1. ½éÉÜ
ÔÆÓ²ÅÌÊÇIaaSÔÆÆ½Ì¨µÄÖØÒª×é³É²¿·Ö£¬ÔÆÓ²Å̸øÐéÄâ»úÌṩÁË³Ö¾ÃµÄ¿é´æ´¢É豸¡£Ä¿Ç°µÄAWS
µÄEBS(Elastic Block store)¸øAmazonµÄEC2ʵÀýÌṩÁ˸߿ÉÓø߿ɿ¿µÄ¿é¼¶´æ´¢¾í£¬EBSÊʺÏÓÚһЩÐèÒª·ÃÎÊ¿éÉ豸µÄÓ¦Ó㬱ÈÈçÊý¾Ý¿â¡¢ÎļþϵͳµÈ¡£
ÔÚOpenStackÖУ¬¿ÉÒÔʹÓÃCeph¡¢Sheepdog¡¢GlusterFS×÷ÎªÔÆÓ²Å̵ĿªÔ´½â¾ö·½°¸£¬ÏÂÃæÎÒÃÇÀ´Á˽âCephµÄ¼Ü¹¹¡£
CephÊÇͳһ´æ´¢ÏµÍ³£¬Ö§³ÖÈýÖÖ½Ó¿Ú¡£
1.Object£ºÓÐÔÉúµÄAPI£¬¶øÇÒÒ²¼æÈÝSwiftºÍS3µÄAPI
2.Block£ºÖ§³Ö¾«¼òÅäÖᢿìÕÕ¡¢¿Ë¡
3.File£ºPosix½Ó¿Ú£¬Ö§³Ö¿ìÕÕ
CephÒ²ÊÇ·Ö²¼Ê½´æ´¢ÏµÍ³£¬ËüµÄÌØµãÊÇ£º
¸ßÀ©Õ¹ÐÔ£ºÊ¹ÓÃÆÕͨx86·þÎñÆ÷£¬Ö§³Ö10~1000̨·þÎñÆ÷£¬Ö§³ÖTBµ½PB¼¶µÄÀ©Õ¹¡£
¸ß¿É¿¿ÐÔ£ºÃ»Óе¥µã¹ÊÕÏ£¬¶àÊý¾Ý¸±±¾£¬×Ô¶¯¹ÜÀí£¬×Ô¶¯ÐÞ¸´¡£
¸ßÐÔÄÜ£ºÊý¾Ý·Ö²¼¾ùºâ£¬²¢Ðл¯¶È¸ß¡£¶ÔÓÚobjects storageºÍblock
storage,²»ÐèÒªÔªÊý¾Ý·þÎñÆ÷¡£

2. ±³¾°
ĿǰInktank¹«Ë¾ÕÆ¿ØCephµÄ¿ª·¢£¬µ«CephÊÇ¿ªÔ´µÄ£¬×ñÑLGPLÐÒé¡£Inktank»¹»ý¼«ÕûºÏCephºÍÆäËûÔÆ¼ÆËãºÍ´óÊý¾Ýƽ̨£¬Ä¿Ç°CephÖ§³ÖOpenStack¡¢CloudStack¡¢OpenNebula¡¢HadoopµÈ¡£
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) ¡£
ĿǰCephÓкܶàÓû§°¸ÁУ¬ÕâÊÇ2013.03ÔÂInktank¹«Ë¾ÔÚÓʼþÁбíÖÐ×öµÄµ÷²é£¬¹²ÊÕµ½ÁË81·ÝÓÐЧ·´À¡[2]¡£´Óµ÷²éÖпÉÒÔ¿´µ½ÓÐ26%µÄÓû§ÔÚÉú²ú»·¾³ÖÐʹÓÃCeph£¬ÓÐ37%µÄÓû§ÔÚ˽ÓÐÔÆÖÐʹÓÃCeph£¬»¹ÓÐÓÐ16%µÄÓû§ÔÚ¹«ÓÐÔÆÖÐʹÓÃCeph¡£

ĿǰCeph×î´óµÄÓû§°¸ÀýÊÇDreamhostµÄObject Service£¬Ä¿Ç°×ÜÈÝÁ¿ÊÇ3PB£¬¿É¿¿ÐÔ´ïµ½99.99999%£¬Êý¾Ý´æ·Å²ÉÓÃÈý¸±±¾£¬ËüµÄ¼Û¸ñ±ÈS3»¹±ãÒË¡£ÏÂͼÖУ¬×ó±ßÊÇInktankµÄºÏ×÷»ï°é£¬ÓÒ±ßÊÇInktankµÄÓû§¡£

3. ¼Ü¹¹
3.1 ×é¼þ

CephµÄµ×²ãÊÇRADOS£¬ËüµÄÒâ˼ÊÇ¡°A reliable, autonomous,
distributed object storage¡±¡£ RADOSÓÉÁ½¸ö×é¼þ×é³É£º
1.OSD£º Object Storage Device£¬Ìṩ´æ´¢×ÊÔ´¡£
2.Monitor£ºÎ¬»¤Õû¸öCeph¼¯ÈºµÄÈ«¾Ö״̬¡£
RADOS¾ßÓкÜÇ¿µÄÀ©Õ¹ÐԺͿɱà³ÌÐÔ£¬Ceph»ùÓÚRADOS¿ª·¢ÁË
Object Storage¡¢Block Storage¡¢FileSystem¡£CephÁíÍâÁ½¸ö×é¼þÊÇ£º
1.MDS£ºÓÃÓÚ±£´æCephFSµÄÔªÊý¾Ý¡£
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
ÔÚCephÖУ¬ObjectÏÈÓ³Éäµ½PG(Placement Group)£¬ÔÙÓÉPGÓ³Éäµ½OSD
set¡£Ã¿¸öPoolÓжà¸öPG£¬Ã¿¸öObjectͨ¹ý¼ÆËãhashÖµ²¢È¡Ä£µÃµ½ËüËù¶ÔÓ¦µÄPG¡£PGÔÙÓ³Éäµ½Ò»×éOSD£¨OSDµÄ¸öÊýÓÉPool
µÄ¸±±¾Êý¾ö¶¨£©£¬µÚÒ»¸öOSDÊÇPrimary£¬Ê£ÏµĶ¼ÊÇReplicas¡£
Êý¾ÝÓ³Éä(Data Placement)µÄ·½Ê½¾ö¶¨Á˴洢ϵͳµÄÐÔÄܺÍÀ©Õ¹ÐÔ¡£(Pool,
PG) ¡ú OSD set µÄÓ³ÉäÓÉËĸöÒòËØ¾ö¶¨£º
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:] |
ÕâÖÖÊý¾ÝÓ³ÉäµÄÓŵãÊÇ£º
1.°ÑObject·Ö³É×飬Õâ½µµÍÁËÐèҪ׷×ٺʹ¦ÀímetadataµÄÊýÁ¿(ÔÚÈ«¾ÖµÄ²ãÃæÉÏ£¬ÎÒÃDz»ÐèҪ׷×ٺʹ¦Àíÿ¸öobjectµÄmetadataºÍplacement£¬Ö»ÐèÒª¹ÜÀíPGµÄmetadata¾Í¿ÉÒÔÁË¡£PGµÄÊýÁ¿¼¶Ô¶Ô¶µÍÓÚobjectµÄÊýÁ¿¼¶)¡£
2.Ôö¼ÓPGµÄÊýÁ¿¿ÉÒÔ¾ùºâÿ¸öOSDµÄ¸ºÔØ£¬Ìá¸ß²¢Ðжȡ£
3.·Ö¸ô¹ÊÕÏÓò£¬Ìá¸ßÊý¾ÝµÄ¿É¿¿ÐÔ¡£
3.3 ǿһÖÂÐÔ
1.CephµÄ¶Áд²Ù×÷²ÉÓÃPrimary-ReplicaÄ£ÐÍ£¬ClientÖ»ÏòObjectËù¶ÔÓ¦OSD
setµÄPrimary·¢Æð¶ÁдÇëÇó£¬Õâ±£Ö¤ÁËÊý¾ÝµÄǿһÖÂÐÔ¡£
2.ÓÉÓÚÿ¸öObject¶¼Ö»ÓÐÒ»¸öPrimary OSD£¬Òò´Ë¶ÔObjectµÄ¸üж¼ÊÇ˳ÐòµÄ£¬²»´æÔÚͬ²½ÎÊÌâ¡£
3.µ±PrimaryÊÕµ½ObjectµÄдÇëÇóʱ£¬Ëü¸ºÔð°ÑÊý¾Ý·¢Ë͸øÆäËûReplicas£¬Ö»ÒªÕâ¸öÊý¾Ý±»±£´æÔÚËùÓеÄOSDÉÏʱ£¬Primary²ÅÓ¦´ðObjectµÄдÇëÇó£¬Õâ±£Ö¤Á˸±±¾µÄÒ»ÖÂÐÔ¡£

3.4 ÈÝ´íÐÔ
ÔÚ·Ö²¼Ê½ÏµÍ³ÖУ¬³£¼ûµÄ¹ÊÕÏÓÐÍøÂçÖжϡ¢µôµç¡¢·þÎñÆ÷å´»ú¡¢Ó²Å̹ÊÕϵȣ¬CephÄܹ»ÈÝÈÌÕâЩ¹ÊÕÏ£¬²¢½øÐÐ×Ô¶¯ÐÞ¸´£¬±£Ö¤Êý¾ÝµÄ¿É¿¿ÐÔºÍϵͳ¿ÉÓÃÐÔ¡£
MonitorsÊÇCeph¹Ü¼Ò£¬Î¬»¤×ÅCephµÄÈ«¾Ö״̬¡£MonitorsµÄ¹¦ÄܺÍzookeeperÀàËÆ£¬ËüÃÇʹÓÃQuorumºÍPaxosË㷨ȥ½¨Á¢È«¾Ö״̬µÄ¹²Ê¶¡£
OSDs¿ÉÒÔ½øÐÐ×Ô¶¯ÐÞ¸´£¬¶øÇÒÊDz¢ÐÐÐÞ¸´¡£
¹ÊÕϼì²â£º
OSDÖ®¼äÓÐÐÄÌø¼ì²â£¬µ±OSD A¼ì²âµ½OSD BûÓлØÓ¦Ê±£¬»á±¨¸æ¸øMonitors˵OSD
BÎÞ·¨Á¬½Ó£¬ÔòMonitors¸øOSD B±ê¼ÇΪdown״̬£¬²¢¸üÐÂOSD Map¡£µ±¹ýÁËMÃëÖ®ºó»¹ÊÇÎÞ·¨Á¬½Óµ½OSD
B£¬ÔòMonitors¸øOSD B±ê¼ÇΪout״̬(±íÃ÷OSD B²»Äܹ¤×÷£©£¬²¢¸üÐÂOSD Map¡£
±¸×¢£º¿ÉÒÔÔÚCephÖÐÅäÖÃMµÄÖµ¡£
¹ÊÕϻָ´£º
µ±Ä³¸öPG¶ÔÓ¦µÄOSD setÖÐÓÐÒ»¸öOSD±»±ê¼ÇΪdownʱ(¼ÙÈçÊÇPrimary±»±ê¼ÇΪdown£¬Ôòij¸öReplica»á³ÉΪеÄPrimary£¬²¢´¦ÀíËùÓжÁд
objectÇëÇó)£¬Ôò¸ÃPG´¦ÓÚactive+degraded״̬£¬Ò²¾ÍÊǵ±Ç°PGÓÐЧµÄ¸±±¾ÊýÊÇN-1¡£
¹ýÁËMÃëÖ®ºó£¬¼ÙÈ绹ÊÇÎÞ·¨Á¬½Ó¸ÃOSD£¬ÔòËü±»±ê¼ÇΪout£¬Ceph»áÖØÐ¼ÆËãPGµ½OSD
setµÄÓ³Éä(µ±ÓÐеÄOSD¼ÓÈëµ½¼¯ÈºÊ±£¬Ò²»áÖØÐ¼ÆËãËùÓÐPGµ½OSD setµÄÓ³Éä)£¬ÒԴ˱£Ö¤PGµÄÓÐЧ¸±±¾ÊýÊÇN¡£
ÐÂOSD setµÄPrimaryÏȴӾɵÄOSD setÖÐÊÕ¼¯PG log£¬µÃµ½Ò»·ÝAuthoritative
History(ÍêÕûµÄ¡¢È«ÐòµÄ²Ù×÷ÐòÁÐ)£¬²¢ÈÃÆäËûReplicasͬÒâÕâ·ÝAuthoritative History(Ò²¾ÍÊÇÆäËûReplicas¶ÔPGµÄËùÓÐobjectsµÄ״̬´ï³ÉÒ»ÖÂ)£¬Õâ¸ö¹ý³Ì½Ð×öPeering¡£
µ±Peering¹ý³ÌÍê³ÉÖ®ºó£¬PG½ø Èëactive+recoverying״̬£¬Primary»áÇ¨ÒÆºÍͬ²½ÄÇЩ½µ¼¶µÄobjectsµ½ËùÓеÄreplicasÉÏ£¬±£Ö¤ÕâЩobjects
µÄ¸±±¾ÊýΪN¡£
4. Óŵã
4.1 ¸ßÐÔÄÜ
ClientºÍServerÖ±½ÓͨÐÅ£¬²»ÐèÒª´úÀíºÍת·¢
¶à¸öOSD´øÀ´µÄ¸ß²¢·¢¶È¡£objectsÊÇ·Ö²¼ÔÚËùÓÐOSDÉÏ¡£
¸ºÔؾùºâ¡£Ã¿¸öOSD¶¼ÓÐÈ¨ÖØÖµ(ÏÖÔÚÒÔÈÝÁ¿ÎªÈ¨ÖØ)¡£
client²»ÐèÒª¸ºÔ𸱱¾µÄ¸´ÖÆ(ÓÉprimary¸ºÔð),Õâ½µµÍÁËclientµÄÍøÂçÏûºÄ¡£

4.2 ¸ß¿É¿¿ÐÔ
Êý¾Ý¶à¸±±¾¡£¿ÉÅäÖõÄper-pool¸±±¾²ßÂԺ͹ÊÕÏÓò²¼¾Ö£¬Ö§³ÖǿһÖÂÐÔ¡£
ûÓе¥µã¹ÊÕÏ¡£¿ÉÒÔÈÌÊÜÐí¶àÖÖ¹ÊÕϳ¡¾°£»·ÀÖ¹ÄÔÁÑ£»µ¥¸ö×é¼þ¿ÉÒÔ¹ö¶¯Éý¼¶²¢ÔÚÏßÌæ»»¡£
ËùÓйÊÕϵļì²âºÍ×Ô¶¯»Ö¸´¡£»Ö¸´²»ÐèÒªÈ˹¤½éÈ룬ÔÚ»Ö¸´ÆÚ¼ä£¬¿ÉÒÔ±£³ÖÕý³£µÄÊý¾Ý·ÃÎÊ¡£
²¢Ðлָ´¡£²¢ÐеĻָ´»úÖÆ¼«´óµÄ½µµÍÁËÊý¾Ý»Ö¸´Ê±¼ä£¬Ìá¸ßÊý¾ÝµÄ¿É¿¿ÐÔ¡£


4.2 ¸ßÀ©Õ¹ÐÔ
¸ß¶È²¢ÐС£Ã»Óе¥¸öÖÐÐÄ¿ØÖÆ×é¼þ¡£ËùÓиºÔض¼Äܶ¯Ì¬µÄ»®·Öµ½¸÷¸ö·þÎñÆ÷ÉÏ¡£°Ñ¸ü¶àµÄ¹¦Äܷŵ½OSDÉÏ£¬ÈÃOSD¸üÖÇÄÜ¡£
×Ô¹ÜÀí¡£ÈÝÒ×À©Õ¹¡¢Éý¼¶¡¢Ìæ»»¡£µ±×é¼þ·¢Éú¹ÊÕÏʱ£¬×Ô¶¯½øÐÐÊý¾ÝµÄÖØÐ¸´ÖÆ¡£µ±×é¼þ·¢Éú±ä»¯Ê±(Ìí¼Ó/ɾ³ý)£¬×Ô¶¯½øÐÐÊý¾ÝµÄÖØ·Ö²¼¡£

5. ²âÊÔ
ʹÓÃfio²âÊÔRBDµÄIOPS£¬Ê¹ÓÃdd²âÊÔRBDµÄÍÌÍÂÂÊ£¬ÏÂÃæÊDzâÊԵIJÎÊý£º
1.fioµÄ²ÎÊý£ºbs=4K, ioengine=libaio, iodepth=32,
numjobs=16, direct=1
2.ddµÄ²ÎÊý£ºbs=512M,oflag=direct
ÎÒÃǵIJâÊÔ·þÎñÆ÷ÊÇAWSÉÏ×îÇ¿µÄʵÀý£º
1.117GBÄÚ´æ
2.˫· E5-2650,¹²16ºË
3.24 * 2TB Ó²ÅÌ
·þÎñÆ÷ÉϵIJÙ×÷ϵͳÊÇUbuntu 13.04£¬°²×°Ceph Cuttlefish
0.61°æ£¬¸±±¾ÊýÉèÖÃΪ2£¬RBDÖеĿé´óСÉèÖÃΪ1M¡£ÎªÁ˶Աȣ¬Í¬Ê±»¹¶ÔÈí¼þRAID10½øÐÐÁ˲âÊÔ¡£ÏÂÃæ±í¸ñÖеÄÐÔÄܱÈÊÇCephÓëRAID10ÐÔÄÜÖ®¼äµÄ±È½Ï¡£
5.1 ×¢Òâ
ÒòΪʹÓõÄÊÇAWSÉϵÄÐéÄâ»ú£¬ËùÒÔËü(Xen)¹ÒÔØµÄ´ÅÅ̶¼ÊÇÉèÖÃÁËCacheµÄ¡£Òò´ËÏÂÃæ²âÊÔµÄÊý¾Ý²¢²»ÄÜÕæÊµ·´Ó¦ÎïÀí´ÅÅ̵ÄÕæÊµÐÔÄÜ£¬½ö¹©ÓëRAID10½øÐжԱȡ£
5.2 IOPS

5.3 ÍÌÍÂÂÊ

5.4 ½á¹û·ÖÎö
´Ó²âÊÔ½á¹ûÖУ¬ÎÒÃÇ¿´µ½ÔÚµ¥»úÇé¿öÏ£¬RBDµÄÐÔÄܲ»ÈçRAID10£¬ÕâÊÇΪʲô£¿ÎÒÃÇ¿ÉÒÔͨ¹ýÈýÖÖ·½·¨ÕÒµ½ÔÒò£º
1.ÔĶÁCephÔ´Â룬²é¿´I/O·¾¶
2.ʹÓÃblktrace²é¿´I/O²Ù×÷µÄÖ´ÐÐ
3.ʹÓÃiostat¹Û²ìÓ²Å̵ĶÁдÇé¿ö
RBDµÄI/O·¾¶ºÜ³¤£¬Òª¾¹ýÍøÂç¡¢Îļþϵͳ¡¢´ÅÅÌ£º
Librbd -> networking -> OSD -> FileSystem -> Disk |
ClientµÄÿ¸öд²Ù×÷ÔÚOSDÖÐÒª¾¹ý8ÖÖỊ̈߳¬Ð´²Ù×÷Ï·¢µ½OSDÖ®ºó£¬»á²úÉú2~3¸ö´ÅÅÌseek²Ù×÷£º
°Ñд²Ù×÷¼Ç¼µ½OSDµÄJournalÎļþÉÏ(JournalÊÇΪÁ˱£Ö¤Ð´²Ù×÷µÄÔ×ÓÐÔ)¡£
°Ñд²Ù×÷¸üе½Object¶ÔÓ¦µÄÎļþÉÏ¡£
°Ñд²Ù×÷¼Ç¼µ½PG LogÎļþÉÏ¡£
ÎÒʹÓÃfioÏòRBD²»¶ÏдÈëÊý¾Ý£¬È»ºóʹÓÃiostat¹Û²ì´ÅÅ̵ĶÁдÇé¿ö¡£ÔÚ1·ÖÖÓÖ®ÄÚ£¬fioÏòRBDдÈëÁË3667
MBµÄÊý¾Ý£¬24¿éÓ²ÅÌÔò±»Ð´ÈëÁË16084 MBµÄÊý¾Ý£¬±»¶ÁÈ¡ÁË288 MBµÄÊý¾Ý¡£
ÏòRBDдÈë1MBÊý¾Ý = ÏòÓ²ÅÌдÈë4.39MBÊý¾Ý + ¶ÁÈ¡0.08MBÊý¾Ý
6. ½áÂÛ
ÔÚµ¥»úÇé¿öÏ£¬RBDµÄÐÔÄܲ»È紫ͳµÄRAID10£¬ÕâÊÇÒòΪRBDµÄI/O·¾¶ºÜ¸´ÔÓ£¬µ¼ÖÂЧÂʺܵ͡£µ«ÊÇCephµÄÓÅÊÆÔÚÓÚËüµÄÀ©Õ¹ÐÔ£¬ËüµÄÐÔÄÜ»áËæ×Å´ÅÅÌÊýÁ¿ÏßÐÔÔö³¤£¬Òò´ËÔÚ¶à»úµÄÇé¿öÏ£¬RBDµÄIOPSºÍÍÌÍÂÂÊ»á¸ßÓÚµ¥»úµÄRAID10(²»¹ýÐÔÄÜ»áÊÜÏÞÓÚÍøÂçµÄ´ø¿í)¡£
ÈçǰËùÊö£¬CephÓÅÊÆÏÔÖø£¬Ê¹ÓÃËüÄܹ»½µµÍÓ²¼þ³É±¾ºÍÔËά³É±¾£¬µ«ËüµÄ¸´ÔÓÐÔ»á´øÀ´Ò»¶¨µÄѧϰ³É±¾¡£
|