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Solaris 11.2 Tunable Parameters Reference Manual
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Updated: December 2014
Oracle
®
Solaris 11.2 Tunable Parameters Reference Manual
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Chapter 1 Overview of Oracle Solaris System Tuning
What's New in Oracle Solaris 11.2 System Tuning
Tuning an Oracle Solaris System
Tuning Format of Tunable Parameters Descriptions
Tuning the Oracle Solaris Kernel
/etc/system File and the /etc/system.d Directory
Recovering From an Incorrect Value
Resetting the Parameter in the /etc/system.d/file
Using a Cloned Boot Environment
Using File Copies
kmdb Command
mdb Command
Special Oracle Solaris tune and var Structures
Viewing Oracle Solaris System Configuration Information
sysdef Command
kstat Utility
Chapter 2 Oracle Solaris Kernel Tunable Parameters
General Kernel and Memory Parameters
physmem
default_stksize
lwp_default_stksize
logevent_max_q_sz
segkpsize
noexec_user_stack
fsflush and Related Parameters
fsflush
tune_t_fsflushr
autoup
dopageflush
doiflush
Process-Sizing Parameters
maxusers
reserved_procs
pidmax
max_nprocs
maxuprc
ngroups_max
Paging-Related Parameters
lotsfree
desfree
minfree
throttlefree
pageout_reserve
pages_pp_maximum
tune_t_minarmem
fastscan
slowscan
min_percent_cpu
handspreadpages
pages_before_pager
maxpgio
Swapping-Related Parameters
swapfs_reserve
swapfs_minfree
Kernel Memory Allocator
kmem_flags
kmem_stackinfo
General Driver Parameters
moddebug
ddi_msix_alloc_limit
Network Driver Parameters
IP Protocol Parameters in the Kernel
ipcl_conn_hash_size
ip_squeue_worker_wait
ip_squeue_fanout
igb Parameters
mr_enable
intr_force
ixgbe Parameters
tx_queue_number
rx_queue_number
intr_throttling
rx_limit_per_intr
tx_ring_size
rx_ring_size
tx_copy_threshold
rx_copy_threshold
General I/O Parameters
maxphys
rlim_fd_max
rlim_fd_cur
General File System Parameters
ncsize
dnlc_dir_enable
dnlc_dir_min_size
dnlc_dir_max_size
dnlc_dircache_percent
TMPFS Parameters
tmpfs:tmpfs_maxkmem
tmpfs:tmpfs_minfree
Pseudo Terminals
pt_cnt
pt_pctofmem
pt_max_pty
STREAMS Parameters
nstrpush
strmsgsz
strctlsz
System V Message Queues
System V Semaphores
System V Shared Memory
segspt_minfree
pr_segp_disable
Scheduling
disp_rechoose_interval
Timers
hires_tick
timer_max
SPARC: Platform Specific Parameters
tsb_alloc_hiwater_factor
default_tsb_size
enable_tsb_rss_sizing
tsb_rss_factor
Locality Group Parameters
lpg_alloc_prefer
lgrp_mem_pset_aware
Chapter 3 Oracle Solaris ZFS Tunable Parameters
Tuning ZFS Considerations
ZFS ARC Parameters
zfs_arc_min
zfs_arc_max
ZFS File-Level Prefetch
zfs_prefetch_disable
ZFS Device I/O Queue Depth
zfs_vdev_max_pending
Tuning ZFS When Using Flash Storage
Adding Flash Devices as ZFS Log or Cache Devices
Ensuring Proper Cache Flush Behavior for Flash and NVRAM Storage Devices
Tuning ZFS for Database Products
Tuning ZFS for an Oracle Database
Using ZFS with MySQL Considerations
Chapter 4 NFS Tunable Parameters
Tuning the NFS Environment
NFS Module Parameters
nfs:nfs3_pathconf_disable_cache
nfs:nfs_allow_preepoch_time
nfs:nfs_cots_timeo
nfs:nfs3_cots_timeo
nfs:nfs4_cots_timeo
nfs:nfs_do_symlink_cache
nfs:nfs3_do_symlink_cache
nfs:nfs_dynamic
nfs:nfs3_dynamic
nfs:nfs_lookup_neg_cache
nfs:nfs3_lookup_neg_cache
nfs:nfs4_lookup_neg_cache
nfs:nfs_max_threads
nfs:nfs3_max_threads
nfs:nfs4_max_threads
nfs:nfs_nra
nfs:nfs3_nra
nfs:nrnode
nfs:nfs_shrinkreaddir
nfs:nfs3_shrinkreaddir
nfs:nfs_write_error_interval
nfs:nfs_write_error_to_cons_only
nfs:nfs_disable_rddir_cache
nfs:nfs3_bsize
nfs:nfs4_bsize
nfs:nfs_async_clusters
nfs:nfs3_async_clusters
nfs:nfs4_async_clusters
nfs:nfs_async_timeout
nfs:nacache
nfs:nfs3_jukebox_delay
nfs:nfs3_max_transfer_size
nfs:nfs4_max_transfer_size
nfs:nfs3_max_transfer_size_clts
nfs:nfs3_max_transfer_size_cots
NFS-Related SMF Configuration Parameters
server_authz_cache_refresh
netgroup_refresh
rpcmod Module Parameters
rpcmod:clnt_max_conns
rpcmod:clnt_idle_timeout
rpcmod:svc_idle_timeout
rpcmod:svc_default_stksize
rpcmod:maxdupreqs
rpcmod:cotsmaxdupreqs
Chapter 5 Internet Protocol Suite Tunable Parameters
Overview of Tuning IP Suite Parameters
IP Suite Parameter Validation
Internet Request for Comments (RFCs)
IP Tunable Parameters
_icmp_err_interval and _icmp_err_burst
_respond_to_echo_broadcast and _respond_to_echo_multicast (ipv4 or ipv6)
send_redirects (ipv4 or ipv6)
forwarding (ipv4 or ipv6)
ttl
hoplimit (ipv6)
_addrs_per_if
hostmodel (ipv4 or ipv6)
IP Tunable Parameters Related to Duplicate Address Detection
_arp_defend_interval / _ndp_defend_interval
_arp_defend_period / _ndp_defend_period
_arp_defend_rate / _ndp_defend_rate
_arp_fastprobe_count
_arp_fastprobe_interval
_arp_probe_count
_arp_probe_interval
arp_publish_count/ndp_unsolicit_count
arp_publish_interval / ndp_unsolicit_interval
_defend_interval
_dup_recovery
_max_defend
_max_temp_defend
IP Tunable Parameters With Additional Cautions
_pathmtu_interval
_icmp_return_data_bytes (ipv4 or ipv6)
TCP Tunable Parameters
_deferred_ack_interval
_local_dack_interval
_deferred_acks_max
_local_dacks_max
_wscale_always
_tstamp_always
send_buf
recv_buf
max_buf
_cwnd_max
_slow_start_initial
_local_slow_start_initial
_slow_start_after_idle
sack
_rev_src_routes
_time_wait_interval
ecn
_conn_req_max_q
_conn_req_max_q0
_conn_req_min
_rst_sent_rate_enabled
_rst_sent_rate
smallest_anon_port
largest_anon_port
TCP Parameters With Additional Cautions
_keepalive_interval
_ip_abort_interval
_rexmit_interval_initial
_rexmit_interval_max
_rexmit_interval_min
_rexmit_interval_extra
_tstamp_if_wscale
_recv_hiwat_minmss
UDP Tunable Parameters
send_buf
recv_buf
max_buf
smallest_anon_port
largest_anon_port
IPQoS Tunable Parameter
_policy_mask
SCTP Tunable Parameters
_max_init_retr
_pa_max_retr
_pp_max_retr
_cwnd_max
_ipv4_ttl
_ipv6_hoplimit
_heartbeat_interval
_new_secret_interval
_initial_mtu
_deferred_ack_interval
_ignore_path_mtu
_initial_ssthresh
send_buf
_xmit_lowat
recv_buf
max_buf
_rto_min
_rto_max
_rto_initial
_cookie_life
_max_in_streams
_initial_out_streams
_shutack_wait_bound
_maxburst
_addip_enabled
_prsctp_enabled
smallest_anon_port
largest_anon_port
Per-Route Metrics
Chapter 6 System Facility Parameters
System Default Parameters
autofs
cron
devfsadm
dhcpagent
fs
ftp
inetinit
init
ipsec
kbd
keyserv
login
mpathd
nfs
nfslogd
nss
passwd
su
syslog
tar
telnetd
utmpd
Appendix A System Check Script
Confirming Flush Behavior on the System
Index
Index Numbers and Symbols
Index A
Index C
Index D
Index E
Index F
Index H
Index I
Index K
Index L
Index M
Index N
Index O
Index P
Index R
Index S
Index T
Index U
Index Z
Language:
English
F
fastscan
fastscan
forwarding
forwarding (ipv4 or ipv6)
fs
fs
fsflush
fsflush
ftp
ftp
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