مروری بر سازگاری تکثیر داده در سیستمهای توزیع شده
الموضوعات : فناوری اطلاعات و ارتباطات
1 - مدرس دانشگاه
الکلمات المفتاحية: تکثیر داده, سازگاری, مدلهای سازگاری, سیستم توزیعی, ابر, گرید داده,
ملخص المقالة :
سیستمهای توزیع شده مانند گرید و ابر به منظور مواجهه با مشکلات کارایی، تضمین کیفیت سرویس و افزایش دسترسیپذیری به دادهها از تکثیر داده استفاده میکنند. تکثیر با وجود مزایای بسیار هزینههای مدیریتی نیز به همراه دارد. سازگار نگه داشتن تکثیرها از جمله مهم ترین هزینه های ناشی از تکثیر است. تعادل بین هزینه سازگاری تکثیر و مزایای تکثیر یک موضوع مورد بحث و داغ در بین محققان این حیطه است. لذا توجه به سازگاری تکثیر نقش موثری در کارایی این سیستمها بازی می کند. استراتژیهای بسیاری توسط محققان در حیطه سازگاری تکثیر داده ارائه شده است. هر کدام از این استراتژیها با در نظر گرفتن پارامترهای مختلفی مانند نرخ خواندن، نرخ نوشتن، نرخ تحمل دادههای قدیمی، تعداد تکثیرها و پهنای باند ارتباطی در تعیین سطوح سازگاری تکثیرها سعی در کاهش هزینههای سازگاری و ارائه راهکارهای مؤثر در این حوزه دارند. در این مقاله به مفاهیم تکثیر و سازگاری تکثیر پرداخته می-شود. دستهبندی ها و روش های سازگاری موجود در این حوزه بررسی می شود. کارهای انجام شده در حیطه سازگاری تکثیر داده از دیدگاه های مختلفی مانند نوع سیستم، پارامترهای تصمیم گیری، ابزار شبیه سازی، مدل سازگاری و پارامترهای بهبود داده شده مقایسه می شوند. همچنین در پایان، موضوعات باز در این حوزه مطرح می شود.
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