Category: Network & Server (網絡及服務器)

二手電腦市場的高端垃圾

By admin, December 10, 2015 22:25

竟然發現了Equallogic的蹤跡,當然已經是很舊很舊的型號了。 但是如果沒了Firmware,就等同一塊廢鐵般Useless。

IMG_0551

這個Controller更舊,完全不知道是什麼型號。

IMG_0550

Windows Server 2012 R12 and Windows 10 on ESX 4.1!

By admin, October 31, 2015 22:22

Well, you didn’t mis-read the above! Yes, I finally managed to get both (W2K12R2 & Win10) running under the old daddy VMWare ESX 4.1 with the latest VMTools installed, not supported? Huh? You must be kidding me.

w2k12r2

1. Basically, in order to run your OEM copy of Windows Server 2012 R2, you will need to select Windows Server 2008 R2 as the OS template. Also you need the latest SLIC 2.3 ROM, the correct Dell Cert and of course a valid OEM Key.

2. De-select the default video driver (ie, WDDM) when installing VMware Tools or you will get a black screen immediately. At least this is true on Windows 10, but somehow no problem with W2K12R2. Details please refer to this blog article. (Update: actually you don’t need to install VMware Tools here)

3. Still, you will find the mouse isn’t working smoothly in W2K12R2 and Win10, this happens to both Windows Server 2012 and Windows 8 as well, and the solution is simple, download and install the latest VMWare Tools which comes with the updated drivers for video (VMware SVGA 3D), disk controller (PVSCSI) and network cards (VMnet3).

win10

4. Again, after you have successful upgraded your VMWare Tools, then you will need to create a 1MB hard disk and select the SCSI to 1:0 and change the secondary controller type to Paravirtual, restart the VM, shut it down, change the primary hard disk controller to Paravirtual as well, finally remove the 2nd disk and controller. Viola, there is your lightening fast PVSCSI disk!

5. The other things I discover W2K12R2 and WIN10 keeps crashing for every 3-5 hours without any reason, then I found this KB which solved the problem, and make sure you applied all the windows updates.

6. Another tips is to turn off the Sleep Mode under Power Option in Windows 10, or you will face VM constantly went to sleep and hence VMTools status always shows “Not Running”.

7. Finally I discover you can install the latest Linux CentOS 7.x and Ubuntu 15.x without any problem on ESX 4.1 although it’s not listed as supported OS…strange, but working perfectly fine which leads me to think we can in fact install any updated OS on the much older ESX 4.1. One hint is to download the latest VMTools and install it! (Actually you don’t need as somehow CentOS 7-1611 comes with VMTools automatically somehow)

8. I also noticed those Linux VMware Tools status shows as “Unmanaged”!  That’s actually ok, as the tools is installed from the latest package instead of using the default attached CD-ROM (which the version doesn’t work anyway), so you can safely ignore it.

So who said these two latest OS from Microsoft aren’t supported on ESX4.1? Think again. :)

Update: May 15, 2017

Tested the latest CentOS 7-1611 also worked perfectly on ESX4.1.

Update: Oct 10, 2017

Problem found W2K12 constantly hangs, finally identified it’s the old anti-virus program Symantec Endpoint Protection that’s causing the conflicts, you will need the version at least v14.0.2415 in order for the OS to be stable.

Update: Dec 25, 2017

It turns out Windows Server 2016 follows exactly the above step and I can confirm W2K16 is running happily on ESX 4.1 without any problem! Except you need to have SLIC 2.4 BIOS!

Dell purchase of EMC should set off alarms

By admin, October 13, 2015 13:56

姣婆守唔到寡…

MW-DW242_dellem_20151012170053_ZH

Dell Inc. founder and Chief Executive Michael Dell, right, and EMC Corp. CEO Joseph Tucci shake hands in an image provided by Dell after the merger of the two tech companies was announced Monday morning.

Dell Inc. is making its biggest move ever to expand beyond its personal-computing roots and compete directly with Hewlett-Packard Co.’s corporate business, buying EMC Corp. EMC, +1.76% But there are worrisome aspects to the largest tech deal in history.

One is the hefty debt load privately-held Dell is taking on in order to do the deal. The company expects to pay for the deal with cash on hand, a debt issuance and through the creation of a stock that will track Dell’s ownership interest in EMC’s virtualization software business, VMware Inc. VMW, EMC shareholders will receive $24.05 per share in cash and approximately $9.10 per share in the newly created VMware tracking stock, which didn’t seem to please VMware investors: While EMC’s stock ticked up slightly on the news, which was first reported last week, shares of VMware fell 8% Monday.

Dell hopes to pay down some of the debt through cost-cutting and the elimination of duplications and redundancies in the company. Michael Dell, the CEO of the company he founded in his college dorm in 1984, assured investors Monday the company was not taking on more than it could handle, even amid a threat of potential rising interest rates.

“I think what you’re going to see is in the first 18 months to 24 months, a significant de-leveraging coming from some cost synergies,” Dell told reporters on a conference call. ‘We have revenue synergies that are three times larger.”

Executives, though, declined to be more specific about what areas could see cuts or restructuring, preferring to focus on the more amorphous “revenue synergies,” which they told analysts were about $1 billion.

Analysts were not too keen on the idea that the companies would be looking to issue debt in an environment of rising interest rates.

“We still believe raising $33 billion plus in debt at reasonable interest rates will be challenging (but not impossible) for Dell,” Jeffries & Co. analyst James Kisner said .

Sanford Bernstein analyst Toni Sacconaghi said in a note on Monday that he believes Dell will have to raise about $45 billion in debt to finance the deal and that he was “a bit surprised that Dell was able to get financing,” according to the Wall Street Journal.

Meg Whitman, the chief executive of Hewlett-Packard HPQ, +0.00%  believes Dell is going to face an ominous task raising that much debt, and she hopes H-P can take advantage of the confusion among customers as the companies embark on this massive deal.

“To pay back the interest on the $50 billion of debt that the new combined company will have on their balance sheet, Dell will need to pay roughly $2.5 billion a year in interest alone,” Whitman said in a company-wide email to employees obtained by MarketWatch. “That’s $2.5 billion that they will allocate away from R&D and other business critical activities, which will keep them from better serving their customer.

While Whitman’s comments can be seen as self-serving, H-P has its own experience with big mergers that sucked up its cash, notably the $11 billion deal for software company Autonomy, most of which it later wrote off. H-P also wrote down a huge chunk of its $14 billion acquisition of EDS, a computer services company, both moves that H-P did in a similar push for enterprise-focused businesses.

Whitman, whose tenure at H-P started with a mandate to strengthen the company’s then-weakened cash balance, contended that the company is “two years ahead of the game,” as it prepares for its own separation of its corporate server business from its printer and PC business at the end of this month.

“We’re organized, we have a strong balance sheet and our innovation engine is humming,” Whitman wrote. “So, get out in front of your customers and your partners. Tell them our story. Take advantage of this moment.”

In addition to the hefty debt load Dell is going to be saddled with, the company is going to have to again publicly report its financial results, as a result of its new tracking stock. EMC Chief Financial Officer Zane Rowe told analysts on a conference call that along with the tracking stock, “we would expect Dell to report financials.”

“We’ll become an SEC registrant and will report financials on their business as well as the VMware business,” Rowe said.

So in addition to adding on a pile of debt, Dell — which seemingly enjoyed being out of the public limelight as a private company — is now going to be foisted into the public glare again. At least investors will be able to track its progress in this mega-merger, but it’s unlikely to be an easy road.

(Market Watch)

Disable Windows 7 Startup Repair as Default Option

By admin, September 3, 2015 16:20

This really came handy and got rid of that annoying useless repair mode after a power outage.

at CMD, type:

bcdedit /set {default} recoveryenabled No
bcdedit /set {default} bootstatuspolicy ignoreallfailures

Cleaing up Those Huge MSSQL Log Files

By admin, August 17, 2015 12:21

Today, one of my clients has complained his server is running out of space abnormally, using WinDirStat, I was able to identify the cause of the problem.

It was the MSSQL log files occupied over 20GB of space. The clean up process is pretty straight forward, manually run “EXEC sp_cycle_errorlog” 6 times or more depending how many log copies you kept, the command erased all those gigantic log files and freed up the space as you wished for, simple as that.

There is always something new for me to learn everyday, which is a good thing! :)

Note: Struggled a bit trouble when login back to Mirosoft SQL Server Management Studio, as the correct format for Server Name is /your_server_name/SQLEXPRESS.

IIS HTTP Stopped Taking Request and Connections_refused

By admin, July 11, 2015 11:40

Recently, one of the web server suddenly stopped from taking any request, restarted IIS WWW service won’t help, and there is no W3WP.exe in the process at all! Everything else seems normal, of course restarting the whole server helps, but it will happen again in a few months, so this is not the permanent solution.

Then I found out there are tons of “Connections_refused” entries are logged in the Httperr.log, it turns out the server has run out of non-pool memories.

Work around for this issue is to add the EnableAggressiveMemoryUsage registry entry to the following registry subkey:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\HTTP\Parameters

Then, set the EnableAggressiveMemoryUsage registry entry to 1.

To do this, follow these steps:

  1. Click Start, click Run, type regedit in the Open box, and then click OK.
  2. Click the following registry subkey:
    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\HTTP\Parameters
  3. On the Edit menu, point to New, and then click DWORD Value.
  4. Type EnableAggressiveMemoryUsage, and then press ENTER.
  5. On the Edit menu, click Modify.
  6. In the Value data box, type 1, and then click OK.
  7. On the File menu, click Exit to exit Registry Editor.
  8. Restart the HTTP service. To do this, follow these steps:
    1. Click Start, click Run, type cmd in the Open box, and then click OK.
    2. At the command prompt, type net stop http /y, and then press ENTER.
    3. At the command prompt, type iisreset /restart, and then press ENTER.

By default, the HTTP service in IIS 6.0 stops accepting connections when nonpaged pool memory reaches 20 MB. When you enable the EnableAggressiveMemoryUsage registry entry, the HTTP service stops accepting connections when nonpaged pool memory reaches 8 MB.

Finally A New Breed of Entry SAN from Dell !

By admin, May 8, 2015 13:50

DELLSCv2020

After reading several SCv2000 reviews, I found it’s simply an upgraded version of PowerVault, so I seriously doubt the performance is even near Equallogic PS4100 series.

Quote from StorageReview:

The Dell Storage SCv2000 Series is a customer-inspired series of entry-level storage arrays that offer same common management and several of the core features as higher-end Dell SC Series arrays, such as the SC4020. According to Dell, the SCv2000 Series offers the “best performance and protection in its class with integrated data protection to support specialized projects, database and test environments, or simple storage consolidation.” The new arrays enable customers to standardize on a common platform, saving time and money. The SCv2000 Series comes in three models with expansion options: the SCv2000, SCv2020, and SCv2080

Benefits include:

  • High performance at an affordable price – The arrays deliver best-in-class performance in a single, affordable 2U enclosure. Feature-rich options include proven data protection features, RAID tiering to optimize capacity, thin provisioning, flash support, data-migration services, and multi-protocol connectivity. Granular data protection allows up to 2,000 snapshots and 500 replications.
  • Integrated data protection- Remote Instant Replay, Local Instant Replays and Replay Manager along with RAID tiering that optimizes SAN capacity. Tight integration with common application environments, such as Microsoft and VMware, help to simplify virtualized data centers, allowing local and remote data protection features to take consistent snapshots of virtual machines without sacrificing performance.
  • Future flexibility with Storage Center – Customers can gain more value from existing investments with data migration to higher-tier Dell Storage SC4000 and SC8000 Series arrays. The SCv2000 Series supports today’s needs and future growth as the arrays can be managed with the same, single user interface as other SC Series arrays. Customers can scale capacity when needed with the benefit of no capacity licensing and choose from a broad range of hard drives and SSDs, configured for a variety of applications.

SCv2000 Series specifications:

  • Models: SCv2000 | SCv2020 | SCv2080
  • Internal Storage: 12 x 3.5” drive bays | 24 x 2.5” drive bays | 84 x 2.5” or 3.5” drive bays
  • Supported expansion enclosures:
    • SC100: 12 x 3.5” or 2.5” drive bays | SC120: 24 x 2.5” drive bays | SC180: 84 x 2.5” or 3.5” drive bays
    • SC100: 12 x 3.5” or 2.5” drive bays | SC120: 24 x 2.5” drive bays
  • Maximum drive count:
    • 168 (12 internal, plus 156 external) |168 (24 internal, plus 144 external) | 168 (84 internal, plus 84 external)
  • Total storage capacity: 504TB
  • Supported drive types:
    • HDD: 7.2K RPM | 15K, 10K, 7.2K RPM | 10K, 7.2K RPM
    • SSD: write-intensive, read- intensive (different drive types, transfer rates and rotational speeds can be mixed in the same system)
  • Controllers: Single or dual controllers | Single or dual controllers | Dual controllers
  • Processor: Intel Xeon 4-core
  • Memory: 8GB per controller
  • Network/server connectivity (front-end):
    • 2 x 16Gb FC ports per controller
    • 4 x 8Gb FC ports per controller
    • 4 x 1Gb iSCSI (BASE-T) ports per controller
    • 2 x 10Gb iSCSI (BASE-T) ports per controller
    • 4 x 12Gb SAS ports per controller
  • Internal drive connectivity (back-end): 6Gb SAS ports (2 per controller)
  • Product OS: Storage Center 6.6.2
  • Server OS:
    • Microsoft Windows Server
    • SLES
    • VMware
    • Citrix XenServer
    • Red Hat
  • RAID: Supports RAID 5, 6, RAID 10 and RAID 10 DM (dual mirror)

Third Equallogic Disk Failure

By admin, April 30, 2015 11:38

This is the 3rd time a 15K SAS failed, not bad actually giving the long time period of 4 years and 6 months (The first was in December 12, 2012 and 2nd was in Jan 11, 2014), and this time the reconstruction took approximately 4 hours to complete.

12321312

First Encounter of HA Failover

By admin, April 29, 2015 17:12

Found one of the hosts performed HA Failover on its own at midnight today and all its associated VMs were restarted on the other hosts automatically. The exact cause of host restart is still under investigation as there is no hardware failure found at all.

12:17 Host is Not responding to vCenter Ping, so it triggered HA Failover. In fact, vCenter took about 50 seconds to realize the actual host failure.

12:24 It took 7 Minutes for the host to re-join vCenter cluster. In fact the host & ESX restart only took about 5 minutes counting from the boot screen.

12:28 Everything went back to green, the whole process took about 10 minutes. For individual VM, there was 5-6 minutes of downtime unfortunately.

Cluster Level Event Log

cluster

Host Level Event Log

host

有意思! 再用Power,你就Low了 (轉文)

By admin, April 28, 2015 10:23

要说这位嘉宾的来头可不小,他是VMware大中华区高级业务拓展经理, 新一代关键业务云平台解决方案总监王俊标。来自VMware的资料显示——在加入VMware之前,他曾在中国银行,IBM 中国工作。是IBM灾备红皮书作者之一(1999年,美国奥斯汀)。拥有丰富的IT整体架构,数据中心规划经验,熟悉金融,电信,政府等行业。

话不多说,摘抄了演讲中比较有意思的几个梗,分享给大家。

VMware的由来

在1998年的一天,IBM有个项目经理说,目前Intel的计算性能足够好,很多CPU的时间空着,我们看看能不能把空余的时间用起来。他就创建了个项目,就请了伯克利大学一个教授叫做Mendel Rosenblum带着两个研究生,开始研究在大机上的虚机技术能不能够在Intel这样当时所谓低端的服务器上创建虚机。教授和研究生非常了不起把这个项目做出来了,虚拟花费半个小时启动了,项目经理验收通过了。沃森,很好的项目,付钱,抽屉里一放。然后就没然后了。

这个教授很郁闷,回去跟他太太讲,他太太叫Diane Greene。Diane Greene和一个中国人叫做Edward Wang正在找项目做。“我们就把这个项目做起来吧”,在1998年他们在一个有缝隙的房子里创建了VMware公司。

IBM倒贴15亿美元卖掉芯片业务

没想到有一天将这么厉害的芯片卖给了一家叫做GlobalFoundry的公司,我专门去查了一下这家公司,原来它是AMD分拆出去一家专门做代工的公司。我就挠头,这件事情基本就是个信号告诉客户,P可能接下去是很难,这件事情意味着很多很多。

一语道破12306危机本质

在互联网冲击下,现在用户量增长这么快,碰到了结构僵化,没有办法扩展,灵活性太差,还很贵,还没有未来。原来是Power8、Power9,按照一年半就出来,现在说没有未来。面对互联网的压力,原来跑得好好的应用,跑了这么多年的应用,在主机上撑不住了。很多客户告诉我,突然间走向的公共服务,铁道部在12306面向互联网卖票,这个架构一定是因为本身不是这样设计的,甚至是基于大机主机的应用架构也碰到这样的问题,因为当接入互联网的时候,它的业务增长已经是无法预测,不是5倍、10倍,可能是100倍,甚至于1000倍,铁道部要安12306,原来全国可能算的一个5000个网点排队在那里,不会有超过5000个并发,因为就是那几个人在那么卖票,最多是买票的人辛苦一点,可是基于互联网以后第一次有20亿的点击,所以这个系统会撑不住”。

跟POWER比,我都不好意思

说虚拟化和性能下降太厉害,这件事情反复讲,再三讲,这件事情是怎么理解,性能会损耗,但是物理x86和虚拟x86会损耗6%左右。现在拿先进的、快的、便宜的至强的x86芯片跟老的贵的POWER5、POWER6去比,每次比都不好意思,每次随便你跑Oracle DB2,都比你块5倍、10倍、100倍,你老说性能差,差在哪里,怎么差?这是一个误区。

我们是文明的拆迁办

说迁移太影响我现有的系统要花很多努力,这也是不对的。因为我们是文明的拆迁办,我经常是这样说,是文明的给你房子,但是不拆迁。认为我的新平台搭好之后,搭好的那一天就把老系统给拆掉了,没有这回事。老系统继续跑三年、五年是可以的,但是新平台搭好,你跑。有一个四川电信2009年开始跑到2011年,终于得出来一个结论,虚拟化是信得过的,x86是可靠的,甚至比Power更可靠。接下来两年之类把所有的贵的POWER全部搬走,全部跑x86。没有说搭那一天,老房子就不给你住了,不存在这种问题,所以根本不存在搬迁不搬迁的工作,全部东西都是新的,Oracle都是Linux的,所以没有这回事。

回應: VM家经理别闹了,人家POWER就是要low到底

据说前天有个VMware家的经理(就是食人族最喜欢吃的那种经理)在一个发布会上呐喊:再用POWER你就low了!这位经理童鞋的例证有三个,都很有趣,但不是那种正确的、有内涵的有趣,而是破绽百出、明眼人一看就受不了的那种有趣,这真不是我说话刻薄,接着往下看就知道我这么说着实还挺厚道的。

关于IBM倒贴15亿美元卖掉芯片业务

经理说,“没想到有一天将这么厉害的芯片卖给了一家叫GlobalFoundry的公司,我专门去查了一下,原来它是AMD分拆出去一家专门做代工的公司。”

经理就挠头了,得出结论是POWER就没有未来了。

别闹了,你都知道POWER是“这么厉害的芯片”,一个代工厂还去接这个芯片业务,人家GlobalFoundry活腻啦?明明出售的是“芯片制造业务”,经理非要把这个“制造”二字给忽略,我必须严肃地说这个错误犯得太low了!人家耐克没有制造工厂,按您这个说法耐克许多年前就没有未来,应该死翘翘了呀?

人家IBM说投资30亿做7nm工艺的芯片、神经元芯片、碳纳米管芯片等,这个计划可从来没有变化过,切记!

关于POWER很贵、没未来

经理说:“(POWER)结构僵化,没有办法扩展,灵活性太差,还很贵,还没有未来,原来是POWER8、POWER9一年半就出来,现在说没有未来。”

别闹了,跳票可从来不是IBM的范儿,从2004年的POWER5到2013年的POWER8,这一路从未有过啥意外,不知道这“一年半”的说法,经理是从哪里听来的,真的属于很low的谎言。
而且,恐怕经理还得打自己的脸两下,人家POWER9还是会准时出现在大家面前——在11月18日的第44届全球超级计算机TOP 500公布时候,透露了一些关于POWER9的技术细节,说进一步强化加速器,也将是第一个可通过NVLink总线互联的处理器架构,带宽高达80-200GB/s,而且延迟和功耗都将进一步降低等等——这话可不像经理一样乱说的,人家POWER的未来已经到来,您就别瞎放炮了。

不过,经理说的有一点是歪打正着——POWER真的low了,而且一门心思想要low到底,例如有个OpenPOWER基金会您造吗?就是去年8月IBM联合Google、NVIDA等5家公司成立的专门基于POWER平台进行开放创新的组织,到10月底已经有65家成员了,就是为了让POWER能够low到完全覆盖x86服务器市场。

你看这一Open,入门的门槛确实low了,用户选择也多了,以后POWER服务器可不再是IBM一家的,会有很多供应商出货Power服务器,比如泰安的Power服务器上个月已经开始订货了。另外,IBM还跟北京市经信委和华胜天成成立合资公司,主要业务就是搞POWER服务器,很快还会有中兴、浪潮等推出POWER服务器。就连POWER芯片,也不是IBM一家有,远的不说,中晟宏芯的POWRE芯片可是快来了,具体产品路线图白纸黑字宣布了:第一代产品将于2015年12月推出,12核心,对标英特尔E5-2690;第二代产品将于2017年12月推出,集成自主的浮点运算单元,对标英特尔E5-2620/2650。

门槛low了的同时,POWER的价格也必然会low下去。对嘛,就是要Low到x86市场去,让用户以亲民价格继续享受小型机的RAS性能。再有拿贵说事儿的,先去询一下泰安的POWER服务器价格咱们再讨论论吧。

还有,如果经理硬要说x86比POWER可靠,那这就超出技术和业务讨论范围,只关乎情绪,就不好弄了。

关于性能:5倍10倍100倍

经理提到一个事实,说拿新的x86芯片跟老的POWER6比,“每次都不好意思,随便你跑Oracle、DB2,都快5倍、10倍、100倍,你老说性能差,差在哪里?”

这个事情,的确是心有花则见花、心有沙则见沙的事情,我想用这几天很热的一篇文章的标题来说“国产大飞机,你敢坐吗?”不用多说吧?还有,咱们的“天河二号”在最新的全球HPC TOP 100中又夺得冠军了,貌似三连冠了,你能说中国的HPC系统比美国的HPC系统先进吗?

再多说一句,别拿2014年比2010年啦,比2013年的POWER8吧——22nm,12内核,4GHz频率,内存带宽230GB/s,利用率高达65%,数据吞吐量是x86服务器的两倍,内置加密引擎技术,使关键应用和数据可以放心地放到云上。。。。。。嗯,POWER的确不全low,这些特性只能用“High”来描述。

想起一个前几天的段子——听说某省电信运营商把核心系统迁移到x86系统后,曾经吸引了很多人眼球,但现在常常因故障率过高被扣奖金。这不就是疤瘌眼照镜子嘛,你说low不low?冷静想想,世界上哪里有最好?只有合适不合适,客户了解自己和供应商,知己知彼,然后选择适合自己的技术才是最明智的,才会让行家说low。

关于两个破词儿:Scale up和Scale out

经理说,POWER没办法扩展。

别闹了,这都是陈年老调了,经理作为大V家的一员,不应该停留在历史中。POWER服务器早就既能纵向扩展Scale up也可能横向扩展Scale out了,既有scale up的大系统,也有scale out的小系统。随着POWER8的推出,在性能、RAS和性价比方面都大幅提升,例如4月份推出的首批5个基于POWER8的全新Power服务器,就是专门为大规模scale out计算环境设计的,一两个插槽这种事早就不是个事儿了。

今天的POWER,应用门槛儿的确是low了,例如支持Little Endian,所有的Linux应用可以直接跑在Power上;另外还支持OpenStack方案中最为广泛使用的操作系统Ubuntu,够屌丝够low。

另外,虚拟化成本也low了,因为支持KVM虚拟化了。这个可以说是点中了VMware的罩门,怪不得V家经理急了眼胡言乱语呢。

关于12306危机是主机造成的

经理说,“12306危机的本质是面对互联网的压力,原来跑的好好的应用,在主机上撑不住了”。

别闹了,您能稍微严肃点吗?我的意思是说您能举个稍微靠谱的、不让圈内人说你low的例子吗?照您这说法,12306换一堆x86服务器问题就解决了?业界讨论已经很多了,12306这是scale out和scale up都很难解决的问题,Alibaba技术团队不是雄赳赳气昂昂进驻后灰溜溜铩羽而归了吗?再说了,12306后端用的明明是RISC小型机,您好歹是大VMware家的经理,肿么跟那谁谁一样把小型机叫主机啊?唉,压根儿就不是这么个角度的问题,建议经理百度一下,网上有大量深度技术剖析文章说这个事情,我懒得说了。

关于可怕的分布式架构隐患,八卦一下那位马师爷的双十一,某业内人士评价说:“当然马云关掉退款功能不是为了冲业绩,500多亿打个折扣也是惊人的,但是分布式架构的CAP难以三全的问题是个技术框架的问题,没有万能的架构,分布式当然也不是。”好奇的童鞋可以自己去查原文。

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