Recommend Computer Room Temperature

What temperature is right?

General recommendations suggest that you should not go below 10°C (50°F) or above 28°C (82°F). Although this seems a wide range these are the extremes and it is far more common to keep the ambient temperature around 20-21°C (68-71°F). For a variety of reasons this can sometimes be a tall order.

How do you maintain the right temperature?

Purpose built server rooms are well insulated for fire precaution reasons and air conditioning is essential. In many companies however the maintenance of the air conditioning is separate from the running of the servers. If the air conditioning fails you might not be the first to know. You may even be the last.

Even if everything is working the temperature may fluctuate during the day, from season to season, and there is always the possibility of localized hot-spots around equipment giving off lots of heat.

Don’t be tempted to think that just because you have an air conditioning unit that is up to the job that you are safe. People working in the server room sometimes switch the air conditioning off and forget to turn it on again. Sometimes they leave doors open. Servers run hotter at some times of the day than at others, air conditioning systems sometimes run at lower power at night etc.

What if it’s night time, your air conditioning is running at low power, and your webserver suddenly starts to work hard because the west coast has woken up? Now your machine heats up and your air conditioning can’t cool it enough. Exactly this scenario has been know to happen. Many intermittent faults and slow downs can be traced to overheating.

Replacing old equipment can introduce a new set of problems. Newer machines run faster and often run hotter as well, increasing the burden on the air conditioning systems even more. If you’ve recently introduced new servers or modern switches, it might be time to examining your air conditioning unit to make sure it can still keep up.

Another thing to look out for is the scenario where you turn up the air conditioning unit during the day, in order to ensure the right environment in your server room, but then don’t switch it down during the night or weekends. During the day there might be a lot of activity into and out of the server room. The server room door being opened all of the time lets warmer air into the server room thus necessitating the air conditioning system to be turned up high. At night and at the weekend, without the same level of activity, you may be running up large energy bills for no reason.

How are you going to monitor the temperature?

You need to monitor the temperature in your server room all of the time, especially at night and weekends when nobody is around. A number of systems are available for this purpose, the Temperature Monitor range from OPENXTRA offer good products at reasonable prices. You need to measure temperatures at different points in the room to get an idea of where the hot spots might be. You need temperature measurement to be automated and reliable, so a network attached device is ideal. The device must support alarms, via a number of different methods like email or SMS. You should be able to set the system up and then be alerted when something is wrong.

Information Source: https://www.openxtra.co.uk/kb/environment-monitoring/recommended-server-room-temperature.html

Common Feature of IT Service Management tool

Common Feature of IT Service Management Tool as below:

  • Fully configurable CMDB
  • HelpDesk and Incident Management
  • Service and Contract Management
  • Change Management
  • Configuration Management
  • Automatic SLA management
  • Automatic impact analysis
  • CSV import tool for all data
  • Consistency audit to check data quality
  • Data synchronization (data federation)

IT Routine Work Highlight

IT Routine Work

  • Check Daily Backup
  • Perform Monthly Backup for permanent storage at least 3 years
  • Check the archive and life email client database (.pst file which should not bigger too big, especially outlook 2003 or lower version .pst file should not larger than 2G size)
  • Perform Monthly Email Archive in outlook server
  • Check Backup of ERP system, and clean-up log file if necessary
  • Handle ERP, HR, Email, Share File System, CCTV, Printer, network and phone line routine support
  • Backup machine O/S, VMWare Machine Databases at least quarterly
  • Perform Off-Site Backup Storage
  • Reboot servers at least quarterly
  • New Staff computer preparation for email account creation, share-drive access right, printer, door access card, phone
  • Staff Exist Preparation for email transfer/deletion, backup computer data
  • Handle Ad-Hoc IT project

IT Critical Document:

  • password list
  • Inventory list
  • Internet/External Support contact list

Blacklist Email Delivery (邮箱不能发送邮件)

Section 1 Problem (邮箱不能发送邮件)

Do you experience the email delivery error which some emails cannot delivery to some mail addresses (but not all) ? The return error email message as below 5 examples.

>>>Error Message 1 Begin>>>

xxxx@xxxcs.com

ironporta1.molasia.com 發生這個錯誤:
#5.7.1 Your access to submit messages to this e-mail system has been rejected.

將此郵件傳送到這個電郵地址時發生問題。請嘗試重新傳送此郵件。如果問題持續發生,請連絡支援人員。

xxx@xxxcs.com

ironporta1.xxxx.com 發生這個錯誤:
#5.7.1 Your access to submit messages to this e-mail system has been rejected.

將此郵件傳送到這個電郵地址時發生問題。請嘗試重新傳送此郵件。如果問題持續發生,請連絡支援人員。

>> >Error Message 1 End>>>

>>>Error Message 2 Begin>>>

COL004-MC1F49.hotmail.com 拒絕您傳送至下列電郵地址的郵件:

rxxxxu@hotmail.com

COL004-MC1F49.hotmail.com 發生這個錯誤:
OU-002 (COL004-MC1F49) Unfortunately, messages from 2xx.xx.xxx.250 weren’t sent. Please contact your Internet service provider since part of their network is on our block list. You can also refer your provider to http://mail.live.com/mail/troubleshooting.aspx#errors.

將此郵件傳送到這個電郵地址時發生問題。請嘗試重新傳送此郵件。如果問題持續發生,請連絡支援人員。

 

系統管理員的診斷資訊:

產生的伺服器: mail.xxxxx.com.hk

rxxxxxu@hotmail.com
COL004-MC1F49.hotmail.com #550 OU-002 (COL004-MC1F49) Unfortunately, messages from 2xx.xx.xxx.250 weren’t sent. Please contact your Internet service provider since part of their network is on our block list. You can also refer your provider to http://mail.live.com/mail/troubleshooting.aspx#errors. ##

>>> Error Message 2 End>>>

>>>Error Message 3 Begin>>>

sun.01link.net 拒絕您傳送至下列電郵地址的郵件:

xxx@xxx.com

sun.01link.net 發生這個錯誤:
“JunkMail rejected – mail.keetat.com.hk [2
xx.xx.xxx.250]:28500 is in an RBL, see Blocked – see http://cbl.abuseat.org/lookup.cgi?ip=219.76.176.250

將此郵件傳送到這個電郵地址時發生問題。請嘗試重新傳送此郵件。如果問題持續發生,請連絡支援人員。

>>> Error Message 3 End>>>

>>>Error Message 4 Begin>>>

傳遞至下列收件者或群組失敗:

xxx@xxxl.com
伺服器嘗試傳遞此郵件,但沒有成功,現在已停止嘗試。請嘗試重新傳送此郵件。如果問題持續發生,請聯絡支援人員。

>>> Error Message 4 End>>

>>>Error Message 5 Begin>>>

From: Mail Delivery System [mailto:MAILER-DAEMON@yxxxr.com]

Sent: Wednesday, April 01, 2015 1:00 PM

To: xxxxx@xxx.com.hk

Subject: Undelivered Mail Returned to Sender

Importance: High

 

This is the mail system at host uk.yi-enter.com.

 

I’m sorry to have to inform you that your message could not be delivered to one or more recipients. It’s attached below.

 

For further assistance, please send mail to postmaster.

 

If you do so, please include this problem report. You can delete your own text from the attached returned message.

 

The mail system

 

<xxx@xxxx.com>: host mxwcom.263xmail.com[211.150.82.6] said: 550

xxx@xxxx.com:user not exist (in reply to RCPT TO command)

>>> Error Message 5 End>>>

 

Section 2. Investigation (分析)

The problem is that those reputed network computer declared our email domain server is spam and blacklist us. We found from the http://mxtoolbox.com, and it will come up the blacklist result which we require to apply for removing blacklist item one by one. However, Weexperience that those blacklist is very difficult to be completely removed. The actual situation is that we cannot guarantee our network without any spam and virus especially difficult for small SME without much investment on network security.

email-blacklist-1

Even-though I submitted for removal, the result was that some were removed, but some others added, as below diagram.Maybe a period of time after removal, it put thedomain to blacklist again.It is a very annoying problem, and quite trouble.

email-blacklist-2

Section 3. Solution (解决方法)

Join the Email Relay Pay Service. 付费给中继服务供应商,采用他们的中继服务器作为Exchange转发主机,设置如下描述。

Step 1. 打开Exchange2010管理控制台-〉组织配置-〉集线器传输-〉发送连接器

email-relay-1

Step 2.右键新建发送连接器,填写smtp名称

email-relay-2

Step 3. 添加地址空间

email-relay-3

Step 4. 在地址空间添加SMTP,输入*走中继服务。

email-relay-4

Step 5. 选择通过以下智能主机路由邮件

email-relay-5

Step 6. 添加新的智能主机,完全限定的域名:mailrelay.xxxxx.com(手动输入确保正确)

email-relay-6

Step 7.

email-relay-7

Step 8

email-relay-8

Step 9

email-relay-9

Step 10

email-relay-10

Step 11

email-relay-11

 

Step 12. 自己的连接器需要禁用,Select “Yes” below:

email-relay-12

 

Step 13. 重启exchange 传输服务,传输服务在windows系统的管理工具的服务里面,查找 Exchange  Transport Service。 restart

email-relay-13

Step 14. 在域名的dns管理下面加上中继地址的记录,v=spf1 include:spf.yi-xxxxr.com ~all

替换掉这一条无用的spf记录

 

 

email-relay-14

email-relay-15

 

Step 15. dns系统可能在国内还未刷新,在谷歌已经刷新了,仍有退信问题,就是spf记录!不用太担心!生效后,就可以了!

亦可删除以下的DNS项目,disable 谷歌:

Text(TXT) ,google-site-verification=KQNoFNHJ2d18XVfDByr1Yh6asZru7Opedw-c6p2DM-o

email-relay-16

 - END -

规范电子邮件发送对象

主旨: 规范发送邮件的收件者,减少不必要的邮件传递,防止收件人浪费收阅邮件的时间。

问题现象:若果当事人每天收到的邮件达200-250份,如果不全数阅读这些邮件,会担心重要的信息被忽略,如果全数阅读邮件,则又会浪费很多的时间,处理不到其它事情。我相信很多人有这样的烦恼。 Read More

有效电邮通信的9个技巧

1。 显示名称
正确在电邮中显示您自己的姓名,这是收件人将收到您的第一个良好印象。
各自邮件的‘个人信息显示名称要填写,例如:王大明的 “Wang Daimin(王小明)”,英文姓的第一个字母为大写,英文名的第一个字母也为大写,姓与名之间加空格作为间隔,中文姓名写在括号内;致於公共邮箱而又是专人专用,应按公司标准格式,写上中英文姓名,若是多人共用的部门邮箱,亦应写上英文部门名称,及中文部门名称於括号内。 Read More