mariadb高磁盘IO和IO等待

问题描述

我们在PR和DR上分别拥有两个mariadb服务器主服务器和从服务器，我们观察到高磁盘io高于90％，iowait高于20的某个时间，当mariadb备份在晚上开始时iowait超过30且系统变得无响应导致监视处理超时并重新启动mariadb。运行dd命令时 须藤dd if = / dev / zero of = / data / test2.img bs = 512 count = 1000 oflag = dsync 它以300至500 Kb / s的速度写入数据，我们也检查了存储级别，但是在存储级别上没有发现问题，因为其他DB（Oracle）使用了相同的存储，并且那里也没有此类IO问题。我需要帮助来确定这个问题。 以下是mariadb的server.cnf

[mysqld]
symbolic_links = 0
local_infile = 0
basedir = /usr
datadir = /data/mdb_data
pid_file = /var/lib/mysql/mysqld.pid
log_error = /var/log/mariadb/mysqld.log
bind-address = ::
port = 3306
userstat = 1
plugin-load-add = server_audit=server_audit.so
server_audit = FORCE_PLUS_PERMANENT
server_audit_logging = on
server_audit_events = CONNECT,QUERY_DCL,QUERY_DDL
server_audit_output_type = syslog
cracklib_password_check = off
log_bin_trust_function_creators = 1
lower_case_table_names = 1
character-set-server = utf8
init_connect = SET NAMES utf8
innodb_file_per_table = 1
innodb_flush_log_at_trx_commit = 1
skip-name-resolve
innodb_autoinc_lock_mode = 2
max_connections = 3000
innodb_buffer_pool_size = 58G
innodb_buffer_pool_instances = 8
innodb_log_file_size = 1024m
key_buffer_size = 16M
log-error = /var/log/mariadb/mysqld.log
skip-external-locking
slow_query_log = on
long_query_time = 1
slow_query_log_file = /var/log/mariadb/slowSQLs.log
performance_schema = on
innodb_flush_method = O_DIRECT
sync_binlog = 1
max_allowed_packet = 512m
slave_max_allowed_packet = 200m
innodb_read_io_threads = 32
innodb_write_io_threads = 32
innodb_io_capacity = 600
slave_parallel_threads = 50
slave_parallel_max_queued = 2097152
slave_parallel_mode = optimistic
rpl_semi_sync_master_enabled = 0
rpl_semi_sync_slave_enabled = 1
rpl_semi_sync_master_wait_point = AFTER_SYNC
binlog_commit_wait_usec = 10000
binlog_commit_wait_count = 1
server_audit_excl_users = repl@b.c,maxscale
slave-skip-errors = 1062,1032

[mysqld_safe]
syslog

[mariadb]
server_id = 228575792
log_slave_updates = on
log-bin
log-basename = db2
report_host = db2

从顶部

KiB Mem : 74046272 total,32528492 free,26723664 used,14794120 buff/cache
KiB Swap: 33554428 total,31482364 free,2072064 used. 33507036 avail Mem

解决方法

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