Benchmark
You can get OpenSSL to encrypt /dev/zero with a randomized password, giving decent pseudorandom data very fast (if your CPU supports accelerating it). openssl enc -aes-256-ctr -pass pass:"$(dd if=/dev/urandom bs=128 count=1 2>/dev/null | base64)" -nosalt </dev/zero | dd of=
Bike
Browser
Problem: Whenever you access any website from a specific domain. For example http://www.abc.com/morepages/…. In the URL above, the domain is “abc.com” and “morepages” is a sub-site. The problem shows as the following: Bad Request Your browser sent a request that this server could not understand.
HOWTO: Using Dell iDRAC 7 Lifecycle Controller 2 to update Dell PowerEdge R420, R620, and R720 servers Newer Dell Servers have an option as part of their iDRAC v7 (Dell Remote Assistance Controller) to include a “Lifecycle Controller” v2. This feature can be utilized to provide updates to all firmware
Benchmark
因工作需要找一個可以取代IOmeter業界慣用的IO效能評測軟體，過去為了某些測試有初略使用了fio 這個軟體，現在要來進階了。之前用的版本是1.5.x版，現在用的是2.0.7版這兩版在測試結果的輸出上欄位不同，2.0.7版多了更多欄位這裡不細述。 為了方便定義出多種測試pattern，決定使用參數的方式而不用profile file，範例如下： fio –name=$name –rw=${iomode} –direct=1 –ioengine=libaio –runtime=30s –ioscheduler=noop –filename=/dev/$target –bs=${block} –size=80% –iodepth=${iodepth} –zonesize=$[size/stream]k –numjobs=$stream –group_reporting –minimal >>
configuration
$vim /etc/multipath.conf defaults { udev_dir /dev polling_interval 10 max_fds 8192 fast_io_fail_tmo 80 dev_loss_tmo 600 user_friendly_names yes } blacklist { devnode "^(ram|raw|loop|fd|md|dm-|sr|scd|st)[0-9]*" devnode "^hd[a-z]" devnode "^sda[0-9]
query IPMI Status: # $ISHOME/bin/ipmitool -H $IP -U $USER -P $PASS chassis power status IPMI operation: [ on | off | cycle | reset ] # $ISHOME/bin/ipmitool -H $IP -U $USER -P $PASS chassis power [ on | off | cycle | reset ] 2>&1
1. launch IPStor Java GUI console 2. click the Server node that you'd like to enable console support mode 3. Navigate to Help -> About IPStor Console 4. input "techsupporton" then hit Enter
http://youtu.be/tLFo-ERdiyQ You could do the following steps to test IPStor USB Recovery image 1. configuration repository is enabled , stored in FC device 2. run savetorepository.sh 3. restart ipstor services 4. get the configuration from IPStor configuration repository and check the content 5. delete root directory forcefully
configuration
On the Linux® operating system, administrators should open the file /etc/snmp/snmpd.conf and add this entry: trapsink ip_address community_name. To restart the SNMP service, enter service snmpd restart. vi /etc/init.d/snmptrapd OPTIONS="-A -Lfd -p /var/run/snmptrapd.pid" vi /etc/snmp/
Server
Linux CPU usage and Process Execution History Is there any way to see what process(es) caused the most CPU usage? I have AMAZON EC2 Linux which CPU utilization reaches 100 percent and make me to reboot the system. I cannot even login through SSH (Using putty). Is there any
Linux 技巧：让进程在后台可靠运行的几种方法 在 IBM Bluemix 云平台上开发并部署您的下一个应用。现在就开始免费试用 我们经常会碰到这样的问题，用 telnet/ssh 登录了远程的 Linux 服务器，运行了一些耗时较长的任务， 结果却由于网络的不稳定导致任务中途失败。如何让命令提交后不受本地关闭终端窗口/网络断开连接的干扰呢？下面举了一些例子， 您可以针对不同的场景选择不同的方式来处理这个问题。 nohup/setsid/& 如果只是临时有一个命令需要长时间运行，什么方法能最简便的保证它在后台稳定运行呢？ hangup 名称的来由 在 Unix 的早期版本中，每个终端都会通过 modem 和系统通讯。当用户 logout 时，modem 就会挂断（hang up）电话。 同理，当 modem 断开连接时，就会给终端发送 hangup 信号来通知其关闭所有子进程。 解决方法：