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1. ½éÉÜ

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1.Object£ºÓÐÔ­ÉúµÄAPI£¬¶øÇÒÒ²¼æÈÝSwiftºÍS3µÄAPI

2.Block£ºÖ§³Ö¾«¼òÅäÖᢿìÕÕ¡¢¿Ë¡

3.File£ºPosix½Ó¿Ú£¬Ö§³Ö¿ìÕÕ

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2. ±³¾°

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µ±Ç°CephµÄ×îÐÂÎȶ¨°æ±¾0.67(Dumpling),ËüµÄobjects storageºÍblock storageÒѾ­×ã¹»Îȶ¨£¬¶øÇÒCephÉçÇø»¹ÔÚ¼ÌÐø¿ª·¢Ð¹¦ÄÜ£¬°üÀ¨¿ç»ú·¿²¿ÊðºÍÈÝÔÖ¡¢Ö§³ÖErasure encodingµÈ¡£Ceph¾ßÓÐÍêÉÆµÄÉçÇøÉèÊ©ºÍ·¢²¼Á÷³Ì[1](ÿÈý¸öÔ·¢²¼Ò»¸öÎȶ¨°æ±¾) ¡£

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3. ¼Ü¹¹

3.1 ×é¼þ

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2.Monitor£ºÎ¬»¤Õû¸öCeph¼¯ÈºµÄÈ«¾Ö״̬¡£

RADOS¾ßÓкÜÇ¿µÄÀ©Õ¹ÐԺͿɱà³ÌÐÔ£¬Ceph»ùÓÚRADOS¿ª·¢ÁË

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2.RADOS Gateway£º¶ÔÍâÌṩREST½Ó¿Ú£¬¼æÈÝS3ºÍSwiftµÄAPI¡£

3.2 Ó³Éä

CephµÄÃüÃû¿Õ¼äÊÇ (Pool, Object)£¬Ã¿¸öObject¶¼»áÓ³Éäµ½Ò»×éOSDÖÐ(ÓÉÕâ×éOSD±£´æÕâ¸öObject)£º

(Pool, Object) ¡ú (Pool, PG) ¡ú OSD set  ¡ú Disk

CephÖÐPoolsµÄÊôÐÔÓУº

1.ObjectµÄ¸±±¾Êý

2.Placement GroupsµÄÊýÁ¿

3.ËùʹÓõÄCRUSH Ruleset

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1.CRUSHËã·¨£ºÒ»ÖÖÎ±Ëæ»úËã·¨¡£

2.OSD MAP£º°üº¬µ±Ç°ËùÓÐPoolµÄ״̬ºÍËùÓÐOSDµÄ״̬¡£

3.CRUSH MAP£º°üº¬µ±Ç°´ÅÅÌ¡¢·þÎñÆ÷¡¢»ú¼ÜµÄ²ã¼¶½á¹¹¡£

4.CRUSH Rules£ºÊý¾ÝÓ³ÉäµÄ²ßÂÔ¡£ÕâЩ²ßÂÔ¿ÉÒÔÁé»îµÄÉèÖÃobject´æ·ÅµÄÇøÓò¡£±ÈÈç¿ÉÒÔÖ¸¶¨ pool1ÖÐËùÓÐobjecst·ÅÖÃÔÚ»ú¼Ü1ÉÏ£¬ËùÓÐobjectsµÄµÚ1¸ö¸±±¾·ÅÖÃÔÚ»ú¼Ü1ÉϵķþÎñÆ÷AÉÏ£¬µÚ2¸ö¸±±¾·Ö²¼ÔÚ»ú¼Ü1ÉϵķþÎñÆ÷BÉÏ¡£ pool2ÖÐËùÓеÄobject·Ö²¼ÔÚ»ú¼Ü2¡¢3¡¢4ÉÏ£¬ËùÓÐObjectµÄµÚ1¸ö¸±±¾·Ö²¼ÔÚ»ú¼Ü2µÄ·þÎñÆ÷ÉÏ£¬µÚ2¸ö¸±±¾·Ö²¼ÔÚ»ú¼Ü3µÄ·þ Æ÷ÉÏ£¬µÚ3¸ö¸±±¾·Ö²¼ÔÚ»ú¼Ü4µÄ·þÎñÆ÷ÉÏ¡£

Client´ÓMonitorsÖеõ½CRUSH MAP¡¢OSD MAP¡¢CRUSH Ruleset£¬È»ºóʹÓÃCRUSHËã·¨¼ÆËã³öObjectËùÔÚµÄOSD set¡£ËùÒÔCeph²»ÐèÒªName·þÎñÆ÷£¬ClientÖ±½ÓºÍOSD½øÐÐͨÐÅ¡£Î±´úÂëÈçÏÂËùʾ£º

 locator = object_name
obj_hash = hash(locator)
pg = obj_hash % num_pg
osds_for_pg = crush(pg) # returns a list of osds
primary = osds_for_pg[0]
replicas = osds_for_pg[1:]

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2.Ôö¼ÓPGµÄÊýÁ¿¿ÉÒÔ¾ùºâÿ¸öOSDµÄ¸ºÔØ£¬Ìá¸ß²¢Ðжȡ£

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3.3 ǿһÖÂÐÔ

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2.ÓÉÓÚÿ¸öObject¶¼Ö»ÓÐÒ»¸öPrimary OSD£¬Òò´Ë¶ÔObjectµÄ¸üж¼ÊÇ˳ÐòµÄ£¬²»´æÔÚͬ²½ÎÊÌâ¡£

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3.4 ÈÝ´íÐÔ

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OSDs¿ÉÒÔ½øÐÐ×Ô¶¯ÐÞ¸´£¬¶øÇÒÊDz¢ÐÐÐÞ¸´¡£

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5.3 ÍÌÍÂÂÊ

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