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InnoDB: Operating system error number 24 in a file operation... again

astast EntrantCurrent User Role Beginner
Hi Guys.

Seen this asked before many times and have followed advice and guidance but at a complete loss with this. I have followed the settings to the letter as set out at https://www.percona.com/blog/2016/12/28/using-percona-xtrabackup-mysql-instance-large-number-tables/

Running 'find /var/lib/mysql/ -name "*.ibd" | wc -l' returns 8338 so setting my limits of 2000000 seem really excessive.

my.cnf (have **** out the wsrep_cluster_address, wsrep_sst_auth and wsrep_node_address)

binlog_format = ROW
innodb_buffer_pool_size = 2G
innodb_flush_log_at_trx_commit = 0
innodb_flush_method = O_DIRECT
innodb_log_files_in_group = 2
innodb_log_file_size = 20M
innodb_file_per_table = 1
transaction-isolation = READ-COMMITTED
max_connections = 100

wsrep_cluster_address = ********************
wsrep_provider = /usr/lib64/libgalera_smm.so
wsrep_sst_auth = ***********************
wsrep_slave_threads = 8
wsrep_cluster_name = pptdrupalcluster
wsrep_node_address = *********************
wsrep_node_name = Node2
wsrep_sst_method = xtrabackup-v2
default_storage_engine = InnoDB
datadir = /var/lib/mysql
open_files_limit = 2000000

log_slave_updates
innodb_locks_unsafe_for_binlog = 1
innodb_autoinc_lock_mode = 2

[mysqld_safe]
pid-file = /run/mysqld/mysql.pid
syslog


My systems open file hard limit is set to 2000000 as well.

Excerpt of /etc/security/limits.conf

mysql hard nofile 2000000
mysql soft nofile 2000000

ulimit -a
core file size (blocks, -c) 0
data seg size (kbytes, -d) unlimited
scheduling priority (-e) 0
file size (blocks, -f) unlimited
pending signals (-i) 31209
max locked memory (kbytes, -l) 64
max memory size (kbytes, -m) unlimited
open files (-n) 1024
pipe size (512 bytes, -p) 8
POSIX message queues (bytes, -q) 819200
real-time priority (-r) 0
stack size (kbytes, -s) 8192
cpu time (seconds, -t) unlimited
max user processes (-u) 31209
virtual memory (kbytes, -v) unlimited
file locks (-x) unlimited

Is there something else I'm missing with this?

Thanks
AST

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