It’s time to start planning your #VMworld 2019 Europe trip. Make sure you don’t miss a moment, check out some of our exciting keynotes and sessions: https://t.co/nA0C0rxvyu #MakeYourMark #VMworld
It’s time to start planning your #VMworld 2019 Europe trip. Make sure you don’t miss a moment, check out some of our exciting keynotes and sessions: https://t.co/nA0C0rxvyu #MakeYourMark #VMworld
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As per vendor recommendation we have to change the settings on storage and VMware environment.So, I decided to change the setting on ESXi for IOPS.
ESXi Round Robin PSP (Path Selection Plug-in) uses a round-robin algorithm to balance the load across all active storage paths. A path is selected and used until a specific quantity of data has been transferred. After that quantity is reached, the PSP selects the next path in the list.
The quantity at which a path change triggered is known as the limit.
ESXi Round Robin PSP supports two types of limits:
IOPS limit: The Round Robin PSP defaults to an IOPS limit with a value of 1000. In this default case, a new path is used after 1000 I/O operations are issued.
Bytes limit: The bytes limit is an alternative to the IOPS limit. The bytes limit allows for a specified amount of bytes to be transferred before the path is switched.
Adjusting the limit can provide a positive impact to performance and is recommended by some storage vendors to change IOPS limit to 1.
Reference: VMware KB 2069356
All My datastores are using Round Robin policy.
Now Login into ESXi hosts via putty.
Run this command to see what is default or current value set.
>esxcli storage nmp device list you can see below output:
eui.018c7bf1773f0b88
Device Display Name: STARWIND iSCSI Disk (eui.018c7bf1773f0b88) Storage Array Type: VMW_SATP_ALUA Storage Array Type Device Config: {implicit_support=on; explicit_support=off; explicit_allow=on; alua_followover=on; action_OnRetryErrors=on; {TPG_id=1,TPG_state=AO}} Path Selection Policy: VMW_PSP_RR Path Selection Policy Device Config: {policy=rr,iops=1000,bytes=10485760,useANO=0; lastPathIndex=0: NumIOsPending=3,numBytesPending=1524224} Path Selection Policy Device Custom Config: Working Paths: vmhba65:C0:T0:L1 Is USB: false
Now we are going to run the command to change the IOPS.
for i in `esxcfg-scsidevs -c |awk ‘{print $1}’ | grep eui.018c7bf1773f0b88`; do esxcli storage nmp psp roundrobin deviceconfig set –type=iops –iops=1 –device=$i; done
replace eui or naa id as per your organisation configuration.
Output will be:
Note:
You have to run this command on each ESXi hosts and per LUN basis.
You do not need to restart the host for the changes to take effect.
Testing the result:
I am running IOMeter to test the speed.
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Measurements of storage device command latency (DAVG/cmd) may generate higher or lower values than expected, if not all commands within the sample complete at the same speed. Most storage device commands complete quickly (< 25ms), but a small number of commands (such as XCOPY, used in VAAI) may take significantly longer to complete.
1. Start esxtop by typing esxtop at the command line.
2. Press d to switch to disk view (HBA mode).
3. To view the entire Device name, press SHIFT + L and enter 36 in Change the name field size.
4. Press f to modify the fields that are displayed.
5. Press b, c, d, e, h, and j to toggle the fields and press Enter.
6. Press s and then 2 to alter the update time to every 2 seconds and press Enter.
1. Start esxtop by typing esxtop from the command line.
2. Press u to switch to disk view (LUN mode).
3. Press f to modify the fields that are displayed.
4. Press b, c, f, and h to toggle the fields and press Enter.
5. Press s and then 2 to alter the update time to every 2 seconds and press Enter.
1. Start esxtop by typing esxtop at the command line.
2. Press u to switch to the disk device display.
3. Press L to change the name field size.
Note: Ensure to use uppercase L.
4. Enter the value 36 to display the complete naa identifier.
1. Start esxtop by typing esxtop at the command line.
2. Type v to switch to disk view (virtual machine mode).
3. Press f to modify the fields that are displayed.
4. Press b, d, e, h, and j to toggle the fields and press Enter.
5. Press s and then 2 to alter the update time to every 2 seconds and press Enter.
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