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| StatPD and idle Disks https://3parug.com/viewtopic.php?f=18&t=2931 |
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| Author: | ca6gel [ Sun Jul 15, 2018 11:14 pm ] | ||
| Post subject: | StatPD and idle Disks | ||
Hey Guys, just playing with a few performance commands having a look see if anything interesting or odd showed up and low and behold it did.. a whole heap of SSD disks idle on one of the 2 ports (not all them mind), maybe nothing but I found it strange.. none of our other disks have this occurrence.. any thoughts or suggestions appreciated (no adaptive flash cache setup)
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| Author: | MammaGutt [ Mon Jul 16, 2018 10:28 am ] |
| Post subject: | Re: StatPD and idle Disks |
If Express Layout isn't triggered, all traffic to that disk will come from one node. What is your hardware config and CPG settings. |
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| Author: | ca6gel [ Mon Jul 16, 2018 5:03 pm ] |
| Post subject: | Re: StatPD and idle Disks |
MammaGutt wrote: If Express Layout isn't triggered, all traffic to that disk will come from one node. What is your hardware config and CPG settings. So hardware wise we have 3 shelves, 1 NL, 1 Half Full with SSD and 1 50/50 SSD and FC disk. we have 6 CPG's, 1 for each disk type for direct presented LUN's and 1 for each disk type for AO, which is how most of our disks are presented. SSD Settings: Direct Settings: Device type SSD 150K Raid type RAID 5 Availability Requested Magazine (Lower) Current Magazine (Lower) Set size 5 data, 1 parity Step size 64 KiB Preferred chunklets Fast Disk filter -t r5 -ha mag -ssz 6 -p -devtype SSD -rpm 150 AO Settings: Device type SSD 150K Raid type RAID 5 Availability Requested Magazine (Lower) Current Magazine (Lower) Set size 3 data, 1 parity Step size 64 KiB Preferred chunklets Fast Disk filter -t r5 -ha mag -ssz 4 -p -devtype SSD -rpm 150 |
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| Author: | MammaGutt [ Tue Jul 17, 2018 12:45 am ] |
| Post subject: | Re: StatPD and idle Disks |
So you have 24 SSDs and 2 nodes? |
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| Author: | ca6gel [ Wed Jul 18, 2018 6:25 pm ] |
| Post subject: | Re: StatPD and idle Disks |
MammaGutt wrote: So you have 24 SSDs and 2 nodes? 20 SSD's over 2 nodes |
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| Author: | MammaGutt [ Thu Jul 19, 2018 2:36 am ] |
| Post subject: | Re: StatPD and idle Disks |
Then that would give 10 SSDs per node (assuming correct physical placement and identical capacity) and that shouldn't trigger Express Layout for your config. I would trigger a tunesys to see if that would even it out and fix the problem. |
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