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SAL (System Abstraction Layer)
SAN (storage area network)
     configuration
     kernel module
     LUNs
     searching driver versions
     storage
sar command 2nd
SASI (Shugart Associates System Interface)
saving
     customization
     iptables
scanning
     drives in the wrong order
     open ports
scope, backup
SCP (secure copy)
scripts
     /usr/bin/run-parts
     atrun
     data collectors
     rc
     sendmail
SCSI (Small Computer Systems Interface)
searching
     device errors
     drivers
     hangs
second hard disks, booting from
sector alignment
secure copy (SCP)
Secure FTP (SFTP)
Secure Shell [See SSH (Secure Shell) encryption.]
security
     /lib/security file
     crontab
     firewalls
     networks
     prevention
         hardening (with netfilter/iptables)
         SSH encryption
     system
     X Window
sending signals
sendmail script
sequential speed
serial printing, local
servers
     SAN [See also SAN (storage area network).]
     terminal
     X Window [See also X Window.]
services, rc scripts
setup (hd0) command
SFTP (Secure FTP)
sharing memory
shells
     environment variables
     interfaces
     troubleshooting
Shugart Associates System Interface [See SASI (Shugart Associates System Interface).]
shutting down
     iptables, viewing rules
     TCP connections
signals, core dumps
single keyword
single partitions
single user mode 2nd
sizing
     blocks 2nd
     requests
sleep statement
slow DNS lookups
slow down, FTP
small block I/O transfers
Small Computer Systems Interface [See SCSI (Small Computer Systems Interface).]
SMP (Symmetric Multi-Processor)
social engineering attacks
SOCK argument
sockets, raw network printing
software defects (vulnerabilities)
speed
     auto-negotiation
     interfaces
     sequential
spoofing
spoolers
SPP (Standard Parallel Port)
SSH (Secure Shell) encryption
sshd daemon
stacker mode
stacks
     interruptible hangs
     missing preventing login
stage 1 files, reinstalling MBRwith GRUB
Standard Parallel Port (SPP)
starting
     kcron
     multiuser mode
     processes
     rc scripts
     X Window servers
statements, sleep
statistics
     CPUs
     disk I/O
     networking
     Oracle statspak
     vmstat command
statspak (Oracle), applying
storage
     crontab files
     devices
     PCMCIA/USB
storage area network [See SAN (storage area network).]
strain, reducing disk I/O
stripping lvol
superblock filesystem recovery
supported device failures
swapper code
swaps
     free command
     utilization
Symmetric Multi-Processor (SMP)
synchronizing NTP
sysctl command
syslog
System Abstraction Layer (SAL)
system security [See security.]