Geekzone: technology news, blogs, forums
Guest
Welcome Guest.
You haven't logged in yet. If you don't have an account you can register now.




The Game.
2861 posts

Uber Geek
+1 received by user: 439

Trusted
Think Concepts
Subscriber

Topic # 138871 20-Jan-2014 15:29 Send private message

Hi all, I'm having a bit of a problem with my Microserver running ESXi 5.5, when transferring from one drive to another it starts off at about 70MB/sec then goes right down to anywhere between 5MB/sec to 8MB/sec. I've replaced the drives, reinstalled ESXi and completely reinstalled Server 2012 on the main VM. It doesn't matter if the drives are thick or thin provisioned and the server has also got plenty of ram. Any ideas what may be causing the slow transfer speed?





Michael Murphy
[Twitter] [Last.fm] [IPv6 Sage]

Everything I say here is my own opinion and not that of my employer.

Create new topic
2958 posts

Uber Geek
+1 received by user: 167

Trusted
Subscriber

  Reply # 970057 20-Jan-2014 15:44 Send private message

Does your disk controller have write back mode enabled?







The Game.
2861 posts

Uber Geek
+1 received by user: 439

Trusted
Think Concepts
Subscriber

  Reply # 970058 20-Jan-2014 15:46 Send private message

Zeon: Does your disk controller have write back mode enabled?


Hmm this might be something I'll have to check. From memory this involves flashing a modified bios image to enable / disable.




Michael Murphy
[Twitter] [Last.fm] [IPv6 Sage]

Everything I say here is my own opinion and not that of my employer.

2958 posts

Uber Geek
+1 received by user: 167

Trusted
Subscriber

  Reply # 970064 20-Jan-2014 15:52 Send private message

Are your disks just plugged into the motherboard's disk controller? Usually your RAID card would have an option and you would only turn it on with a battery backed unit. I believe this is because VMFS isn't like NTFS etc. where consecutive operations run fine on just normal disks - ie I think VMFS is more random hence the lower performance.





401 posts

Ultimate Geek
+1 received by user: 61

Trusted
Subscriber

  Reply # 970065 20-Jan-2014 15:53 Send private message

Hi

I understand you have two virtual hard drives on a virtual Windows 2012 server and this all runs on ESXi. What is the physical drive configuration of the ESXi server - number of drives, type, controller?

Also, have you installed VMtools in the guest?

If you boot the server to a live Linux distribution, like Ubuntu, what is the output of testing tools, like hdparm as shown here: http://askubuntu.com/questions/87035/how-to-check-hard-disk-performance



The Game.
2861 posts

Uber Geek
+1 received by user: 439

Trusted
Think Concepts
Subscriber

  Reply # 970153 20-Jan-2014 17:18 Send private message

gundar: Hi

I understand you have two virtual hard drives on a virtual Windows 2012 server and this all runs on ESXi. What is the physical drive configuration of the ESXi server - number of drives, type, controller?

Also, have you installed VMtools in the guest?

If you boot the server to a live Linux distribution, like Ubuntu, what is the output of testing tools, like hdparm as shown here: http://askubuntu.com/questions/87035/how-to-check-hard-disk-performance


I've tested drive performance outside of ESXi and it all works fine. I've got 1x 250gb drive, 1x 1tb drive and 1x 4tb drive plugged into the Microserver's motherboard direct. Nothing fancy like raids or anything. There's VMtools on the guests.

The controller is the one that is direct on the motherboard on the Microserver.




Michael Murphy
[Twitter] [Last.fm] [IPv6 Sage]

Everything I say here is my own opinion and not that of my employer.

2958 posts

Uber Geek
+1 received by user: 167

Trusted
Subscriber

  Reply # 970161 20-Jan-2014 17:29 Send private message

Yea you need to read up about VMFS and lack of write back cache I think. It makes a HUGE difference and I think is really a requirement. Maybe you can pass the disk raw into your VM?







The Game.
2861 posts

Uber Geek
+1 received by user: 439

Trusted
Think Concepts
Subscriber

  Reply # 970177 20-Jan-2014 17:54 Send private message

Zeon: Yea you need to read up about VMFS and lack of write back cache I think. It makes a HUGE difference and I think is really a requirement. Maybe you can pass the disk raw into your VM?


By default the Microserver emulates IDE on the drives, I've flashed a modified BIOS and changed this. The embedded controller does support write caching but is not battery backed so possibly not the best thing to enable. It's strange though since I don't remember it ever being this bad.




Michael Murphy
[Twitter] [Last.fm] [IPv6 Sage]

Everything I say here is my own opinion and not that of my employer.

1931 posts

Uber Geek
+1 received by user: 232

Trusted
Subscriber

  Reply # 970179 20-Jan-2014 17:59 Send private message

Not the first time I've seen people complain about slow disk performance in 2012. Also make sure you don't have any fancy file system dedupe features enabled in your guest.

Infrastructure Geek
3644 posts

Uber Geek
+1 received by user: 73

Trusted
Microsoft NZ
Subscriber

  Reply # 970310 20-Jan-2014 21:27 Send private message

you're obviously extracting a RAR archive from "location A" to "location B". As part of the process, RAR uses a temporary location (typically the same folder as the archive) for the temporary extracted file(s). This typically means that you're doing disk read I/O's and disk write I/O's to the same volume in the first instance. If you have three disks/spindles, it can often speed it up if you can set the RAR temporary extraction path to the third disk.

whats the I/O like when you simply copy a file from disk to disk?

Create new topic




Twitter »
Follow us to receive Twitter updates when new discussions are posted in our forums:



Follow us to receive Twitter updates when news items and blogs are posted in our frontpage:



Follow us to receive Twitter updates when tech item prices are listed in our price comparison site:




News »

Trending now »
Hot discussions in our forums right now:

Dirty Politics: Nicky Hager's New Book
Created by ajobbins, last reply by Glassboy on 20-Aug-2014 17:57 (264 replies)
Pages... 16 17 18


CGA. Is it fair?
Created by BTR, last reply by Tzoi on 20-Aug-2014 20:48 (36 replies)
Pages... 2 3


Free: Smart Button for your Android device
Created by freitasm, last reply by eXDee on 20-Aug-2014 19:21 (89 replies)
Pages... 4 5 6


It was hardly 'hacking' was it?
Created by CB_24, last reply by BarTender on 19-Aug-2014 22:36 (87 replies)
Pages... 4 5 6


Shortening the DSL loop on a long driveway
Created by hio77, last reply by hio77 on 20-Aug-2014 21:00 (27 replies)
Pages... 2


Vodafone now charging you to receive a bill via post
Created by stocksp, last reply by richms on 20-Aug-2014 19:28 (79 replies)
Pages... 4 5 6


NZ Transport Agency: Snapchat
Created by freitasm, last reply by NzBeagle on 20-Aug-2014 19:27 (44 replies)
Pages... 2 3


Vodafone TV multicast settings on pfSense?
Created by kenkeniff, last reply by hio77 on 21-Aug-2014 01:43 (64 replies)
Pages... 3 4 5



Geekzone Live »
Try automatic live updates from Geekzone directly in your browser, without refreshing the page, with Geekzone Live now.

Are you subscribed to our RSS feed? You can download the latest headlines and summaries from our stories directly to your computer or smartphone by using a feed reader.

Alternatively, you can receive a daily email with Geekzone updates.