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тАО03-14-2013 07:18 PM
тАО03-14-2013 07:18 PM
Re: Importance of path change settings in VMware
I would be interested in seeing the results of the tests. When I tried using low IOPS per path numbers I saw small block random performance degrade. I did not try setting IOPS per path to 0. I didn't even know that would be a valid input!
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тАО04-10-2013 09:21 AM
тАО04-10-2013 09:21 AM
Re: Importance of path change settings in VMware
These settings apply/benefit 10Gb?
Thanks
-Craig
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тАО04-10-2013 10:04 AM
тАО04-10-2013 10:04 AM
Re: Importance of path change settings in VMware
Yes, definitely. Assuming you have dual 10G bind to the iSCSI initiatior, PSP_RR will leverage both paths without having to wait for a given path to reach X IOPS or X bytes before the switch.
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тАО04-18-2013 10:06 AM
тАО04-18-2013 10:06 AM
Re: Importance of path change settings in VMware
Is this (or iops=0/bytes=0) going to end up in the Nimble VMware installation guide?
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тАО04-18-2013 10:55 AM
тАО04-18-2013 10:55 AM
Re: Importance of path change settings in VMware
it is making its way to the next edition of the vsphere on Nimble best practices guide - the same will go into the next edition of the vmware integration guide as well.
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тАО04-18-2013 03:09 PM
тАО04-18-2013 03:09 PM
Re: Importance of path change settings in VMware
Cool - thanks!
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тАО04-20-2013 02:32 PM
тАО04-20-2013 02:32 PM
Re: Importance of path change settings in VMware
Made the change. My SQLIO test throughput on 10G on Reads went from ~470 MB/s to ~715 MB/s. Have a CS240G. NICE!
-Craig
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тАО04-22-2013 10:13 AM
тАО04-22-2013 10:13 AM
Re: Importance of path change settings in VMware
wow nice to hear Craig!
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тАО04-25-2013 04:40 PM
тАО04-25-2013 04:40 PM
Re: Importance of path change settings in VMware
I may be wrong, but when making the change to --iops=0 & --bytes=0, it looks like you have to set '--type' to 'iops'. I tried it using '--type=bytes' as written in the script above, but the iops limit didn't change.
Result when run with --type=bytes:
Device: eui.xxx
IOOperation Limit: 1000
Limit Type: Bytes
Use Active Unoptimized Paths: false
Byte Limit: 0
After, when run with --type=iops:
Device: eui.xxx
IOOperation Limit: 0
Limit Type: Bytes
Use Active Unoptimized Paths: false
Byte Limit: 0
From the help text:
-t|--type=<str>
Set the type of the Round Robin path switching that should be enabled for this device.
Valid values for type are:
bytes: Set the trigger for path switching based on the number of bytes sent down a path.
default: Set the trigger for path switching back to default values.
iops: Set the trigger for path switching based on the number of I/O operations on a path.
Cheers,
Eric
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тАО05-03-2013 09:25 AM
тАО05-03-2013 09:25 AM
Re: Importance of path change settings in VMware
I just ran the command twice, one to set bytes, and then one to set IOPS. Since there is a Limit Type, I'm not sure if it matters if you changed bytes to 0 if the Limit Type is set to Iops.
My notes from another post:
In the SSH console on ESXi 5.1, this command will loop through each datastore setting Bytes to 0, IOPS to 0 and then display the current settings. For some reason, when listing disks, they show up twice, once with their regular ID and a second time with the ID ending in :1 and the settings can't be applied.
for i in `ls /vmfs/devices/disks/ | grep eui.` ; do echo $i ; esxcli storage nmp psp roundrobin deviceconfig set -d $i -t bytes -B 0; esxcli storage nmp psp roundrobin deviceconfig set -d $i -t iops -I 0 ;esxcli storage nmp psp roundrobin deviceconfig get -d $i; done
If you want it set back to defaults how it came out of the box, this will reset Bytes to 10485760, IOPS to 1000, and Type to default
for i in `ls /vmfs/devices/disks/ | grep eui.` ; do echo $i ; esxcli storage nmp psp roundrobin deviceconfig set -d $i -t bytes -B 10485760; esxcli storage nmp psp roundrobin deviceconfig set -d $i -t iops -I 1000 ; esxcli storage nmp psp roundrobin deviceconfig set -d $i -t default; esxcli storage nmp psp roundrobin deviceconfig get -d $i; done