10K FC (we have AO with SSD for heavy volumes)
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| PD Service Time https://3parug.net/viewtopic.php?f=18&t=917 |
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| Author: | oby [ Thu Sep 18, 2014 11:25 am ] |
| Post subject: | PD Service Time |
Hi, what's you typical service time for write/read on the physical disks? toby |
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| Author: | nsnidanko [ Thu Sep 18, 2014 11:51 am ] |
| Post subject: | Re: PD Service Time |
10K FC (we have AO with SSD for heavy volumes)
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| Author: | oby [ Fri Sep 19, 2014 7:55 am ] |
| Post subject: | Re: PD Service Time |
okay, my write servicetimes are way to high (20ms). I think I'll change from Raid5 to Raid1 and AO is enabled. |
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| Author: | oby [ Mon Sep 22, 2014 10:07 am ] | ||
| Post subject: | Re: PD Service Time | ||
Hi, okay my Ports Performance Statistics. Is it average, good or bad? Anyone a opinion?
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| Author: | Cleanur [ Tue Sep 23, 2014 4:01 am ] |
| Post subject: | Re: PD Service Time |
Which ports, front end, back end or both ? |
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| Author: | oby [ Tue Sep 23, 2014 6:49 am ] |
| Post subject: | Re: PD Service Time |
The chart is from the front end ports. |
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| Author: | nsnidanko [ Tue Sep 23, 2014 9:23 am ] |
| Post subject: | Re: PD Service Time |
It does look quite busy but you need to look at your workload. For some applications anything below 20ms is acceptable while for other applications anything above 5ms will be an issue. We were pushing our system to its max and were seeing similar response time with 10K FC drives (3par is great technology to deliver this workload without any hiccups). If you have 3.1.3 I highly suggest you run region density reports and find out how much data is causing how much IO. We discovered we had X TBs of data responsible for 80% of our IO. So we invested into SSD+AO and our front end response time dropped to sub 3ms In 3.1.3 you can run density reports for individual VV and see how much "hot" data you have per each volume. If you don't have AO licenses wait for Flash cache to come out and it might do that trick for you by simply putting some SSDs (Note: Flash Cache is only for reads). Raid 5 to Raid 1 will give you very slim performance gains as I believe 3par's Raid 5 is 80% performance of raid 1. |
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| Author: | oby [ Tue Sep 23, 2014 9:26 am ] |
| Post subject: | Re: PD Service Time |
Hi, we have AO and our AO Policy is set to Performance. |
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| Author: | nsnidanko [ Tue Sep 23, 2014 9:28 am ] |
| Post subject: | Re: PD Service Time |
oby wrote: Hi, we have AO and our AO Policy is set to Performance. what are your tiers? Raid 5 10K to Raid 1 10K? |
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| Author: | oby [ Tue Sep 23, 2014 9:42 am ] |
| Post subject: | Re: PD Service Time |
My tiers are SSD R5 3+1 -> FC 15k R5 3+1 -> NL 7K R6 6+2. Perhaps the high service time comes from the NL disks. |
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