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观后感:开发一个世界时,切勿牺牲另一个世界,原来地球人比外星人还狠。
We don’t need to sacrifice any world for anything;  E.T. should watch out the Earthling !!!

图文阐释-DAS-NAS-SAN

转帖自学.

目前磁盘存储市场上,存储分类(如下表一)根据服务器类型分为:封闭系统的存储和开放系统的存储,封闭系统主要指大型机,AS400等服务器, 开放系统指基于包括Windows、UNIX、Linux等操作系统的服务器;开放系统的存储分为:内置存储和外挂存储;开放系统的外挂存储根据连接的方 式分为:直连式存储(Direct-Attached Storage,简称DAS)和网络化存储(Fabric-Attached Storage,简称FAS);开放系统的网络化存储根据传输协议又分为:网络接入存储(Network-Attached Storage,简称NAS)和存储区域网络(Storage Area Network,简称SAN)。由于目前绝大部分用户采用的是开放系统,其外挂存储占有目前磁盘存储市场的70%以上,因此本文主要针对开放系统的外挂存 储进行论述说明。
表一:

今天的存储解决方案主要为:直连式存储(DAS)、存储区域网络(SAN)、网络接入存储(NAS)。如下表二:
开放系统的直连式存储(Direct-Attached Storage,简称DAS)已经有近四十年的使用历史,随着用户数据的不断增长,尤其是数百GB以上时,其在备份、恢复、扩展、灾备等方面的问题变得日益困扰系统管理员。
主要问题和不足为:
直连式存储依赖服务器主机操作系统进行数据的IO读写和存储维护管理,数据备份和恢复要求占用服务器主机资源(包括CPU、系统IO等),数据流需要回流 主机再到服务器连接着的磁带机(库),数据备份通常占用服务器主机资源20-30%,因此许多企业用户的日常数据备份常常在深夜或业务系统不繁忙时进行, 以免影响正常业务系统的运行。直连式存储的数据量越大,备份和恢复的时间就越长,对服务器硬件的依赖性和影响就越大。
直连式存储与服务器主机之间的连接通道通常采用SCSI连接,带宽为10MB/s、20MB/s、40MB/s、80MB/s等,随着服务器CPU的处理 能力越来越强,存储硬盘空间越来越大,阵列的硬盘数量越来越多,SCSI通道将会成为IO瓶颈;服务器主机SCSI ID资源有限,能够建立的SCSI通道连接有限。
无论直连式存储还是服务器主机的扩展,从一台服务器扩展为多台服务器组成的群集(Cluster),或存储阵列容量的扩展,都会造成业务系统的停机,从而 给企业带来经济损失,对于银行、电信、传媒等行业7×24小时服务的关键业务系统,这是不可接受的。并且直连式存储或服务器主机的升级扩展,只能由原设备 厂商提供,往往受原设备厂商限制。
存储区域网络(Storage Area Network,简称SAN)采用光纤通道(Fibre Channel)技术,通过光纤通道交换机连接存储阵列和服务器主机,建立专用于数据存储的区域网络。SAN经过十多年历史的发展,已经相当成熟,成为业 界的事实标准(但各个厂商的光纤交换技术不完全相同,其服务器和SAN存储有兼容性的要求)。SAN娲⒉捎玫拇?宽??00MB/s、200MB/s,发 展到目前的1Gbps、2Gbps。
网络接入存储(Network-Attached Storage,简称NAS)采用网络(TCP/IP、ATM、FDDI)技术,通过网络交换机连接存储系统和服务器主机,建立专用于数据存储的存储私 网。随着IP网络技术的发展,网络接入存储(NAS)技术发生质的飞跃。早期80年代末到90年代初的10Mbps带宽,网络接入存储作为文件服务器存 储,性能受带宽影响;后来快速以太网(100Mbps)、VLAN虚网、Trunk(Ethernet Channel) 以太网通道的出现,网络接入存储的读写性能得到改善;1998年千兆以太网(1000Mbps)的出现和投入商用,为网络接入存储(NAS)带来质的变化 和市场广泛认可。由于网络接入存储采用TCP/IP网络进行数据交换,TCP/IP是IT业界的标准协议,不同厂商的产品(服务器、交换机、NAS存储) 只要满足协议标准就能够实现互连互通,无兼容性的要求;并且2002年万兆以太网(10000Mbps)的出现和投入商用,存储网络带宽将大大提高NAS 存储的性能。NAS需求旺盛已经成为事实。首先NAS几乎继承了磁盘列阵的所有优点,可以将设备通过标准的网络拓扑结构连接,摆脱了服务器和异构化构架的 桎梏;其次,在企业数据量飞速膨胀中,SAN、大型磁带库、磁盘柜等产品虽然都是很好的存储解决方案,但他们那高贵的身份和复杂的操作是资金和技术实力有 限的中小企业无论如何也不能接受的。NAS正是满足这种需求的产品,在解决足够的存储和扩展空间的同时,还提供极高的性价比。因此,无论是从适用性还是 TCO的角度来说,NAS自然成为多数企业,尤其是大中小企业的最佳选择。
NAS与SAN的分析与比较
针对I/O是整个网络系统效率低下的瓶颈问题,专家们提出了许多种解决办法。其中抓住症结并经过实践检验为最有效的办法是:将数据从通用的应用服务器中分离出来以简化存储管理。
由图1可知原来存在的问题:每个新的应用服务器都要有它自己的存储器。这样造成数据处理复杂,随着应用服务器的不断增加,网络系统效率会急剧下降。
图 2
从图2可看出:将存储器从应用服务器中分离出来,进行集中管理。这就是所说的存储网络(Storage Networks)。
使用存储网络的好处:
统一性:形散神不散,在逻辑上是完全一体的。
实现数据集中管理,因为它们才是企业真正的命脉。
容易扩充,即收缩性很强。
具有容错功能,整个网络无单点故障。
专家们针对这一办法又采取了两种不同的实现手段,即NAS(Network Attached Storage)网络接入存储和SAN(Storage Area Networks)存储区域网络。
NAS:用户通过TCP/IP协议访问数据,采用业界标准文件共享协议如:NFS、HTTP、CIFS实现共享。
SAN:通过专用光纤通道交换机访问数据,采用SCSI、FC-AL接口。
什么是NAS和SAN的根本不同点?
NAS和SAN最本质的不同就是文件管理系统在哪里。如图:
由图3可以看出,SAN结构中,文件管理系统(FS)还是分别在每一个应用服务器上;而NAS则是每个应用服务器通过网络共享协议(如:NFS、CIFS)使用同一个文件管理系统。换句话说:NAS和SAN存储系统的区别是NAS有自己的文件系统管理。
NAS是将目光集中在应用、用户和文件以及它们共享的数据上。SAN是将目光集中在磁盘、磁带以及联接它们的可靠的基础结构。将来从桌面系统到数据集中管理到存储设备的全面解决方案将是NAS加SAN。

CMDB Value Points 价值点

The point value

CMDB的价值点分为两类:硬收益和软收益。从硬收益的角度,CMDB的用户可能会让你来描述CMDB对他们的价值点。下面的几个轶事可以作为收集CMDB可能为你的企业带来价值点的几个方向:

  • 把IT环境的可视化带到更高程度 –一领先的制热和冷却系统供应商指出,他们始终无法很好的理解一个计划外停机时间对用户所造成影响。例如,当只有25个用户受到了网络中断问题的影响,IT部门必须通知用户群中的全部100个用户。这会导致一个客户满意度低的反馈。CMDB使该公司能够理解配置项之间的关系,并确切地知道在任何确定时刻什么用户会受到影响。现在用户间可信的沟通能够来自于各个IT部门,并且使IT成为业务不可分割的一部分。
  • 按业务目标来安排系统变更的优先度–大型设备制造商不得不关闭了其所有的系统,后来发现不知道哪些服务器应该先启动。CMDB使公司能区分关键业务元素的优先度,确保减少计划外的停机时间,无形中降低了收入损失的风险。
  • 减少软件许可证的费用的同时确保用户和服务器能整体的满足许可证遵从性 — -的半导体制造商开展了一个审计,结果另他们感到震惊:该公司支持在为大量已经报废的服务器支付支持和维护费用。实际上,该公司关于报废资产的数量已经长期和实际不符了。CMDB有助于该公司发现这一问题,并重新分配预算资金,以更好地支持现有的基础设施。
  • 为加快服务器整合提供更深层次的资产和关系信息 — 一大型的金融服务提供商注意到,在其行业的公司通常在一个较短的时间内,会进行几次成功并购和整合。对于如何整合所有的IT部门是一个重大挑战(有时是次要的),他们往往是停留在相互隔离的工作状态下。然而,使用CMDB的公司就能够有效地集成新的收购,从而节省资金和为公司内部建立统一的IT业务形象。

IT要实现CMDB的硬收益,一般通过降低以下对象的相关成本来实现:人、第三方服务、软件、硬件和设施。这些方面的价值点可以通过财务方面的分析报表来反映出来。

Continue reading ‘CMDB Value Points 价值点’

At end of 2009

happy new year 2010!
Martin Liu’s blog move to 72pines. I will see how long I could still here. Let’s say 6 months.
在 3 月 19 日 19 时

To do list
[add] I’d like to blog more about C-Bank CMDB project implement.
[add] I hope I could have sometime for playing with open source software, like opennms, zenoss, otrs, etc…
[del] All of duplicate blog post will be deleted from some of my old blog site, including blogspot, chinaunix, msn space etc…
To be continued….

垃圾网站的殉葬品-个人博客

如果拥有个人博客,并且拥有个人域名,正在租用一个小服务商的虚拟机,那么你的网站可能已经无法访问,由于域名为注册被封,或者由于服务商的机器干 脆被连窝端而无法访问。如果你是我的blog的读者的话,我想你已经发现,我的blog已经无法访问两天了。我已经可以想象今天的国内互联网上,国内的自 由博主们,已经是哀鸿遍地了!!!

更有甚者成,我国之互联网正进入全球最大的局域网时代。对垃圾网站的严打可以,但是打到这个程度,究竟打击了谁,我相信那些害群只马一定会转移到国 外,继续他们的活动。所以,倒霉的还是很多自由博主,还是那些提供小型博客服务的小服务商。我想新浪、搜狐、百度他们的blog的注册量这几天肯定在节节 攀升吧~那就透着乐吧,我想他们肯定在唱“我们的生活充满了阳光~~~~”国内博客的行业亟待实名制管理,自由博主们也需要阳光。我的博客还无法还原两个 月的内容丢失,阴霾笼罩着我。

十月围城

港片也能这么拍的如此严肃,港人爱国,武打片打到这么痛楚,普通人普通情感才感人,师徒,父子,领袖和革命党,朋友,夫妻,宏大的历史背景下,平常市井生活里,对最关心的人,关心到底有多少,想爱趁早多一点!

老美真的很扯,一个职位的帖子被顶了22次

Remedy的开发人员或许熟悉这个邮件列表,ARSlist.org;如果没注册的话,一定需要注册一下啊,不为别的,学学英语,看看其他人都聊什么,有什么问题总是不错的。下面这个段子就是最近我看过的最扯的讨论。关键词:Remedy, 职位, OH州,辛辛那提,Developer,伊拉克,ARS 6.3, ARS 7.5, ITSM 7.5, 巴格达, AK 47,武器,活动链,过滤器,阿富汗,薪水,简历,顾问……. engoy!!!!

——————————————————————
Job: Permanent - Lead Remedy Developer - Cincinnati, OH
Dear List,
—————————————1———————-
Merry Christmas!
Title: Lead Remedy Developer
Location: Cincinnati, OH
Duration: Permanent (Relocation is offered)
Start Date: 2-4 Weeks
Must haves:
- 5+ Years experience with Remedy
- Experience with 7.x
- Stable Resume (No Consultant Resume’s) (Client does not like job hoppers and will reject)
Description: As a senior developer, the individual will create, design, develop, test and implement Remedy applications and workflow enhancements from business requirements, in accordance with the corporate procedures and standards. This individual may also serve as a business analyst or project manager on select projects and may train Remedy users as required.

Additionally, the individual will be responsible for the daily administration, maintenance, monitoring and support of all Remedy applications, servers and reporting in a high-available 24×7 environment. The individual is expected to evaluate Remedy application patches, enhancements and new releases as necessary.

ITIL certification
CMDB design
Project Management and SDLC experience
Business requirements gathering
Remedy Integration with other technologies and systems
Respectfully,
Joshua Kitchen
Senior Recruiter
Kforce Federal
937.449.1749 office
jkitchen@kforce.com
http://www.govtrecruiter.com
Great People = Great Results®

—————————————————–2————
**
- Stable Resume (No Consultant Resume’s) (Client does not like job hoppers and will reject)
My 2 cent
Having been a Consultant for 8+ years (Remedy Developer for 13+ years), and then taking a Full Time Remedy position with a local company, the value I bring to the organization is huge. As I have seen a lot, traveled the world, assisted a wealth of customers with numerous ITSM and bespoke applications, have a breath of experience that most “Stable” Remedy developers do not have. If there is a seasoned Developer/Consultant that is ready to settle down and eliminate traveling, your client should really rethink their definition of “Stable”, because a Consultant is not a “Job Hopper”

Doug

—————————————————–3————
Joshua,

**
- Stable Resume (No Consultant Resume’s) (Client does not like job hoppers and will reject)
Really! What planet is your client from? I would think most consultants would be glad to MILK a project for ALL its worth. But that would be bad business for the employer. So projects tend to adhere to budgeting constraints.

It is not the consultant’s fault that many Remedy projects end on or ahead of schedule. Unless he/she has worked TOO hard. Apparently your client does not want THAT GUY.

—————————————————–4————
As my last “Permanent” job was for an “*UN*Stable” company that *Disappeared* one month end of last year,
I couldn’t have said it better myself…spot on Doug!
Happy Holidays To You and Yours!

—————————————————–5————
Read between the lines dudes :-)

We need a Lead Remedy developer who has the experience of a junior/trainee Remedy Administrator, and who is willing to work at the wages of a gas station attendant.. No expenses paid. Must be willing to work late hours - no overtime.. Must have had his first job as a gas service attendant for at least 5 years..

;-)

Joe
—————————————————–6————
You guys give ol Josh a break, he is just relaying what his customer wants… If any consultants want to apply for that position I bet you can send an updated resume to accommodate getting to the interview. I think that it’s funny though that some employers do not realize anything about this product or the way that it is developed or administered. But I guess that is what recruiters are actually for right?

—————————————————–7————
Hey Tommy,

We just like to have harmless fun sometimes :-) We know (at least most of us) Josh for a while as well as the fact that recruiters / employers sometimes have no clue what they are talking about. Time and again I have come across employing interviewers question me about the implementation of ITIL as if it were a physical product. Its nothing new.

Yes not so hard to update a resume to make it like you were on a ’stable’ job and not a ‘job hopper’. Technically if I were to do that, it would look like I worked for just 2 companies over the 12 years I have worked with Remedy. I had to do just quite the opposite when I started looking for consulting gigs, and name every customer my old company had as a different project so that it would look more like a ‘job hoppers’ resume.

Its just a wrapping paper. At the end of the day you are the real stuff - what you know or do not, and can do or cannot, makes the difference to a smart employer (if they exist).

Joe

——————————————————-8——–
Did you notice the slight jab at the end of the note? I just wanted to get in a shot. It drives me crazy that there is such a disconnect between the hiring manager and the HR team in most companies.

One of my favorite job adverts had the perfect candidate as being aged 21 – 25, Bachelors degree and 6+ years experience in a corporate environment. The math just didn’t add up unless you started your degree plan at before you were 13.

——————————————————–9————-
As recruiters who have filled numerous Remedy positions in IRAQ and elsewhere we have tried to always be responsive to the needs of the client and the realities of the talent pool. The external recruiter’s role does not stop with the resume.

With respect to the current thread, there is a real clue re the client’s mind set and/or lack thereof, when they use the word “Permanent” in their job description. How do you spell “law suit?”

There are no “permanent” jobs out there.

* Contract positions or
* Employee positions…

Time for a reality check. We expect to be looking for “Senior Remedy Engineers” for both Afghanistan and Iraq…Anyone interested?

Happy Holidays

Sincerely,

Jeff Glaser
INVIZCORP
703-729-3382
——————————————————–10————-
Do the Afgan and Iraq positions come with weapons training? Haven’t fired a Mark 19 in a while but I’m sure the mechanism hasn’t changed would love to renew the qualification though lol

——————————————————–11————-

Someone actually mentioned age as a desirable quality in a job posting? That would be discriminatory.

————————————————————12——–
If you had issues with the weapon.. would you check active links or filters to see why it’s not firing?

————————————————————–13———-
Lol Is it Friday already?!?! That was a pretty good one.

————————————————————–14———-
Active links, since the trigger is executed by the user action.

Rick
————————————————————–15———-
But that weapon is an automatic so you would need to check filters as well if the first round went off but then misfired on the next firing order. Maybe even check API logging of the belt stopped feeding correctly.

————————————————————–16—–
I would have an escalation throw out a grenade every 5 minutes. RUNIF: weapon jams.. J

I’d stick around Tommy since you already had weapons training… unless, of course, you trained with Dick Cheney.

.—————–TTTT_—–_______
/”””””(______O] ———-____ \______/]_
__…—’”"”\_ –” Q ___________@
|”’ ._ _______________=———”"”"”"”
| ..–”| l L |_l |
| ..–” . /-___j ‘ ‘
| ..–” / , ‘ ‘
|–” / ` \
|__’ \ -
- ‘-.
‘. /
‘-./

————————————————————–17—–
You could also add in an exclusion in the Runif clause just to be on the safe side If $USER$ != “dchene1”

Nice AK. You know I think that symbol art is coming back en vogue,

————————————————————–18—–

What would be the client type? Unknown?

————————————————————–19—–
Client type would be terrorist or freedom fighter depending on who was holding the UI.

Escalations would be no good unless you happened to be testing something when the enemy was in line with the weapon that was firing at the given time or interval!

Filters would be no good because of the network lag between the client and the server by the time the result computed fire, the target had moved out of the kill zone!

Sorry guys and girls but always ends up with some grunt holding the weapon and firing the trigger.

Rob

————————————————————–20—–
Your right Rob. The “grunt” part.

As it turns out Joe was spot on about the position “gas station attendant”.

I haven’t see the wage that was offered, since I worked with the old UNIX client.

Remember… that was before we had Active Links…

————————————————————–21—–
You could have actions like Change Fields (of fire), Open Window (for grenades), and Call Guide (for arty).

Rick
————————————————————–22—–
Don’t forget to include an active link guide for autofire.

‘threats’ > 1 AND ‘LastThreatEliminated’ != “Yes”

SQL Statement Set Field
SELECT MIN(TargetDistance) FROM CURRENT_BATTLEFIELD.FIELD_OF_FIRE WHERE TARGET_STATUS=’ALIVE’
SET FIELD ‘ThreatDistance’ = $1$

If ‘threats’ > 1
PERFORM-ACTION-PULL-TRIGGER “‘ThreatDistance’”

On a serious note. If you’re looking for a contract, go for Iraq before Afghan. They’re trying to pay people the same amount of money for both places. Left Iraq 6 weeks ago. No way I’d go to Afghan for the same pay. (Living conditions are worse, more time off to sit around and do nothing(very boring), and we got almost no incoming at Victory in Baghdad.)

As far as the Iraq posting. It says ARS 6.3 but that description is 4 years old. It’s 7.1, ITSM 7.0.3. 7.5 is probably never going to happen there. But if you you’re looking for a new contract and want to get paid pretty good to learn ITSM 7 and get some experience with 7.1 (that’s why I went) then send Jeff Glasser your resume.

Jason Bess
Remedy Developer/Consultant
Bess Development Corporation
(My position is the one they’re back-filling in Iraq right now. I won’t lie, it sucked being there. But the $95k tax exclusion, massive paychecks, and experience were unbeatable.)

————————————————————–The End–

请问16楼贴出的是何物?哈哈:)

资产CI的一生

在ITIL v3以后,配置管理进化为“服务资产和配置管理SACM”,换句话说,资产和配置管理不分家。两个流程应该是融合的。从微观上看资产管理设计到CI的所有生命周期状态,而这个服务资产在CMDB中出现的状态为整个生命周期中的一部分。

最好能通过资产管理为统一入口,来完成对CMDB中资产的生命周期管理。例如:一台服务器在到货以后,完成资产入库后,就应该在CMDB中自动创建CI,在上架部署了软件后,有配置资产自动采集工具,采集回详细配置信息后,资产状态就自动变为“部署”,当在运行维护中服务器宕机或者维护时,在资产管理中也能看到更新的信息。下面是建议的服务资产的生命周期状态:

编号 状态名称 状态描述
1 到货 表示为CI的物品在采购以后,被相关部门签收。
2 组装 设备的组件在被组装的过程中
3 维护 该设备处于宕机后的维护状态
4 宕机 该设备处于宕机状态,还未对其进行维护
5 终止 不在处于被部署的状态
6 转移 该设备正在被转移到其它的地点或者机房途中
7 删除 配置项被标记为删除状态
8 库存 设备处于库存中,还没有被部署
9 借出 已被其他单位或者部门借走
10 处理 该设备已经被拆卸,其本身已经不可用
11 保留 该设备已经被某单位或者部门预订,已经不再库存中了
12 返厂 由于设备已经被损坏或者过保,必须被退回厂商
13 部署 CI的默认状态,表示设备处于正常的生产运行状态
14 订购 该设备已经被订购,还未到货,仍然不可用

配置项管理和资产管理的联系和区别。

Service Asset and Configuration Management (SACM) = Configuration Management + Asset Management

Configuration Management
@The Process responsible for maintaining information about Configuration Items required to deliver an IT Service, including their Relationships
@This information is managed throughout the Lifecycle of the CI

Asset Management
@Asset Management is the Process responsible for tracking and reporting the value and ownership of financial Assets throughout their Lifecycle.

Remedy ITSM 7.6 installation Tips

自从7.6发布和以后一直没有时间安装,通过最近的几次安装,积累了一些经验,供大家参考。在安装开始之前请一定查看ARS_7500_Comp_Matrixv1001.pdf文档,保证操作系统、数据库、中间件和JDK的版本都符合要求。如果是安装生产系统的话,建议把数据库和应用服务器分开,硬件配置也一定参考Remedy ITSM安装手册中的建议硬件配置要求。

最近在Linux的虚拟机上做了一次安装,相关细节如下:

  • Suse Linux Enterprise server 10 sp2 64 bit
  • Oracle 10G 64bit (10201_database_linux_x86_64.cpio.gz)
  • JDK 1.6(jdk-6u6-linux-i586.bin)

在Suse Linux上安装Oracle还是比较容易的,可以参考这个安装手册进行,下载。数据库安最好按照成utf8字符集,如下图所示:

utf8

Remedy ITSM套件的安装分为三个步骤:1)ARS 7.5 SP3 的安装;2)Atrium CMDB7.6安装;3)ITSM 7.6安装;其中第一步是最重要的,第二步骤如果安装产品目录数据的话时间花费比正常多一点。Remedy ARS 7.5是最新的补丁包,它修复了sp2的很多bug;是Remedy ITSM 7.6安装的必须版本。在安装ARS的时候需要准确的导出相关的环境变量,如果环境变量没有或者不够的话,安装程序则无法正确地连接数据库,下面的例子可以参考一下。

snap00143

每一步安装完成之后都需要详细查看相关的日志,确保每一步都安装完全正确。在安装完ARS之后一定要为服务器添加所有相关License。

2012

妹妹问:那么2012年的奥运会还办不办了?无语…..这个电影中有很多情节与中国相关,特效不错,这可能是吸引人去电影院看的原因吧。

特效太牛 世界在你眼前毁灭(组图)
特效太牛 世界在你眼前毁灭(组图)

这个电影倒是让人对玛雅文化产生了兴趣,有空可以看看。