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ESXi notes

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paolo.macor

Oh yes, you are right. I forgot to mention i'm running on vsa -88OEM

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rotor

Have you tried the same benchmarks in RAID mode with the SSDs in the same slots? AHCI mode under ESXi mode --as far as I've experienced myself, and read on this forum-- is terrible. Only the first 2 slots are SATA 3. AHCI mode gives you a tiny queue length, which has pretty grim consequences for real life performance (even if artificial benchmarking shows ok performance).

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paolo.macor

@rotor

No I haven't, but I'm just curious so I will try. But let me say I'm very satified by these performances. In raid mode with single MAGNETIC HDDs in RAID 0 on same VM i got results 10 times slower. I think 550MB per second are quite the limit of the drives, and near to SATA3 saturation.

My only problem is I cannot use any of the magnetic disks, because this leads esxi in a very unstable status.

 

The menining of my first post is: if you -as me - are unsatisfied by b120i under esxi even if you downgraded vsa driver, you can use SSD HDD with controller in AHCI and you'll get top performance!

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rotor

My point is that you compared magnetic disks under RAID mode with SSD under AHCI mode -- that's not exactly a fair comparison! AHCI mode with ESXi is unstable and I wouldn't recommend it under any circumstances.

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paolo.macor

hi rotor, and thankyou for your reply.

 

I agree regarding the fair comparision. But I disagree about the unstability, and this was the reason of my post:

- if I use magnetic HDDs in AHCI in my Gen8, ESXi gets VERY unstable.

- if I use SSDs in AHCI gets VERY FAST AND VERY STABLE (this is nitty gritty!). it's 20 days right now I'm running this configuration without any problem.

- the only way having magnetic disks running is setting B120i in RAID mode but performances are ridiculous.

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rotor

I have both SSD and magnetic under RAID mode on my Gen8. On the magnetic disks I am more or less maxing out the speed of the drive (130+ MBps), so I have no complaints. Where did you get the idea that performance with magnetic disks under RAID mode is ridiculous?

 

- Latest firmware

- ESXi 6

- HP storage driver build 88, latest everything else

- RAID mode

 

Yields excellent performance, 100% stability, 6% fan speed.

 

AHCI is slower (per benchmarks, and with the dramatically smaller queue length will be slower in real world activity), is unstable, and gives a higher fan speed.

 

I encourage you to re-do your tests under RAID mode.

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paolo.macor

ESXi 6.0.0, 3029758

ROM J06 07/16/2015

VSA scsi-hpvsa-5.5.0-88OEM.550.0.0.1331820.x86_64

RAID 0 volume n single HDD WD RED 3TB

RAID0_2.pngfans.png

 

 

as you can see I already made the test in RAID0 wth magnetic HDD a month ago;

as you can see it reports ridiculous performances of the subsystem. 

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rotor

ESXi 6.0.0 3073146

scsi-hpvsa build 88

 

I suspect the drops above 256kB transfer size are directly related to the logical drive stripe size (256kB in my case). I am very happy with these results. Note, these are configured as RDMs in a Windows 2012 R2 VM.

 

WD Red 3TB

2015-12-15_125147.png

 

WD Red 6TB

2015-12-15_125454.png

 

Fan speed

2015-12-15_125249.png

 

Example logical drive configuration

2015-12-15_130716.png

 

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paolo.macor

thank you rotor for posting your config and performance tests; they will be useful for reference.

Thanks also for letting me know that I should update my host ;)

Me too I prefer using  RDMs so I have native filesystem on single disks.

I will try SSDs RAID0 config to avoid shorter command queue and I'll post results.

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CyberMacGyver

Hi all!

 

I'm so [psyched! Just got my new Gen8 Microserver!

 

I plan to deploy ESXi 6U1 on it, and am wondering if anyone has tried it, and if it still suffers from the storage performance issues with the controller driver? Should I still downgrade the RAID driver with 6Up1?

 

Also, do you guys use the VMware version from HP or the vanilla one?

 

Thanks!

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