Ripple Server always stop with no reason

[listar]

My ripple server always stopped, I don't know the exact reason. Does anyone have the same problem here?

I choose Rocksdb, and the [ledger_history] is 10000000 ( about one year's data).

Here is my rippled.cnf:

[server]
port_rpc_admin_local
port_peer
port_ws_admin_local
#port_ws_public
#ssl_key = /etc/ssl/private/server.key
#ssl_cert = /etc/ssl/certs/server.crt

[port_rpc_admin_local]
port = 5005
ip = 127.0.0.1
admin = 127.0.0.1
protocol = http

[port_peer]
port = 51235
ip = 0.0.0.0
protocol = peer

[port_ws_admin_local]

port = 6006
ip = 127.0.0.1
admin = 127.0.0.1
protocol = ws

#[port_ws_public]
#port = 5005
#ip = 127.0.0.1
#protocol = wss

#-------------------------------------------------------------------------------

[node_size]
huge

# This is primary persistent datastore for rippled.  This includes transaction
# metadata, account states, and ledger headers.  Helpful information can be
# found here: https://ripple.com/wiki/NodeBackEnd
# delete old ledgers while maintaining at least 2000. Do not require an
# external administrative command to initiate deletion.
[node_db]
type=RocksDB
path=/mnt/ripple/db/rocksdb
open_files=2000
filter_bits=12
cache_mb=256
file_size_mb=8
file_size_mult=2

online_delete=10000000
advisory_delete=0

[ledger_history]
# How many ledgers do we want to keep (history)?
# Integer value (ledger count)
# or (if you have lots of TB SSD storage): 'full'
10000000

# This is the persistent datastore for shards. It is important for the health
# of the ripple network that rippled operators shard as much as practical.
# NuDB requires SSD storage. Helpful information can be found here
# https://ripple.com/build/history-sharding
#[shard_db]
#type=NuDB
#path=/var/lib/rippled/db/shards/nudb
#max_size_gb=500

[database_path]
/mnt/ripple/db

# This needs to be an absolute directory reference, not a relative one.
# Modify this value as required.
[debug_logfile]
/var/log/rippled/debug.log

[sntp_servers]
time.windows.com
time.apple.com
time.nist.gov
pool.ntp.org

# Where to find some other servers speaking the Ripple protocol.
[ips]
r.ripple.com 51235
169.55.164.20 51235
169.54.2.154 51235
s2.ripple.com 51235
#198.11.206.11 51235
#50.22.123.222 51235

# To use the XRP test network (see https://ripple.com/build/xrp-test-net/),
# use the following [ips] section instead:

# [ips]
# r.altnet.rippletest.net 51235

# File containing trusted validator keys or validator list publishers.
# Unless an absolute path is specified, it will be considered relative to the
# folder in which the rippled.cfg file is located.
[validators_file]
validators.txt

# Turn down default logging to save disk space in the long run.
# Valid values here are trace, debug, info, warning, error, and fatal
[rpc_startup]
{ "command": "log_level", "severity": "warning" }

# If ssl_verify is 1, certificates will be validated.
# To allow the use of self-signed certificates for development or internal use,
# set to ssl_verify to 0.
[ssl_verify]
0

BTW, is the high IOPS (SSD) a must? What if I using sata?

Please help me out of here. Thank you all!