Hi all,
The Dietpi Image is a fresh one v148 on a RPi 2 Model B (armv7l).
I used the Dietpi-Drive_Manager tool to mount my 16GB kingston USB 3.0.
From time to time (~1 hour) the USB drive becomes a Read-Only file system. I cannot remount with -rw option since my dietpi_userdata is located on this drive.
I have checked /etc/fstab
#Internal Drives---------------------------------------------------
proc /proc proc defaults 0 0
/dev/mmcblk0p1 /boot auto defaults,noatime,discard 0 2
/dev/mmcblk0p2 / auto defaults,noatime,discard 0 1
tmpfs /tmp tmpfs defaults,noatime,nodev,nosuid,mode=1777 0 0
tmpfs /var/log tmpfs defaults,size=20m,noatime,nodev,nosuid,mode=1777 0 0
tmpfs /DietPi tmpfs defaults,size=10m,noatime,nodev,nosuid,mode=1777 0 0
#External Drives---------------------------------------------------
#NB: Please use dietpi-drive_manager to setup and control your external drives.
#Samba Client------------------------------------------------------
#/mnt/samba . Please use dietpi-config and the Networking Options: NAS menu to setup this mount
#FTP Client Mount--------------------------------------------------
#/mnt/ftp_client . Please use dietpi-config and the Networking Options: NAS menu to setup this mount
#NFS Client Mount--------------------------------------------------
#/mnt/nfs_client . Please use dietpi-config and the Networking Options: NAS menu to setup this mount
UUID=7b2aed01-97e1-4652-959a-6ab258fa9c86 /mnt/7b2aed01-97e1-4652-959a-6ab258fa9c86 auto defaults,noatime,nofail,x-systemd.automount,rw 0 0
# a swapfile is not a swap partition, no line here
# use dphys-swapfile swap[on|off] for that
I have specified the rw option in fstab. It doesn’st seem to clear the problem.
For some reason the Drive is mounted under “NFS Client Mount” instead of “External Drives” 
.
blkid shows:
/dev/mmcblk0p1: SEC_TYPE="msdos" LABEL="boot" UUID="64EB-FD02" TYPE="vfat" PARTUUID="ee614650-01"
/dev/mmcblk0p2: LABEL="rootfs" UUID="6e11ba37-3d23-4d99-8ad6-b6a7a5fb372d" TYPE="ext4" PARTUUID="ee614650-02"
/dev/sda1: LABEL="downloads" UUID="7b2aed01-97e1-4652-959a-6ab258fa9c86" TYPE="ext4" PARTLABEL="Microsoft Basic Data" PARTUUID="34b8b6dc-6c26-443a-9265-fdc8db500e4f"
/dev/mmcblk0: PTUUID="ee614650" PTTYPE="dos"
dmesg | grep “EXT4” shows the following:
[ 2.050076] EXT4-fs (mmcblk0p2): mounted filesystem with ordered data mode. Opts: (null)
[ 7.564817] EXT4-fs (mmcblk0p2): re-mounted. Opts: discard
[ 10.995473] EXT4-fs (sda1): recovery complete
[ 11.000548] EXT4-fs (sda1): mounted filesystem with ordered data mode. Opts: (null)
[ 1095.276873] EXT4-fs warning (device sda1): ext4_end_bio:329: I/O error -121 writing to inode 130573 (offset 8388608 size 4194304 starting block 172544)
[ 1095.329410] EXT4-fs warning (device sda1): ext4_end_bio:329: I/O error -121 writing to inode 130573 (offset 8388608 size 4194304 starting block 172800)
[ 1095.381784] EXT4-fs warning (device sda1): ext4_end_bio:329: I/O error -121 writing to inode 130573 (offset 8388608 size 4194304 starting block 173056)
[ 1095.433674] EXT4-fs warning (device sda1): ext4_end_bio:329: I/O error -121 writing to inode 130573 (offset 8388608 size 4194304 starting block 173312)
[ 1095.486001] EXT4-fs warning (device sda1): ext4_end_bio:329: I/O error -121 writing to inode 130573 (offset 83886080 size 4194304 starting block 190976)
[ 1095.538376] EXT4-fs warning (device sda1): ext4_end_bio:329: I/O error -121 writing to inode 130573 (offset 83886080 size 4194304 starting block 191232)
[ 1095.590818] EXT4-fs warning (device sda1): ext4_end_bio:329: I/O error -121 writing to inode 130573 (offset 83886080 size 4194304 starting block 191488)
[ 1095.644227] EXT4-fs warning (device sda1): ext4_end_bio:329: I/O error -121 writing to inode 130573 (offset 83886080 size 4194304 starting block 191744)
[ 1095.697113] EXT4-fs warning (device sda1): ext4_end_bio:329: I/O error -121 writing to inode 130573 (offset 98566144 size 6291456 starting block 194560)
[ 1095.749296] EXT4-fs warning (device sda1): ext4_end_bio:329: I/O error -121 writing to inode 130573 (offset 98566144 size 6291456 starting block 194816)
[ 1102.068684] EXT4-fs error (device sda1): ext4_journal_check_start:56: Detected aborted journal
[ 1102.068703] EXT4-fs (sda1): Remounting filesystem read-only
[ 1102.068716] EXT4-fs (sda1): previous I/O error to superblock detected
[ 1102.071533] EXT4-fs (sda1): ext4_writepages: jbd2_start: 6144 pages, ino 130573; err -30
This effects my downloads in Transmission.
The USB drive is fairly new and has been used for a month or so , 24/7.
I found out that rebooting the Pi solves the problem. Also, a little research on Fstab showed that adding errors=remount-rw as a mount option may solve the problem but it didn’t.
> .