HP A3550A User Manual - A3661-90001 - Page 157
Logical Unit Number LUN, Maximum Rebuild Time, Sectors per Stripe Element, Enable Caches LUN Cache
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Grid Manager Logical Unit Number (LUN) Note The operating system recognizes LUNs 0 through 7 only. Maximum Rebuild Time Sectors per Stripe Element Enable Caches (LUN Cache) Creating Logical Disk Units (LUNs) 4-21
![](/manual_guide/products/hewlettpackard-a3550a-user-manual-a366190001-8d3aca2/157.png)
Creating Logical Disk Units (LUNs)
4-21
Grid Manager
Logical Unit Number (LUN)
7KH´GHIDXOW´ORJLFDO´XQLW´QXPEHU´Á/81´LV´WKH´QH[W´KH[DGHFLPDO´QXPEHU´DYDLODEOH»´VWDUWLQJ´ZLWK´
¹µ´7KH´ILUVW´/81´ERXQG»´UHJDUGOHVV´RI´WKH´QXPEHU´RI´63V´RU´KRVWV´DWWDFKHG´WR´WKLV´GLVN´DUUD\»´KDV´
WKH´GHIDXOW´QXPEHU´¹»´WKH´VHFRQG´±»´WKH´WKLUG´²»´DQG´VR´RQµ´,W´LV´SRVVLEOH´WR´VSHFLI\´D´QRQ¸GHIDXOW´
QXPEHU´ÁKH[DGHFLPDOµ´)RU´WKH´QH[W´/81´ERXQG»´WKH´GHIDXOW´QXPEHU´LV´WKH´ORZHVW´QXPEHU´QRW´LQ´
XVHµ
:KHQ´ELQGLQJ´D´JOREDO´KRW´VSDUH»´WKH´/81´QXPEHU´DVVLJQHG´LV´XVHG´RQO\´ZKLOH´WKH´JOREDO´KRW´
VSDUH´LV´RQ´VWDQGE\µ´:KHQ´WKH´JOREDO´KRW´VSDUH´LV´LQWHJUDWHG´LQWR´D´GLVN´JURXS»´LW´WDNHV´WKDW´
JURXSÀV´/81´QXPEHUµ´:KHQ´LW´UHWXUQV´WR´JOREDO´KRW´VSDUH´VWDWXV»´LW´UHJDLQV´LWV´RULJLQDO´/81´
QXPEHUµ
2QO\´/81V´QXPEHUHG´¹´WKURXJK´¼´VKRXOG´EH´ERXQG´EHFDXVH´6&6,¸²´VSHFLILHV´RQO\´WKUHH´ELWV´IRU´
WKH´/81´ILHOGµ´7KLV´OLPLWV´WKH´QXPEHU´RI´/81V´WR´HLJKW´ZLWK´YDOLG´YDOXHV´RI´¹´WKURXJK´¼µ
Note
The operating system recognizes LUNs 0 through 7 only.
Maximum Rebuild Time
7KH´PD[LPXP´UHEXLOG´WLPH´VSHFLILHV´WKH´PD[LPXP´QXPEHU´RI´KRXUV´WKH´GLVN´DUUD\´FDQ´WDNH´WR´
LQWHJUDWH´D´JOREDO´KRW´VSDUH´RU´QHZ´GLVN´PRGXOH´ÁLQVHUWHG´WR´UHSODFH´D´GHIHFWLYH´RQH´LQWR´WKH´
JURXSµ´7KH´IRXU¸KRXU´GHIDXOW´YDOXH´LV´UHFRPPHQGHGµ´6HOHFWLQJ´ORZHU´UHEXLOG´WLPHV´LPSDFWV´
V\VWHP´SHUIRUPDQFHµ´7KH´UHEXLOG´WLPH´FDQ´EH´FKDQJHG´ZLWK´*ULG´0DQDJHU´ODWHU´ZLWKRXW´
GDPDJLQJ´WKH´LQIRUPDWLRQ´VWRUHG´RQ´WKH´/81µ´+RZHYHU»´FKDQJLQJ´WKH´UHEXLOG´WLPH´GXULQJ´D´
UHEXLOG´GRHV´QRW´VSHHG´XS´WKH´UHEXLOG´DQG´GRHV´QRW´WDNH´DIIHFW´XQWLO´WKH´FXUUHQW´UHEXLOG´KDV´
FRPSOHWHGµ
Sectors per Stripe Element
7KH´QXPEHU´RI´VHFWRUV´SHU´VWULSH´HOHPHQW´VSHFLILHV´WKH´VWULSH´VL]H´LQ´¿±²¸E\WH´GLVN´VHFWRUV´RQ´
HDFK´GLVN´LQ´WKH´5$,’´JURXSµ´7KH´VWULSH´HOHPHQW´VL]H´VSHFLILHG´KHUH´EHFRPHV´DQ´LQWHJUDO´SDUW´RI´
WKH´/81µ´,W´FDQQRW´EH´FKDQJHG´ZLWKRXW´XQELQGLQJ´WKH´/81»´ZKLFK´GHVWUR\V´DOO´GDWD´RQ´LWµ
Enable Caches (LUN Cache)
/81´FDFKLQJ´ZRUNV´RQO\´LI´GLVN´DUUD\´FDFKLQJ´LV´HQDEOHGµ
7KUHH´RSWLRQV´DUH´DYDLODEOH´IRU´/81´FDFKLQJÃ