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If we want to administering log files on solaris, we can use logadm. Another option we also can use logrotate.
For example :
we have log files at /var/log/tinyproxy.log
1. we want to rotate log after reach 1MB.
# logadm -w /var/log/tinyproxy.log -s 1m

2. we want to rotate log every day.
# logadm -w /var/log/tinyproxy.log -p 1d

3. we want to keep until previous 10 day only.
# logadm -w /var/log/tinyproxy.log -C10

etc…

for more details, you should see logadm manual.
File configuration of logadm at /etc/logadm.conf

For default logadm run every morning 3:10 AM by crontab process.
You can see crontab list with this :
# crontab -e

If you just see number after running command above,
# crontab -e
713

you should define your editor profile.
# export EDITOR=vi
# crontab -e

Shows the ethernet address arp table
# arp -a

Delete a stale ethernet entry for host xhost
# arp -d xhost

Reports disk space used in Kilobytes
# du -k

Reports only total disk space used in Kilobytes
# du -sk

Tells you how big the / files are in reverse order
# du -ad / | sort -nr

Mount an ISO 8660 CDROM
# /bin/mount -F hsfs -o ro /dev/sr0 /cdrom

Disk geometry and partitioning info
# prtvtoc /dev/rdsk/c0t0d0s2

Zero’s out the file without breaking pipe
# cat /dev/null > filename

Make a mirror image of your boot disk
# dd if=/dev/rdsk/… of=/dev/rdsk/… bs=4096

Check a UFS filesystem
# fsck -F ufs /dev/rdsk/cxtxdxsx

Check a UFS filesystem with auto-answer “yes”
# fsck -F ufs -y /dev/rdsk/cxtxdxsx

Check using an alternate super block
# fsck -F ufs -o b=97472 /dev/rdsk/cxtxdxsx

Verify reconfigurable hardware resources
# cfgadm

Display kernel module information
# /usr/sbin/modinfo

Load a kernel module
# /usr/sbin/modload

Unload a kernel module
# /usr/sbin/modunload -i

Tuneable kernel parameters
# nm -x /dev/ksyms | grep OBJ | more

Show system kernal tunable details
# /usr/sbin/sysdef

Display Memory Size
# prtconf | grep “Memory size”

Displays number active established connections to localhost
# netstat -a | grep EST | wc -l

Network statistics for specific device
# netstat -k hme0

Show the TCP/IP network interfaces
# netstat -i

Displays routing information but bypasses hostname lookup
# netstat -rn

Show the state of all sockets
# netstat -a | more

Follow the route to the ipaddress
# traceroute

Show processes that are running from /var
# fuser -uc /var

Shows processes’ current open files
# pfiles

An alternative for top command
# prstat -a

Displays CPU % usage for each process in ascending order
# /usr/ucb/ps -aux | more

Show all processes running
# ps -ef | more

Print the parent/child process ‘tree’ of a process
# /usr/proc/bin/ptree

Print the working directory of a process
# /usr/proc/bin/pwdx

Returns the process utilizing the most cpu and quits
# top -b 1

Watch all network packets on device ce0
# snoop -d ce0

Saves packets from device ce0 and between host1 and host2 to a file
# snoop -o /tmp/mylog -d ce0 host1 host2

Makes a 10 Megabyte swapfile in /export/disk
# mkfile -v 10m /export/disk1/myswap

List the amount of swap space available
# swap -s

Add a swapfile
# swap -a /export/disk1/swapfile

Deletes a swap device
# swap -d /dev/dsk/c0t0d0s4

List the current swap devices
# swap -l

Changes eeprom autoboot? setting to auto boot
# /usr/sbin/eeprom auto-boot? true

Set the system to perform diagnostics on the next reboot
# /usr/sbin/eeprom diagswitch? true

Check /etc/group file syntax
# /usr/sbin/grpck

Check /etc/passwd file syntax
# /usr/sbin/pwck

Clear host specific network configuration information
# /usr/sbin/sys-unconfig

Show eeprom parameters
# /usr/sbin/eeprom

Show system configuration details
# /usr/sbin/prtconf -vp

Display number of processors
# psrinfo | wc -l

Provides cumulative system report
# sar -A

Report use of file access system routines
# sar -a

Report CPU Utilization
# sar -u

Displays system information
# uname -a

Show I/O error solaris
# iostat -eE
—- errors —

sd0 0 0 0 0
ssd0 0 0 0 0
ssd1 0 0 0 0
nfs2 0 0 0 0
sd0 Soft Errors: 0 Hard Errors: 0 Transport Errors: 0
Vendor: TOSHIBA Product: ODD-DVD SD-C2732 Revision: 1051 Serial No:
Size: 0.00GB
Media Error: 0 Device Not Ready: 0 No Device: 0 Recoverable: 0
Illegal Request: 0 Predictive Failure Analysis: 0
ssd0 Soft Errors: 0 Hard Errors: 0 Transport Errors: 0
Vendor: FUJITSU Product: MAT3073F SUN72G Revision: 0602 Serial No: 0527B08LLN
Size: 73.40GB
Media Error: 0 Device Not Ready: 0 No Device: 0 Recoverable: 0
Illegal Request: 0 Predictive Failure Analysis: 0
ssd1 Soft Errors: 0 Hard Errors: 0 Transport Errors: 0
Vendor: FUJITSU Product: MAT3073F SUN72G Revision: 0602 Serial No: 0526B08BHH
Size: 73.40GB
Media Error: 0 Device Not Ready: 0 No Device: 0 Recoverable: 0
Illegal Request: 0 Predictive Failure Analysis: 0

For file descriptor, add this lines to /etc/system
# vi /etc/system
—————-
set rlim_fd_max=8192
#(def: 1024, Process open file descriptors limit; should account for the expected load, for the associated sockets, files, pipes if any)
set rlim_fd_cur=8192
#(def: 256, Process open file descriptors limit; should account for the expected load, for the associated sockets, files, pipes if any)
set sq_max_size=0
#(Controls streams driver queue size; setting to 0 makes it infinity so the performance runs wont be hit by lack of buffer space)
set tcp:tcp_conn_hash_size=8192
#(The connection hash table keeps all the information for active TCP connections)
set autoup=60
set pcisch:pci_stream_buf_enable=0
—————–

You should reboot your server to make changes.

Setting TCP kernel parameter solaris

How to know your TCP current kernel parameter

# /usr/sbin/ndd -get /dev/tcp tcp_ip_abort_cinterval;
180000
# /usr/sbin/ndd -get /dev/tcp tcp_time_wait_interval;
60000
# /usr/sbin/ndd -get /dev/tcp tcp_conn_req_max_q;
128
# /usr/sbin/ndd -get /dev/tcp tcp_conn_req_max_q0;
1024
# /usr/sbin/ndd -get /dev/tcp tcp_ip_abort_interval;
480000
# /usr/sbin/ndd -get /dev/tcp tcp_keepalive_interval;
7200000
# /usr/sbin/ndd -get /dev/tcp tcp_rexmit_interval_initial;
3000
# /usr/sbin/ndd -get /dev/tcp tcp_rexmit_interval_max;
60000
# /usr/sbin/ndd -get /dev/tcp tcp_rexmit_interval_min;
400
# /usr/sbin/ndd -get /dev/tcp tcp_smallest_anon_port;
32768
# /usr/sbin/ndd -get /dev/tcp tcp_slow_start_initial;
4
# /usr/sbin/ndd -get /dev/tcp tcp_xmit_hiwat;
49152
# /usr/sbin/ndd -get /dev/tcp tcp_recv_hiwat;
49152
# /usr/sbin/ndd -get /dev/tcp tcp_fin_wait_2_flush_interval;
30000

Change your TCP kernel parameter as you want :p
/usr/sbin/ndd -set /dev/tcp tcp_ip_abort_cinterval 10000;
/usr/sbin/ndd -set /dev/tcp tcp_time_wait_interval 30000;
/usr/sbin/ndd -set /dev/tcp tcp_conn_req_max_q 1024;
/usr/sbin/ndd -set /dev/tcp tcp_conn_req_max_q0 4096;
/usr/sbin/ndd -set /dev/tcp tcp_ip_abort_interval 60000;
/usr/sbin/ndd -set /dev/tcp tcp_keepalive_interval 300000; -For high traffic web sites lower this value-
/usr/sbin/ndd -set /dev/tcp tcp_rexmit_interval_initial 3000; -If retransmission is greater than 30-40%, you should increase this value-
/usr/sbin/ndd -set /dev/tcp tcp_rexmit_interval_max 10000;
/usr/sbin/ndd -set /dev/tcp tcp_rexmit_interval_min 3000;
/usr/sbin/ndd -set /dev/tcp tcp_smallest_anon_port 1024;
/usr/sbin/ndd -set /dev/tcp tcp_slow_start_initial 2; -Slightly faster transmission of small amounts of data-
/usr/sbin/ndd -set /dev/tcp tcp_xmit_hiwat 32768; -To increase the transmit buffer-
/usr/sbin/ndd -set /dev/tcp tcp_recv_hiwat 65536; -To increase the receive buffer-
/usr/sbin/ndd -set /dev/tcp tcp_fin_wait_2_flush_interval 1000; -if you want to release FIN-WAIT_2 connections faster-

or you can add all above “set” command at /etc/init.d/inetsvc or create new file on /etc/rc3.s/Sxx