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출처 / 참고: VMware Broadcom Knowledge Base (Using esxtop to identify storage performance issues - KB 1008205, Multipathing policies in ESXi - KB 1011340) 명령어: esxtop, esxcli, tail, grep, awk 키워드: Datastore Latency, Storage Pathing, esxtop, DAVG/cmd, KAVG/cmd, GAVG/cmd, QAVG/cmd, NMP, Round Robin, VMW_PSP_RR, Dead Path 사용처: ESXi 데이터스토어 I/O 응답 지...

출처 / 참고: VMware Broadcom Knowledge Base (Hot-adding memory in Linux - KB 2008405, Memory Hotplug in Linux Kernel Documentation) 명령어: free, lsmem, chmem, dmesg, udevadm, cat 키워드: Memory Hot-Add, vSphere Hot-Plug, Guest OS, offline memory, /sys/devices/system/memory, udev rules, 99-vmware-scsi-udev.rules, NUMA 사용처: vSphere Web Client에서 가상 머신 ...

출처 / 참고: VMware Broadcom Knowledge Base (Investigating virtual machine file locks on ESXi - KB 10051, Virtual machine consolidation fails with error: The file is locked - KB 2107795) 명령어: vmkfstools, lsof, voma, grep, awk, hexdump 키워드: Virtual machine disks consolidation failed, File is locked, vmkfstools -D, VMFS lock, MAC address, Backup ...

출처 / 참고: VMware Broadcom Knowledge Base (Consolidating snapshots in vSphere - KB 2003638, Determining if there are leftover delta files - KB 1005049) 명령어: vim-cmd, vmkfstools, esxcli, find, grep, lsof 키워드: Consolidation Needed, Virtual machine disks consolidation is needed, Snapshot, delta disk, vSphere Client, CID mismatch, File Lock 사용처: ...

출처 / 참고: Linux man-pages (iostat(1), vmstat(8)), PostgreSQL Documentation (Using EXPLAIN), MySQL Reference Manual (EXPLAIN Statement, Slow Query Log), Brendan Gregg (Systems Performance: Enterprise and the Cloud) 명령어: iostat, vmstat, pidstat, explain, top, biolatency 키워드: Slow Query, Missing Index, Disk Latency, %util, await, r_await, w_awa...

출처 / 참고: Linux man-pages (tune2fs(8), xfs_info(8), statvfs(3)), Oracle Database Administrator’s Guide (Physical Database Structures), PostgreSQL Documentation (Database File Layout) 명령어: df, tune2fs, xfs_info, dumpe2fs, stat, blockdev, sqlplus 키워드: Filesystem Block Limit, Block Size, 4KB block, Datafile Auto-Extend Failure, ext4 max file si...

출처 / 참고: MySQL 8.0 Reference Manual (Server System Variables - max_connections), MariaDB Knowledge Base (Handling Too Many Connections) 명령어: mysql, mysqladmin, ss, netstat, ps, systemctl 키워드: Error 1040, Too many connections, max_connections, max_user_connections, wait_timeout, Sleep connections, Connection Pool, CONNECTION_ADMIN 사용처: 웹 서비스...