????????
???????????????????????????????? – Windows????У??????????????????????ú???????MBR??GPT??????????????????????Windows???????????????????????????????е?????????·?????????洢???????Raid5??I/O???????????????64KB???offset??λ????????á????????????Linux????fdisk??parted?????????????????????
???????????
?????洢????????????Linux????????????:
??????????????????κε????洢???е?I/O????????????????????????????κ?I/O????????????????????I/O?????????????????????????????????????????????????????????????????????????????????????????ù?fdisk????parted?????????????????
????????????????????????offset?????????EMC???????????????????“64KB”?????????64KB???????????????????????????????????????????????????????????????????????????Raid???????????????????Χ??????????????????????????
????Symmetrix?????е???????λ??С????Track????64??Block??32KB??С?????2?????????????????б????????κ?32KB????????I/O??????????Track?????У?50%??16KB??I/O????????????Track??25%??8KB?????????Track?????????洢???????????

?????1


?????????????????????????????????λ???????Block?????????MBR+Reserved=63Block?????????п?Track??I/O???????????????????????????????????3+1 Raid5???????????С????Track????256??Block??128KB??С??????????????????????64??block????λ?????linux I/O??С??64KB????????I/O??????棨????track?32KB????????????????ζ???????????????????????64KB I/O?????????浽???Raid5??????????д?????????????????64KB??????????????????????????????????????д??????????

?????2


??????????????￡?????????λ??????????????64KB?????????????Linux??I/O??С???????????????????????????????????3??

?????3


??????????????????洢???????????????????I/O??????в?????????????????????????????????????????????????64KB??????????????????á?
????Linux????????????????
??????????????????????????????????????fdisk????????????????????Linux?У??????????????????????????????У?????????????????????????????LUN???????????????????????У??????/dev/emcpowerfw?豸???????????С?51281 Cylinder??Cylinder??Symmetrix???????λ?????Cylinder??С?960KB??????????????С?50GB???????Offset??λ??С?128??block??????豸??????????????????4??????