加法的例子

#!/bin/sh

i=1

while [ "$i" -lt "34" ]

do

  echo $i

  i=`expr $i + 1`

done

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Increasing the number of open file descriptors – LINUX

Increasing the number of open file descriptors – LINUX, take 131072 as example.

1, increase this to 131072 for all users

vi /etc/security/limits.conf

* soft nofile 131072

* hard nofile 131072

2, ulimit –n 131072

3, You may have to modify ssh and login in pam.d. Because if not, you open a session using ssh, it will not take effect.

vi /etc/pam.d/sshd

Add

session required /lib/security/pam_limits.so

vi /etc/pam.d/login

Add

session required /lib/security/pam_limits.so

4, service sshd restart

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Replacing a failed drive in a Sun Server

Per our friend George Pagan we should be using the following procedure to replace failed/failing disks in Sun Servers:

Replacing failed sun disk

sudo vxdiskadm

Option 4 to remove the disk

Then from the OS

sudo cfgadm -f -y -c unconfigure controller::dsk/target

For example if c1t0d0 is the disk to be removed:

sudo cfgadm -f -y -c unconfigure c1::dsk/c1t0d0

This will turn on either an amber light on older machines or a blue light

on newer machines. Then it is safe to remove the drive.

After you insert the drive you run, for example:

sudo cfgadm -c configure c1::dsk/c1t0d0

Then do

devfsadm

vxdctl enable

And then option 5 in vxdiskadm to replace the disk.

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ERROR: V-3-21268: /dev/vx/dsk/dgD280silo1/orgvol is corrupted. needs checking

 

Sometime when you migrate from primary to secondary, the volume might be corrupted, just use fsck to fix it:

 

fsck -F vxfs /dev/vx/rdsk/dgD280silo1/orgvol
log replay in progress
replay complete - marking super-block as CLEAN
# mount -F vxfs /dev/vx/dsk/dgD280silo1/orgvol /orgvol

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recovery from RVG is disabled

    sometims your RVG cannot be started anyway, and the “vxprint –Vl” shows something like

    “kernel=DISABLED”

    In my case, the srl volume status is NEEDSYNC, that makes the RVG cannot be started, so repair the srl volume with following instructions:

1.  Dissociate SRL:

# vxvol -g vrdg -f dis vvrsrl

vxvm:vxvol: WARNING: Rvg rvg1 needs recovery. Volume being dissociated may not be up-to-date

2.  Stop the SRL:

# vxvol -g vrdg stop vvrsrl

3.  Start the SRL. It will take some time for the SRL to resynchronize.  You can run vxtask list from another window to monitor progress.

# vxvol start vvrsrl

4.  Re-associate the SRL:

# vxvol -g vrdg aslog rvg1 vvrsrl

5.  Recover the RVG:

# vxrecover -g vrdg -s

6.  Start the RVG:

# vxrvg start rvg1

Reference from symantec:

http://seer.entsupport.symantec.com/docs/268215.htm

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