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95 Posts

08-08-2017

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Preserved cache - M5210

2018-02-02, 11:56 AM

Hello,

quick question - may Preserved Cache function have any impact on write speed if turned off, or is it only mentioned for disk loss situation?

thanks 

Regards Leos
Thanks to Mark as Solution or granting Kudos if you find my answer helpful
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17 Posts

04-23-2015

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Re: Preserved cache - M5210

2018-02-09, 3:57 AM

According to the document listed below, "Preserved Cache" Property;
"Indicates whether the controller cache is preserved because of missing or offline virtual drives; the cache is preserved until the virtual drive is imported or the cache is discarded." 

 

ServeRAID-M Software User Guide

ftp://ftp.software.ibm.com/systems/support/system_x_pdf/ibm_serveraid_m_software_user_guide_11th_edition.pdf

 

So, "Preserved Cache" = <No> simply means there is no cache data preserved at this time. 

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Re: Preserved cache - M5210

2018-02-05, 9:55 AM

Not sure what you mean by turning off preserve cache function, but if you mean just removing BBU (Battery Backup Unit) while retaining cache function, as long as cache write policy ("Write Back" or "Write Through" ) stays the same, there will be no difference in performance.  If you mean disabling cache function, it would impact performance, unless pretty fast storage devices like SSD are used.

 

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95 Posts

08-08-2017

Czech Republic

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Re: Preserved cache - M5210

2018-02-08, 13:15 PM

Hello,

what I mean is this option

what does it exactly do and why I cant change anything here?

thx

Regards Leos
Thanks to Mark as Solution or granting Kudos if you find my answer helpful
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87 Posts

08-13-2015

China

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Re: Preserved cache - M5210

2018-02-08, 14:57 PM

it is the controller cache parameter setting,  all is default setting by controller fw definition. 

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95 Posts

08-08-2017

Czech Republic

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Re: Preserved cache - M5210

2018-02-08, 14:59 PM

OK so at this screen, why is Preserved cache - NO? what does it mean then. I have M5210 with 1GB flash cache RAID5 upgrade.

thx

Regards Leos
Thanks to Mark as Solution or granting Kudos if you find my answer helpful
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17 Posts

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Japan

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  • Message 6 of 7

Re: Preserved cache - M5210

2018-02-09, 3:57 AM

According to the document listed below, "Preserved Cache" Property;
"Indicates whether the controller cache is preserved because of missing or offline virtual drives; the cache is preserved until the virtual drive is imported or the cache is discarded." 

 

ServeRAID-M Software User Guide

ftp://ftp.software.ibm.com/systems/support/system_x_pdf/ibm_serveraid_m_software_user_guide_11th_edition.pdf

 

So, "Preserved Cache" = <No> simply means there is no cache data preserved at this time. 

0 person found this solution to be helpful.

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95 Posts

08-08-2017

Czech Republic

94 Signins

971 Page Views

  • Posts: 95
  • Registered: ‎08-08-2017
  • Location: Czech Republic
  • Views: 971
  • Message 7 of 7

Re: Preserved cache - M5210

2018-02-12, 13:20 PM

Thanks for the document link, I could not find it for ages.... Is there also newer version available as the UEFI interface looks totally different now, or are the settings in current M5210 controllers completely the same?

 

 

Regards Leos
Thanks to Mark as Solution or granting Kudos if you find my answer helpful
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