版本:oceanbase-ce-3.1.0-2.el7.x86_64.rpm
系统版本:CentOS Linux release 7.2.1511

错误日志：[2021-07-01 14:43:35.963182] ERROR [STORAGE] scan_store_dir (ob_raid_file_system.cpp:707) [49070][0][Y0-0000000000000000] [lt=11] [dc=0] disk num in store dir is not valid(ret=-4337, disk_num=-1, OB_MAX_DISK_NUMBER=32, sstable_dir="/data/observer01/store/sstable", errno=2) BACKTRACE:0x771c1ba 0x7653a12 0x1a12779 0x1a12e0b 0x5e6a677 0x5e6a81b 0x5e23d51 0x6404202 0x6d620a1 0x6d62bcd 0x1a0aab2 0x7f984e4b8505 0x19fc269

disk num in store dir is not valid 存储目录有哪些要求？

启动配置:
cd /data/observer01 && /home/admin/oceanbase/bin/observer -r 10.1.61.13:6882:6881 -o __min_full_resource_pool_memory=268435456,memory_limit=16G,system_memory=8G,stack_size=512K,cpu_count=4,cache_wash_threshold=1G,workers_per_cpu_quota=10,schema_history_expire_time=1d,net_thread_count=4,sys_bkgd_migration_retry_num=3,minor_freeze_times=10,enable_separate_sys_clog=0,enable_merge_by_turn=False,datafile_size=50G,enable_syslog_recycle=True,max_syslog_file_count=10 -z zone1 -p 6881 -P 6882 -c 20210701 -d /data/observer01/store -n clusterocean -i ens32 -l INFO