# Inaccessible “/var/lib/scylla” and “/var/lib/systemd/coredump” after ScyllaDB upgrade

## Problem

When you reboot the machine after a ScyllaDB upgrade, you cannot access data directories under `/var/lib/scylla`, and
coredump saves to `rootfs`.

The problem may occur when you upgrade ScylaDB Open Source 4.6 or later to a version of ScyllaDB Enterprise if
the `/etc/systemd/system/var-lib-scylla.mount` and `/etc/systemd/system/var-lib-systemd-coredump.mount` are
deleted by RPM.

To avoid losing the files, the upgrade procedure includes a step to backup the .mount files. The following
example shows the command to backup the files before the upgrade from version 5.0:

```console
for conf in $( rpm -qc $(rpm -qa | grep scylla) | grep -v contains ) /etc/systemd/system/{var-lib-scylla,var-lib-systemd-coredump}.mount; do sudo cp -v $conf $conf.backup-5.0; done
```

If you don’t backup the .mount files before the upgrade, the files may be lost.

## Solution

If you didn’t backup the .mount files before the upgrade and the files were deleted during the upgrade,
you need to restore them manually.

To restore `/etc/systemd/system/var-lib-systemd-coredump.mount`, run the following:

```console
$ cat << EOS | sudo tee /etc/systemd/system/var-lib-systemd-coredump.mount
[Unit]
Description=Save coredump to scylla data directory
Conflicts=umount.target
Before=scylla-server.service
After=local-fs.target
DefaultDependencies=no
[Mount]
What=/var/lib/scylla/coredump
Where=/var/lib/systemd/coredump
Type=none
Options=bind
[Install]
WantedBy=multi-user.target
EOS
```

To restore `/etc/systemd/system/var-lib-scylla.mount`, run the following (specifying your data disk):

```console
$ UUID=`blkid -s UUID -o value <specify your data disk, eg: /dev/md0>`
$ cat << EOS | sudo tee /etc/systemd/system/var-lib-scylla.mount
[Unit]
Description=ScyllaDB data directory
Before=scylla-server.service
After=local-fs.target
DefaultDependencies=no
[Mount]
What=/dev/disk/by-uuid/$UUID
Where=/var/lib/scylla
Type=xfs
Options=noatime
[Install]
WantedBy=multi-user.target
EOS
```

After restoring .mount files, you need to enable them:

```console
$ sudo systemctl daemon-reload
$ sudo systemctl enable --now var-lib-scylla.mount
$ sudo systemctl enable --now var-lib-systemd-coredump.mount
```

[Troubleshoot](https://docs.scylladb.com/manual/branch-2025.1/troubleshooting/index.md)