Hello again Task completed, I see in three occurrence of this event: [518366.156963] INFO: task btrfs-cleaner:1034 blocked for more than 120 seconds. [518366.156989] Not tainted 5.5.3-050503-generic #202002110832 [518366.157024] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [518366.157044] btrfs-cleaner D 0 1034 2 0x80004000 [518366.157054] Call Trace: [518366.157082] __schedule+0x2d8/0x760 [518366.157094] schedule+0x55/0xc0 [518366.157105] schedule_preempt_disabled+0xe/0x10 [518366.157113] __mutex_lock.isra.0+0x182/0x4f0 [518366.157125] __mutex_lock_slowpath+0x13/0x20 [518366.157132] mutex_lock+0x2e/0x40 [518366.157261] btrfs_delete_unused_bgs+0xc0/0x560 [btrfs] [518366.157322] ? __wake_up+0x13/0x20 [518366.157424] cleaner_kthread+0x124/0x130 [btrfs] [518366.157437] kthread+0x104/0x140 [518366.157531] ? kzalloc.constprop.0+0x40/0x40 [btrfs] [518366.157565] ? kthread_park+0x90/0x90 [518366.157575] ret_from_fork+0x35/0x40 and [518486.984177] INFO: task btrfs-cleaner:1034 blocked for more than 241 seconds. [518486.984204] Not tainted 5.5.3-050503-generic #202002110832 [518486.984216] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [518486.984233] btrfs-cleaner D 0 1034 2 0x80004000 [518486.984243] Call Trace: [518486.984271] __schedule+0x2d8/0x760 [518486.984284] schedule+0x55/0xc0 [518486.984295] schedule_preempt_disabled+0xe/0x10 [518486.984305] __mutex_lock.isra.0+0x182/0x4f0 [518486.984319] __mutex_lock_slowpath+0x13/0x20 [518486.984326] mutex_lock+0x2e/0x40 [518486.984451] btrfs_delete_unused_bgs+0xc0/0x560 [btrfs] [518486.984464] ? __wake_up+0x13/0x20 [518486.984562] cleaner_kthread+0x124/0x130 [btrfs] [518486.984573] kthread+0x104/0x140 [518486.984666] ? kzalloc.constprop.0+0x40/0x40 [btrfs] [518486.984675] ? kthread_park+0x90/0x90 [518486.984686] ret_from_fork+0x35/0x40 and [518728.646379] INFO: task btrfs-cleaner:1034 blocked for more than 120 seconds. [518728.646413] Not tainted 5.5.3-050503-generic #202002110832 [518728.646428] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [518728.646447] btrfs-cleaner D 0 1034 2 0x80004000 [518728.646460] Call Trace: [518728.646494] __schedule+0x2d8/0x760 [518728.646508] schedule+0x55/0xc0 [518728.646522] schedule_preempt_disabled+0xe/0x10 [518728.646534] __mutex_lock.isra.0+0x182/0x4f0 [518728.646550] __mutex_lock_slowpath+0x13/0x20 [518728.646559] mutex_lock+0x2e/0x40 [518728.646719] btrfs_delete_unused_bgs+0xc0/0x560 [btrfs] [518728.646735] ? __wake_up+0x13/0x20 [518728.646859] cleaner_kthread+0x124/0x130 [btrfs] [518728.646875] kthread+0x104/0x140 [518728.647019] ? kzalloc.constprop.0+0x40/0x40 [btrfs] [518728.647031] ? kthread_park+0x90/0x90 [518728.647045] ret_from_fork+0x35/0x40 Is it a kind of normal? Thanks, bye Il giorno lun 17 feb 2020 alle ore 15:12 Menion <menion@xxxxxxxxx> ha scritto: > > ok thanks > I have launched it (in a tmux session), after 5 minutes the command > did not return yet, but dmesg and btrfs balance status > /array/mount/point report it in progress (0%). > Is it normal? > > Il giorno lun 17 feb 2020 alle ore 14:55 Swâmi Petaramesh > <swami@xxxxxxxxxxxxxx> ha scritto: > > > > On 2020-02-17 14:50, Menion wrote: > > > Is it ok to run it on a mounted filesystem with concurrent read and > > > write operations? > > > > Yes. Please check man btrfs-balance. > > > > All such BTRFS operations are to be run on live, mounted filesystems. > > > > Performance will suffer and it might be long though. > > > > > Also, since the number of HDD is 5, how this "raid1" scheme is deployed? > > > > BTRFS will manage storing 2 copies of every metadata block on 2 > > different disks, and will choose how by itself. > > > > ॐ > > > > -- > > Swâmi Petaramesh <swami@xxxxxxxxxxxxxx> PGP 9076E32E > >
