thanked by 1xrz
  • exception0x876exception0x876 Member, Host Rep, LIR

    or try increasing journal commit interval instead.. still better than running without a journal

    Thanked by 1xrz
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