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| Array Cache https://3parug.net/viewtopic.php?f=18&t=557 |
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| Author: | 3padm [ Fri Jan 24, 2014 8:26 am ] |
| Post subject: | Array Cache |
Hi, I see that the statcmp displays good cache info but is there a command which is able to flush cache from the nodes memory? I realize this may sound crazy but we are not in prod yet and want to run some IO tests and want to clearcache before each test. Thanks |
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| Author: | Cleanur [ Fri Jan 31, 2014 1:31 pm ] |
| Post subject: | Re: Array Cache |
Sorry not possible, best you can do is to run a 100% random workload, that will attempt to defeat read cache and you could use this as a ramp up test to ensure cache is overwritten prior to you benchmark run. Writes will still be a hit but statcmp only reports write hits for hits in cache e.g when dirty pages (which were destined to be flushed to disk) are overwritten in cache by a subsequent write before they are flushed. |
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