Issue with 3PAR AO

[Rayasam]

I have a customer facing some issues with AO after OS upgrade last week. The FC tier utilization gradually increased. But he wants SSD utilization to be higher for better performance.

Before OS upgrade the utilization was FC-71%, SSD 68%. Currently FC-86%, SSD-46%. How the OS upgrade cause this issue? How can he increase SSD utilization as it was before?

Date

FC Pool

(%)

SSD Pool

(%)

Pre-OS Upgrade

11-May-2021

71

68

12-May-2021

71

68

13-May-2021

71

68

14-May-2021

71

68

15-May-2021

71

68

Post-OS Upgrade

16-May-2021

75

62

17-May-2021

78

58

18-May-2021

81

53

19-May-2021

83

53

20-May-2021

85

50

21-May-2021

86

46

22-May-2021

86

46

[SUBHAJIT KHANBARMAN_1]

@Rayasam 

I don't think OS upgrade responsible for this behavior but if there was any bug it may be possible. However you can verify AO mode configured with the help of showaocfg command. If you find its configured as Balanced then you can change that to Performance. Your SSD utilization should increase in next AO cycle. 

Hope this helps!
Regards
Subhajit

I am an HPE employee

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[sbhat09]

Hello,

There are no such changes OS upgrade will cause on AO data distribution. The data utilization of data region would have changed over the last week due to which AO has categorized more data as cold data lesser data as hot data.

If the requirement is 'higher utilization of SSD tier', please change the mode to 'performance' from cost/balanced. That will move more data to SSD tier. Observe it for 2-3 days and let me know.

Regards,
Srinivas Bhat

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