sar - Collect, report, or save system activity information. sadf - display collected data with various formats. do Excela! sar -[RESSOURCE] interval count sar -f /var/log/sa/saxx sar -A - raport o wszystkim sar -A 3 5 - co 3 sekundy sprawdzi, pokaze lacznie 5 wynikow sar -o - tworzy output file /var/log/sa RESSOURCE: DYSK -b Report I/O and transfer rate statistics DYSK -B Report paging statistics. BLOCK DEVICE -d Report activity for each block device lista urządzeń - -j { ID | LABEL | PATH | UUID | ... }. Display persistent device names POWER -m Report power management statistics NETWORK -n Report network statistics. PROCESSORS -p Report per-processor statistics for the specified processor -u [ ALL ] Report CPU utilization. TASKS QUEQUES - -q Report queue length and load averages -w Report task creation and system switching activity MEMORY -r Report memory utilization statistics. / -R Report memory statistics SWAP -S Report swap space utilization statistics. -W Report swapping statistics. The following values are displayed: FILES -v Report status of inode, file and other kernel tables. TERMINAL -y Report TTY device activity pidstat - procesy, wątki, children pidstat interval count pidstat -C komenda pidstat -l - wyswietli razem z komenda -t Also display statistics for threads associated with selected tasks -T { TASK | CHILD | ALL } troubleshooting: - serwer ntp defaultowo sie wylacza, jezeli ma duze opoznienie - na podstawie offset i jitter serwer ntp oblicza pooling interval (co ile odpytuje inne serwery) - im wiekszy pool, tym serwer rzadziej odpytuje - tym lepiej - ntpd -d albo ntpd -D 100 - poziom debugowania iostat - Report Central Processing Unit (CPU) statistics and input/output statistics for devices, partitions and net- work filesystems (NFS). The iostat command generates three types of reports: the CPU Utilization report, the Device Utilization report the Network Filesystem report. -c Display the CPU utilization report. -d Display the device utilization report. -h Make the NFS report displayed by option -n easier to read by a human. -x extended FILES /proc/stat contains system statistics. /proc/uptime contains system uptime. /proc/partitions contains disk statistics (for pre 2.5 kernels that have been patched). /proc/diskstats contains disks statistics (for post 2.5 kernels). /sys contains statistics for block devices (post 2.5 kernels). /proc/self/mountstats contains statistics for network filesystems. /dev/disk contains persistent device names. mpstat - Report processors related statistics. The mpstat command writes to standard output activities for each available processor, processor 0 being the first one. /etc/sysconfig/sysstat - plik konfiguracyjny dla sar nfsiostat - Emulate iostat for NFS mount points using /proc/self/mountstats /proc/self/mountstats nfsstat nfsstat - list NFS statistics FILES /proc/net/rpc/nfsd procfs-based interface to kernel NFS server statistics. /proc/net/rpc/nfs procfs-based interface to kernel NFS client statistics. /proc/mounts procfs-based interface to the mounted filesystems. color: #146b9d;