HP A3550A User Manual - A3661-90001 - Page 65

RAID General Information

1-23

Product Description

Caution

Disk modules having different storage capacities or different model or part numbers

should not be bound into the same RAID group because performance can be

affected.

7KH´QH[W´WKUHH´VXEVHFWLRQV´H[SODLQ´WKUHHÍHDWXUHV´XVHG´LQ´5$,’´WHFKQRORJ\Ã´GLVN´VWULSLQJ»´KDUGZDUH´

PLUURULQJ»´DQG´SDULW\µ´7DEOH´±¸¶´VKRZV´WKH´5$,’´JURXS´XVHGÉ\´HDFKÍHDWXUHµ´

Disk Striping

’LVN´VWULSLQJ´LV´D´WHFKQLTXH´ZKHUHLQ´GDWD´LVÚHDGÍURP´DQG´ZULWWHQ´WR´XQLIRUPO\´VL]HG´VHJPHQWV´

DFURVV´DOO´GLVN´PRGXOHV´LQ´D´5$,’´JURXS´VLPXOWDQHRXVO\´DQG´LQGHSHQGHQWO\µ´7KH´XQLIRUPO\´VL]HG´

VHJPHQWV´DUH´FDOOHGÉORFN´VWULSHVµ´+DUGZDUH´GLVN´VWULSLQJ´FDQÉH´LPSOHPHQWHGÉ\´FRQILJXULQJ´WKH´

GLVN´PRGXOHV´DV´D´5$,’¸±Ç¹´JURXS»´D´5$,’¸¶´JURXS»´RU´D´5$,’¸¿´JURXSµ´%\´DOORZLQJ´PXOWLSOH´VHWV´RI´

UHDGÇZULWH´KHDGV´WR´ZRUN´RQ´WKH´VDPH´,Ç2´RSHUDWLRQ´DW´WKH´VDPH´WLPH»´GLVN´VWULSLQJ´FDQ´HQKDQFH´

SHUIRUPDQFHµ´%ORFN´VWULSLQJ´LQ´5$,’¸±Ç¹»´5$,’¸¶»´DQG´5$,’¸¿´JURXSV´LV´LOOXVWUDWHG´LQ´)LJXUH´±¸±±»´±¸

±²»´DQG´±¸±¶»ÚHVSHFWLYHO\µ

7KH´DPRXQW´RI´LQIRUPDWLRQ´VLPXOWDQHRXVO\ÚHDGÍURP´RU´ZULWWHQ´WR´HDFK´PRGXOH´LV´WKH´VWULSH´

HOHPHQW´VL]Hµ´7KH´GHIDXOW´VWULSH´HOHPHQW´VL]H´LV´±²½´VHFWRUV´RI´¿±²É\WHV´SHU´VHFWRU´Á·¿»¿¶·É\WHVÂ»´

H[FHSWÍRU´5$,’¸¶´JURXSV´ZKRVH´VWULSH´HOHPHQW´VL]H´LVÍL[HG´DW´RQH´VHFWRU´DQG´FDQQRWÉH´PRGLILHGµ´

7KH´VWULSH´HOHPHQW´VL]H´LV´FRQILJXUDEOH´ÁH[FHSWÍRU´5$,’¸¶´JURXSVÂ´DQG´FDQ´DIIHFW´WKH´SHUIRUPDQFH´

RI´5$,’´JURXSVµ

7KH´VPDOOHU´WKH´VWULSH´HOHPHQW´VL]H»´WKH´PRUH´HIILFLHQW´LV´WKH´GLVWULEXWLRQ´RI´GDWDÚHDG´RU´ZULWWHQ´

DFURVV´WKH´VWULSHV´RQ´WKH´GLVNV´LQ´WKH´5$,’´JURXSµ´+RZHYHU»´LI´WKH´VL]H´LV´WRR´VPDOOÍRU´D´VLQJOH´,Ç2´

RSHUDWLRQ»´WKH´RSHUDWLRQÚHTXLUHV´DFFHVV´WR´WZR´VWULSHV»ÚHVXOWLQJ´LQ´DÚHDG´RU´ZULWHÍURP´WZR´GLVN´

PRGXOHV´LQVWHDG´RI´RQHµ´&DOOHG´D´VWULSHÉRXQGDU\´FURVVLQJ»´LW´LPSDFWV´SHUIRUPDQFHµ´7KHÉHVW´VWULSH´

Table 1-3

Disk Striping, Hardware Mirroring, and Parity by RAID Level

RAID level

Disk Striping

Hardware

Mirroring

Parity

RAID-5

Yes

No

Yes

RAID-3

Yes

No

Yes

RAID-1/0

Yes

Yes

No

RAID-1

No

Yes

No

HP A3550A User Manual - A3661-90001 - Page 65

Disk Striping

Page 65 highlights