System IPL -- MIDRANGE-L

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Currently my company (bank) is having AS/400 model 530 running v3r6.
Every week my system guy will perform system IPL on Sunday and which
will require to stop  running the machine for about 1- 1.5 hours. My
question is "is it necessary to perform IPL every week ?"  My DASD
utilization is about 60% of 60GB storage and temp. address is about
0.126 and 2Gb of memory.

By the way, if we compare  with IBM mainframe system does anyone know
the processing power of this machine (AS/400 model 530) is close to what
range of mainframe model?

Thanks in advance for any assistance.
Leong Sing Loong
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