Unable to access accounts hash cache path: source(create_dir_all) - I/O error: Permission denied (os error 13), file: /mnt/ledger/accounts_hash_cache

Question

Getting this error:

Unable to access accounts hash cache path: source(create_dir_all) - I/O error: Permission denied (os error 13), file: /mnt/ledger/accounts_hash_cache

While trying to run a testnet solana validator on a cgp instance. I have an SSD with 2TB for the ledge, one with 500GB for the accounts, i've followed the guide from:

https://docs.solana.com/validator/get-started/setup-a-validator

That's my validator.sh:

exec solana-validator \
    --identity validator-keypair.json \
    --vote-account vote-account-keypair.json \
    --known-validator 5D1fNXzvv5NjV1ysLjirC4WY92RNsVH18vjmcszZd8on \
    --known-validator 7XSY3MrYnK8vq693Rju17bbPkCN3Z7KvvfvJx4kdrsSY \
    --known-validator Ft5fbkqNa76vnsjYNwjDZUXoTWpP7VYm3mtsaQckQADN \
    --known-validator 9QxCLckBiJc783jnMvXZubK4wH86Eqqvashtrwvcsgkv \
    --only-known-rpc \
    --log /home/sol/solana-validator.log \
    --ledger /mnt/ledger \
    --accounts /mnt/accounts \
    --rpc-port 8899 \
    --dynamic-port-range 8000-8020 \
    --entrypoint entrypoint.testnet.solana.com:8001 \
    --entrypoint entrypoint2.testnet.solana.com:8001 \
    --entrypoint entrypoint3.testnet.solana.com:8001 \
    --expected-genesis-hash 4uhcVJyU9pJkvQyS88uRDiswHXSCkY3zQawwpjk2NsNY \
    --wal-recovery-mode skip_any_corrupted_record \
    --limit-ledger-size

My disks:

NAME    MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
sda       8:0    0   10G  0 disk 
├─sda1    8:1    0  9.9G  0 part /
├─sda14   8:14   0    3M  0 part 
└─sda15   8:15   0  124M  0 part /boot/efi
sdb       8:16   0    2T  0 disk /mnt/ledger
sdc       8:32   0  500G  0 disk /mnt/accounts

Answer 1

The user starting the validator doesn't have access to the directory in question.

Did you maybe forget to run this command? sudo chown -R sol:sol /mnt/ledger

Answer 2

The chown has to happen after the mount. Try this -

You have to mount the drive first:

sudo mount /dev/sdb /mnt/ledger

Then change the ownership of the directory to your sol user:

sudo chown -R sol:sol /mnt/ledger

You have to do the above from the admin/main user. You can do the same for /mnt/accounts also but be sure to change the mount point.

Also doing just this won't be enough. You want to make sure thats in fstab too or it wont get mounted if the node reboots. You can try this -

/dev/sdb    /mnt/ledger    ext4    defaults    0    1
/dev/sdc    /mnt/accounts  ext4    defaults    0    1