improved fix for rh write performance

[jedwards4b]

Fixes issue #1042. The original fix in #1043 was not merged - testing showed problems with sathist files. Those problems have been addressed here.

[jedwards@izumi ERC_D_Ln9.f10_f10_mg37.QPC6.izumi_nag.cam-outfrq3s_cospsathist.20240723_111303_e1nxwq]$ cat TestStatus
PASS ERC_D_Ln9.f10_f10_mg37.QPC6.izumi_nag.cam-outfrq3s_cospsathist CREATE_NEWCASE
PASS ERC_D_Ln9.f10_f10_mg37.QPC6.izumi_nag.cam-outfrq3s_cospsathist XML
PASS ERC_D_Ln9.f10_f10_mg37.QPC6.izumi_nag.cam-outfrq3s_cospsathist SETUP
PASS ERC_D_Ln9.f10_f10_mg37.QPC6.izumi_nag.cam-outfrq3s_cospsathist SHAREDLIB_BUILD time=28
PASS ERC_D_Ln9.f10_f10_mg37.QPC6.izumi_nag.cam-outfrq3s_cospsathist MODEL_BUILD time=770
PASS ERC_D_Ln9.f10_f10_mg37.QPC6.izumi_nag.cam-outfrq3s_cospsathist SUBMIT
PASS ERC_D_Ln9.f10_f10_mg37.QPC6.izumi_nag.cam-outfrq3s_cospsathist RUN time=159
PASS ERC_D_Ln9.f10_f10_mg37.QPC6.izumi_nag.cam-outfrq3s_cospsathist COMPARE_base_rest
PASS ERC_D_Ln9.f10_f10_mg37.QPC6.izumi_nag.cam-outfrq3s_cospsathist MEMLEAK insufficient data for memleak test
PASS ERC_D_Ln9.f10_f10_mg37.QPC6.izumi_nag.cam-outfrq3s_cospsathist SHORT_TERM_ARCHIVER

[jedwards4b]

@brian-eaton it's more apparent at high task counts on lustre file systems but there is also a measurable difference on gpfs.