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موضوع: قبل از خرید سرور مجازی بخوانید

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  1. #1

    قبل از خرید سرور مجازی بخوانید

    سلام .

    امروز می خواهم در مورد تفاوت مجازی ساز ها صحبت کنم ، خیلی از عزیزان ( عموما مبتدی ) با دیدن قیمت پایین دست پاچه می شوند و گول می خورند .

    ببینید ، در حالت کلی مجازی ساز ها به 2 دسته تقسیم می شوند

    1- مجازی ساز ها با منابع اختصاصی
    2- مجازی ساز ها با منابع اشتراکی


    مورد اول برای کاربر مناسب هست
    مورد دوم برای مدیر سرور مناسب

    زمانی که مجازی ساز منابع اختصاصی باشه ، مدیر سرور نمی تواند بیشتر از حد مجاز و توان سخت افزاری سرور کار بکشد . یعنی اگر سرور 8 گیگ رم داره ، نمی تواند 9 گیگ رم به سرور های مجازی اختصاص دهد .

    اما اگه منابع اشتراکی باشه ، مجازی ساز این اجازه را می دهد که بی نهایت رم و سی پی یو اختصاص بدهید ، تا زمانی که مقدار استفاده کاربران زیر مقدار 8 گیگ ( حداکثر میزان منابع واقعی سرور ) هست مشکلی نیست و همه راضی هستند و خوبه ، اما یک زمانی میشه استفاده ها بالا میره و کاربران می خواهد از حداکثر منابع تخصیص داده شده استفاده کنند ، در نتیجه مقدار استفاده از اون 8 گیگ یا هر مقدار دیگه بالا میزنه و ......

    سرور نابود میشه .

    از جمله مجازی ساز ها با منابع اختصاصی :

    1- VMware ESX / ESXi
    2- Microsoft Hyper-V
    3- Citrix XenServer


    بررسی مجازی ساز های با منابع اختصاصی !

    Citrix XenServer

    تنها نکته منفی در مورد مجازی ساز Citrix XenServer هست ، مشکل که هم در XenSource هست و هم در Citrix XenServer . ، هارد دیسک های vPs ها و خود سرور بسیار حساس و ضعیف هستند . به طوری که اگر vPS یا سرور در حالت هنگ باشه و یا فشار زیادی روش باشه و سرور یا vPs رو ریستارت کنید ،بالا آمدن این سرور و کرش نکردن سرور با خدا هست

    شایع ترین مشکل این هست و هر لحظه امکان کرش کردن HDD سرور و یا VPS وجود داره . دقت کنید که هیچ وقت دنبال این مجازی ساز نرید ، مگر اینکه از سرویس ها بک آپ بگیرید و یا RAID استفاده کیند

    Micorosft Hyper-V

    مثلا Hyper-V قدرت بالایی داره ، اما بیشتر از 4 Core برای سی پی یو نمی شناسد ، مثلا من 2تا CPU داشتم ، اما یکی رو شناخته بود . در ضمن از نظر امکانات ضعیف هست و باید Windows Server 2008 داشته باشید که نصب کنید ، که این عامل باعث میشه حداقل 25 دلار برای هزینه اش بپردازید .

    البته ARIA می فرمودند راهی هست که بشه از 2 CPU استفاده کرد . کلا Hyper-V قدرت بالایی داره مخصوصا در سرور های مجازی ویندوز .

    خوبی که داره این هست که شما به ویندوز دسترسی دارید می توانید فایل های ار VPS رو کپی و.. کنید .

    ولی پنل مدیریت قوی نداره ، خیلی خشک و ساده هست . برای اضافات نظیر پنل برای کاربران و یا پنل های قوی تر باید لایسنس خرید که از توان ما خارج هست .


    VMware ESXi

    من هر کسی که می خواهد مجازی ساز نصب کنه ، بهش VMware ESXi رو پیشنهاد می دم . خیلی ازش راضی هستم ، قبلا از Citrix XenServer استفاده می کنم ولی متاسفانه HDD دوام خاصی در این مجازی ساز نداره .

    پنل های تحت ویندوزی بسیاری دارد و کلاینت های بسیاری داره که به مشتری اجازه ریستارت کردن و.. میده .

    مدیریت بسیار دقیقی در میزان فرکانس CPU و RAM داره ، بسیار STABLE هست و شرایط سخت و لود بالا بسیار کمک می کنه

    میشه کارت صدا برای سرور های مجازی اضافه کرد .

    VMware ESX

    تمامی موارد در VMware ESXi در همین مجازی ساز هم صدق می کند با این تفاوت که سیستم عامل VMware ESX لینوکس بیس هست و از دستورات لینوکس می توانید استفاده کنید . فکر کنم RedHat Enterprise هست .

    همچنین پنل تحت وب داره .


    نکته قابل توجه این هست که سعی کنید از هر مجازی سازی استفاده می کنید ، حتما لایسنس FULL کنید ( آخرین پلن) که نهایت امکانات رو داشته باشید


    تنها نکته ضعیفی که در VMware ESX / ESXi میشه گفت این هست که در قسمت کارت شبکه های اضافه ( بهتره بگم Switch های اضافی ، زمانی که سرعت پورت ( UPLINK ) رو محدود می کنیم ، اما تاثیری نداره و نوسان قابل توجهی داره

    ای کاش این مشکل حل بشه و بشه سرعت رو محدود کرد برای هر VPS ، دیگه همه چیز تمام میشه


    از جمله مجازی ساز ها با منابع اشتراکی :

    1- OpenVZ
    2- VMWARE SERVER 1 & 2x
    رایج ترین و معروف ترین و مدیر سرور پسند ترین OpenVZ هست که میشه همه چیز رو Unlimited زد ، .

    پنل زیبا و فریبنده Hyper-VM هم به کاربر می دند و کاربر از این همه ICON هنگ می کنه و کف و خون بالا میاره

    از دید کاربر : دمش گرم ، ماه اول هوای ما رو داشت و این همه چیز میز داده بهم ، لامسب چقدر امکانات داره این پنل Hyper-VM


    در کل ، سعی کنید قبل از خرید مشخصات سرور + نوع مجازی ساز سرور رو با خبر بشید . حتی شده بگید عکس براتون بگیره .

    با دیدن قیمت کله پا نشید ، فرض کنید طرف میگه من VPS با رم 1 گیگ که قابل افزایش به 2 گیگ هست رو به شما میدم 15 توامان در ماه ،

    حال یک حساب سر انگشتی کنیم ، آشغال ترین سرور ها با رم 8 گیگ و گوره بابای CPU که اگه از OVH بگیری نزدیک به 150 تا 180 در میاد . ( با اون شبکه مسخره اش ) .

    اگه 8 تا VPS با رم 1 گیگ به قیمت 15 تومان بده ، میشه 120 تومان ، هزینه سرور چه طوری در میاد ؟؟؟

    دیگه بماند 512 تا 1 گیگ هم برای خود سرور نیاز هست .


    قیمت ملاک نیست عزیزان ، ،

    اما این وسط افرادی هم هستند که با همون OpenVZ دارن با مرام و معرفت کار می کنند و حواسشان به مقدار منابع سرور هست و بیش از حد ارائه نمی دهند ،

    کلا دوست ندارم این تاپیک توهینی به کسی یا شرکتی تلقی بشه ، اینا نظرات من بود و دانستنی هایی هست که خریداران باید اطلاع داشته باشند .

    افرادی هم هستند که برای تبلیغات به دلیل وسیع بودن شرکتشان جهت تبلیغات و ... ارزان می دهند .


    کلا توهین به کسی نباشه ، هدف فقط بالا بردن سطح اطلاعات کاربران بود

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