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estimated free system spare

 
chinchillaking
Occasional Contributor

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

1 REPLY

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.