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04-20-2015 02:15 PM
04-20-2015 02:15 PM
Help! Very slow Disk I/O on G1610T Gen8 and ESXi
Hi,
I just bought and configured a G1610T Gen8 Microserver, I upgraded it with:
16 Gb
Xeon 1240V2
And added 4x disks WD Red 3Tb each
Configured a Raid 10
Installed ESXi (HP custom) vSphere 6.0 on a 16Gb SD card
Installed a fresh Ubuntu VM, installed VMware tools
Everything seemed to be good... but then I noticed things were slow...
I did probide 4Gb of Ram and 1 Virtual Socket with 2 Core to the VM.
There is no other VM and every settings are default.
Running the following command on the VM to test writting speed:
sudo hdparm -Tt /dev/sda
gives me the following:
Timing cached reads: 19800 MB in 2.00 seconds = 9907.62 MB/sec
Timing buffered disk reads: 150 MB in 3.11 seconds = 48.15 MB/sec
On an old iMac running VMware fusion 7 a similar VM gives me the following results for the same command:
Timing cached reads: 10594 MB in 2.00 seconds = 5298.41 MB/sec
Timing buffered disk reads: 1152 MB in 3.01 seconds = 383.12 MB/sec
It looks like my Buffered Disk read is having some issues on my Gen8 server...
Worse.. trying the following test on The Gen8 and iMac:
time sh -c "dd if=/dev/zero of=tmp1 bs=8k count=1000000 && sync"
on my iMac it completes in 16s
On my Gen8 it completes in over 4 minutes!
Granted, I am new to the microserver, and also new to ESX!
My experience is with vmware for desktop.
This setup is not for work/production but for a lab at home I wanted to run.
I might have missed something very obvious!
But after batteling a whole weekend learning how to set all this up (iLO, Raid, ESX), I am just about to give up and send everything back.
So disapointed! I seem to have come so close but I just can't find out what is wrong with my setup so access/write to the disk is so slow on my Gen8.
I understand there could be issues with either my Raid setup (just using the B120i) but I am using all default settings or with my ESXi config (but then again, all default settings).
If anyone can help that would be greatly appreciated. I really want this to work, but I seem to have hit a wall!
Thanks
Gavin.
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04-20-2015 03:13 PM
04-20-2015 03:13 PM
Re: Help! Very slow Disk I/O on G1610T Gen8 and ESXi
It is because "new" hpsva driver (versions 090 and 092). Downgrade to 088 solves low I/O problems.
Read further here (from 13 April) - http://homeservershow.com/forums/index.php?/topic/9141-low-io-performance-with-esxi-60/page-3
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04-21-2015 12:40 AM
04-21-2015 12:40 AM
Re: Help! Very slow Disk I/O on G1610T Gen8 and ESXi
Thanks so much ArnisR!
That really helped!!
I think there is still an issue... installing the older driver really did improve the performance but it is still slower than my old computer which doesnt make sense..
I am now getting
> sudo hdparm -tT /dev/sda
/dev/sda:
Timing cached reads: 20618 MB in 2.00 seconds = 10317.72 MB/sec
Timing buffered disk reads: 428 MB in 3.00 seconds = 142.59 MB/sec
That went from 50 MB/sec to 142 Mb/Sec
And creating the 8Gb test file went from 4 min to 2 min...
but the iMac still does it in 16s!
If you have any idea on how to improve further I am listening :)
I will also check on the forum from the link you provided.
If not completly fixed, it is already a great improvement and the wall is starting to crack :)
Thanks so much.
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04-21-2015 01:45 AM
04-21-2015 01:45 AM
Re: Help! Very slow Disk I/O on G1610T Gen8 and ESXi
iMac is cheating (if it have HDD not SSD) Even 4 fastest HDD in RAID0 cannot create 8 GB of 8k blocks in 16 sec. 1 million I/O in 16 s = 62 kIOps, it is not real for HDD.
Try /dev/urandom instead of /dev/zero. And check when really disk finished activity.
I also enabled physical write cache of disks on B120i (I have UPS).
There is also newer HP ESXi image from 30 March (hpsva driver should be reverted after upgrade)