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April 23rd, 2022 02:00
SSD DISK PERFORMANCE
Hello. We are using a Dell Poweredge R720XD and it has ESXi 6.7 installed. Disks where on the server stand very low speed works. As a solution, I recently added SSD disks to the server. I did not configure RAID on these SSD drives, I mounted them directly in ESXi. This SSD drive is somehow very limited in speed. The speed of writing and reading does not rise above 20MB/S. It's been a week and I still can't solve this problem.
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DELL-Young E
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April 24th, 2022 21:00
Hi, thanks for choosing Dell. Did you connect the SSD with the PERC? Could you tell us more about it?
Shakhzod667
6 Posts
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April 25th, 2022 04:00
Hi, yes I have connected it to an embedded PERC H310 Mini. I have 6 SAS drives and they are configured for RAID-1 and this ssd drive is connected directly to PERC.
Shakhzod667
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April 25th, 2022 05:00
You misunderstood me a little. Here we are talking about the slow work of SSD drives. And here RAID? Can you tell me which SSD drives are certified by Dell?
DELL-Erman O
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April 25th, 2022 05:00
Hi,
If the SSDs are in non-raid mode, you can try each SSD as individually RAID 0. Normally, drives that are used alone most of the time are not used in non-raid mode. In such cases, RAID 0 configuration is preferred for each disk. There may be also a compatibility issue if SSDs are not Dell-certified.
DELL-Erman O
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April 25th, 2022 06:00
You can get information about compatible SSDs by contacting your sales representative. I am not aware that there is a list of compatibility drives public. I can share a few SSD part codes from the spare parts section. But there may be an issue with the SSD driver on the ESXI side. I've read that native driver causes some performance issues. Disabling the native driver and activating the old SATA-AHCI driver may be the solution. I saw this article https://dell.to/3rNTikg;
Disable a Native Driver:
esxcli system module set --enabled=false --module=native_driver_name
For example, to disable the qflge native driver, run the following vCLI command:
esxcli system module set --enabled=false --module=qflge
esxcli system module list
Stateless hosts exit maintenance mode automatically after reboot.
Shakhzod667
6 Posts
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May 11th, 2022 01:00
Hello. Haven't been here for a long time. Please tell me on my DELL Poweredge R720xd when I install an SSD there should caching be disabled? Or in general, when I add an SSD, what settings should be done so that the speed of the disk does not drop.