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01-12-2014 11:48 PM
01-12-2014 11:48 PM
estimated free system spare
Hi All,
I try select below set size and I have no idea why INC display "4+2" estimated free system spare same as "8+2" and "4+2" more than "6+2" and please review attachment, anyone have idea?
RAID Set Size (Data + Parity) Estimated free system spare (TB) VV size (TB)
10 + 2 1.8 7.9
8 + 2 1.5 7.9
6 + 2 1.1 7.9
4 + 2 1.5 7.9
Best regards,
Chung
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01-13-2014 09:04 PM - edited 01-13-2014 11:43 PM
01-13-2014 09:04 PM - edited 01-13-2014 11:43 PM
Re: estimated free system spare
I created the following CPGs and VVs:
createcpg -t r6 -ssz 6 FC_r6.6
createcpg -t r6 -ssz 8 FC_r6.8
createcpg -t r6 -ssz 10 FC_r6.10
createcpg -t r6 -ssz 12 FC_r6.12
createcpg -t r6 -ssz 16 FC_r6.16
createvv FC_r6.6 r6_6 8G
createvv FC_r6.8 r6_8 8G
createvv FC_r6.10 r6_10 8G
createvv FC_r6.12 r6_12 8G
createvv FC_r6.16 r6_16 8G
showld r6_6*
8832 8192
showld r6_8*
9216 8192
showld r6_10*
9984 8192
showld r6_12*
9984 8192
showld r6_16*
10752 8192
So a setsize of 8 (6+2) takes more space than of 6 (4+2).
This is probably due to my small size of 8G. With 80G, r6_12 is larger than r6_16.