Slow disk writes VM 3.1

I know I must have something configured wrong but I can't figure it out.
I have tested disk write access on my VM servers in V2.2 and V3.1, using these commands:
hdparm -tT /dev/mapper/<lun>
and
dd if=/dev/zero of=output.img bs=8k count=256k
the output is very close between the V2.2 and V3.1 servers, so that's good.
But then when I execute those command on the actual VMs themselves within the 2.2 and 3.1 environments, I get different results.
The hdparm command is still equivalent between the two.
But the dd command shows my old V2.2 VMs getting around 650mb/s while my new V3.1 VMs are getting between 8mb-30mb/s. Does anyone have an idea off the top of their head why this would be?
Oh, I just tried one more thing... most of my V3.1 VMs were converted from V2.2 via template import. I just tried the same commands on a couple of new VMs I made in V3.1 (from OL6-64bit templates) and they returned 360mb/s and 750mb/s. So I wonder what's wrong with the VMs that I converted from VM2.2?

Hi there,
We're having exactly the same problem as you appear to have experienced. Very slow write I/O in guest VMs (domU) but fast I/O on the host on the same iSCSI file system.
Write I/O inside the guest is between 3-20MB/sec (dd bs=2048k count=512), whereas on the host its 95MB/sec - which is hitting the practical limits of our GigEth iSCSI SAN.
I've checked inside the guests and can see no problems of write caches being disabled in dmesg. Curiously we hit this same wall on both a RHEL6.3 and Solaris10U10 guest.
I've tried both sparse and non-sparse files and the performance is the same. Read performance is fine, but this write bottleneck is a showstopper. Would appreciate any assistance you guys might have while I await a response from Oracle..
Setup:
- Oracle VM 3.1.1 update 485
- Sun Fire X4150 Server
- Sun Storagetek 2510 iSCSI SAN

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Hi all,
Here is the list of all what went wrong and where I am now:
1. My Ipod worked well
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Hi Cyrille,
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New Mac with major permission and disk-write problems

Right, so I'm pretty new to Mac, after getting my first Mac computer (a 17-inch MacBook Pro) at the end of January this year. It's been great so far and I love the thing, but I've suddenly encountered some crazy problems which I'm pulling my hair out over because I have tried everything to fix them, and have had no luck.
I'll try to include as many details as possible, and I'm prepared to bear with anyone who asks me about something I've alrady tried, just so I can get this sorted.
Okay, so first of all, the main problem seems to be with permissions, mostly with disk-write permissions. Any apps that I want to install that required keychain access will no longer install. I enter my keychain password, hit Return, and the dialog box closes without continuing. So I hit "Install" again and it becomes a never-ending cycle of entering my password to no avail. Now, this happens with ANY application that requires keychain access to install. It is not limited to any particular application. I know my password is right because the box closes, and if I enter it wrong, the dialog box shakes because it is incorrect.
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From here, it gets worse. If I download something (anything), then restart my computer, it is still there. As it should be. However, if I delete an APPLICATION (not just any file) OR change preferences for some programs (one in particular that I specifically don't want starting up on.... startup), including through System Preferences>Users & Groups>Login Items, they will not save. This is driving me insane. For instance, I downloaded some free apps from the Mac App Store to try out, but decided I didn't want them. I tried to deleted them from the app folder and succeeded. Emptied trash. Gone. Restart, and.... they're back? So I tried to uninstall them via the Mac App Store, once I found you could do that. Again, it didn't work. Any Login Items preference changes don't stay after a restart.
Originally, none of this was a problem and everything was working fine. The first sign that something was wrong would be Apple Mail often asking for passwords, usually for my Hotmail accounts, saying that they were rejected by the server (but are correct passwords, I get the emails from the accounts, and the passwords are always accepted once I type them in, only to be asked for them some time later on for no apparent reason). At the time, I tried to repair the keychain, tried deleting and recreating the mail account entries and what not, but nothing helped. It still happens, but at the time, it was more of a niggly thing than an outright problem.
I should also mention that I did use BootCamp to install Windows 8 on a small partition, but after I couldn't boot back into Mac (I didn't realise you had to use the Option key whilst booting), I found out that you had to hold the Option key to get back into Mac, then used BootCamp to get rid of Windows. Everything was fine so far. Until I decided to reinstall Windows 8 with BootCamp. This is where things started going wrong. I decided to install a bootloader to make it easier for me to boot between the two systems. I was tossing up between rEFIt and Chameleon, and decided that rEFIt would be the best for my needs. So I downloaded and installed it, which seemed to go fine. Until I restarted. Mac would endlessly load (the spinning grey dots with the Apple logo).
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I should also mention that keychain access isn't completely non-existent for me. Setting up a new WiFi connection worked for me (that is, connecting to a new network), but now every time I connect to the network, I have to authenticate it. However, it does accept my keychain password and eventually connect.
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If anyone can help me, I'd greatly appreciate it. I have tried many things, so if you suggest something that I have tried and possibly forgot to mention, I'll let you know, but any help is still helpful, even if only eliminating possible problems/causes/solutions.

Actually you first post is so long that most people just glance at it and move on. To say the least you are very verbose.
Your problem stems from something going wrong with permissions, as you know. How and why that happen is usually a user error of some type.
You can try to repair permissions and see if that corrects it. If not I will leave other options to someone that may know more about the permission system on a Mac.

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hello i have a problem with my macbook pro become to slow to write any thing, to do any thing and the fan is always on never stop what can i do?
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Hey guys,
I recently picked Looking at iotop 05:39:13 6814 be/4 evan 05:39:13 331 be/3 root 05:39:17 6799 be/4 evan 05:39:17 6811 be/4 evan 05:39:17 331 be/3 root 05:39:17 6799 be/4 evan 05:39:18 6794 be/4 evan 05:39:18 6799 be/4 evan 05:39:18 6799 be/4 evan 05:39:18 6827 be/4 evan 05:39:19 6799 be/4 evan 05:39:19 6799 be/4 evan 05:39:20 6799 be/4 evan 05:39:21 6799 be/4 evan 05:39:21 6799 be/4 evan 05:39:21 6814 be/4 evan 05:39:22 6796 be/4 evan 05:39:22 6799 be/4 evan 05:39:23 6799 be/4 evan 05:39:24 162 be/4 root 05:39:25 6796 be/4 evan 05:39:26 331 be/3 root 05:39:26 6844 be/4 evan 05:39:28 6835 be/4 evan 05:39:28 331 be/3 root 05:39:28 6827 be/4 evan 05:39:28 6796 be/4 evan 05:39:29 6794 be/4 evan 05:39:36 6799 be/4 evan 05:39:37 331 be/3 root 05:39:37 6835 be/4 evan 05:39:37 6799 be/4 evan 05:39:38 6799 be/4 evan 05:39:38 6811 be/4 evan 05:39:38 6827 be/4 evan 05:39:38 6844 be/4 evan 05:39:39 6827 be/4 evan 05:39:39 331 be/3 root 05:39:39 6814 be/4 evan 05:39:40 331 be/3 root 05:39:40 6796 be/4 evan 05:39:40 6811 be/4 evan 05:39:41 6796 be/4 evan Even with the plugin Any ideas why it's Last edited up a SSD and have become extreamly paranoid of applications doing too much writing too it.
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0.00 K/s 160.66 K/s 0.00 % 2.15 % libpepflashplayer.so --ppapi-flash-version=11.8.800.97 [BrowserBlocking]
0.00 K/s 14.61 K/s 0.00 % 1.13 % [jbd2/sda4-8]
0.00 K/s 7.30 K/s 0.00 % 0.00 % libpepflashplayer.so --ppapi-flash-version=11.8.800.97 [Chrome_CacheThr]
0.00 K/s 331.91 K/s 0.00 % 3.64 % libpepflashplayer.so --ppapi-flash-version=11.8.800.97 [Chrome_DBThread]
0.00 K/s 7.38 K/s 0.00 % 0.00 % libpepflashplayer.so --ppapi-flash-version=11.8.800.97 [Chrome_CacheThr]
0.00 K/s 501.13 K/s 0.00 % 0.00 % libpepflashplayer.so --ppapi-flash-version=11.8.800.97 [Chrome_CacheThr]
0.00 K/s 103.17 K/s 0.00 % 0.00 % libpepflashplayer.so --ppapi-flash-version=11.8.800.97 [Chrome_HistoryT]
0.00 K/s 1250.51 K/s 0.00 % 0.00 % libpepflashplayer.so --ppapi-flash-version=11.8.800.97 [Chrome_CacheThr]
0.00 K/s 1377.86 K/s 0.00 % 0.00 % libpepflashplayer.so --ppapi-flash-version=11.8.800.97 [Chrome_CacheThr]
0.00 K/s 2078.74 K/s 0.00 % 0.00 % libpepflashplayer.so --ppapi-flash-version=11.8.800.97 [Chrome_CacheThr]
0.00 K/s 118.37 K/s 0.00 % 0.00 % libpepflashplayer.so --ppapi-flash-version=11.8.800.97 [Chrome_CacheThr]
0.00 K/s 689.73 K/s 0.00 % 0.00 % libpepflashplayer.so --ppapi-flash-version=11.8.800.97 [Chrome_CacheThr]
0.00 K/s 7.34 K/s 0.00 % 0.00 % libpepflashplayer.so --ppapi-flash-version=11.8.800.97 [BrowserBlocking]
0.00 K/s 59.51 K/s 0.00 % 0.00 % libpepflashplayer.so --ppapi-flash-version=11.8.800.97 [Chrome_FileThre]
0.00 K/s 676.88 K/s 0.00 % 0.00 % libpepflashplayer.so --ppapi-flash-version=11.8.800.97 [Chrome_CacheThr]
0.00 K/s 7.40 K/s 0.00 % 0.00 % libpepflashplayer.so --ppapi-flash-version=11.8.800.97 [Chrome_CacheThr]
0.00 K/s 140.07 K/s 0.00 % 0.00 % systemd-journald
0.00 K/s 66.80 K/s 0.00 % 0.00 % libpepflashplayer.so --ppapi-flash-version=11.8.800.97 [Chrome_FileThre]
0.00 K/s 162.95 K/s 0.00 % 0.62 % [jbd2/sda4-8]
0.00 K/s 22.22 K/s 0.00 % 0.10 % libpepflashplayer.so --ppapi-flash-version=11.8.800.97 [BrowserBlocking]
0.00 K/s 207.50 K/s 0.00 % 0.99 % libpepflashplayer.so --ppapi-flash-version=11.8.800.97 [Chrome_SyncThre]
0.00 K/s 14.81 K/s 0.00 % 1.87 % [jbd2/sda4-8]
0.00 K/s 118.50 K/s 0.00 % 0.85 % libpepflashplayer.so --ppapi-flash-version=11.8.800.97 [Chrome_HistoryT]
0.00 K/s 22.22 K/s 0.00 % 0.09 % libpepflashplayer.so --ppapi-flash-version=11.8.800.97 [Chrome_FileThre]
0.00 K/s 44.46 K/s 0.00 % 1.15 % libpepflashplayer.so --ppapi-flash-version=11.8.800.97 [Chrome_DBThread]
0.00 K/s 51.79 K/s 0.00 % 0.00 % libpepflashplayer.so --ppapi-flash-version=11.8.800.97 [Chrome_CacheThr]
0.00 K/s 124.82 K/s 0.00 % 1.60 % [jbd2/sda4-8]
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0.00 K/s 14.75 K/s 0.00 % 0.00 % libpepflashplayer.so --ppapi-flash-version=11.8.800.97 [BrowserBlocking]
0.00 K/s 88.51 K/s 0.00 % 0.00 % libpepflashplayer.so --ppapi-flash-version=11.8.800.97 [Chrome_HistoryT]
0.00 K/s 7.42 K/s 0.00 % 0.00 % libpepflashplayer.so --ppapi-flash-version=11.8.800.97 [BrowserBlocking]
0.00 K/s 14.59 K/s 0.00 % 0.00 % libpepflashplayer.so --ppapi-flash-version=11.8.800.97 [Chrome_HistoryT]
0.00 K/s 44.04 K/s 0.00 % 0.74 % [jbd2/sda4-8]
0.00 K/s 249.55 K/s 0.00 % 0.14 % libpepflashplayer.so --ppapi-flash-version=11.8.800.97 [BrowserBlocking]
0.00 K/s 21.77 K/s 0.00 % 0.75 % [jbd2/sda4-8]
0.00 K/s 217.73 K/s 0.00 % 0.09 % libpepflashplayer.so --ppapi-flash-version=11.8.800.97 [Chrome_FileThre]
0.00 K/s 21.77 K/s 0.00 % 0.03 % libpepflashplayer.so --ppapi-flash-version=11.8.800.97 [BrowserBlocking]
0.00 K/s 7.40 K/s 0.00 % 0.00 % libpepflashplayer.so --ppapi-flash-version=11.8.800.97 [Chrome_FileThre]
disabled in chrome://plugins I still see the same ammount of IO.
making so many writes?
by EvanPurkhiser (2013-07-19 09:51:38)

EvanPurkhiser wrote:I recently picked up a SSD and have become extreamly paranoid of applications doing too much writing too it.
As long as you bought a decent SSD, I wouldn't worry about this too much. In the early days, when the firmware was still you and it sucked, the wear levelling didn't work properly and disks would prematurely die. But these days, with new disks, it has been found that the controller will likely die long before the flash wears out.
I have a Samsung 840 250GiB, which as you may or may not know, is Triple Level Cell (TLC). If you also know anything about SSD flash, the originals were Single Level Cell and the SLC these days can sometimes do 100,000 write cycles. Multi-Level Cell (MLC) consumer disks are typically rated for 3000 to 5000 write cycles. So as you can guess, this means my TLC is significnatly lower than the MLC. But I have seen a couple tests with these 840s, where it was just constantly written to at a write amplification of 1 (you'll never actually see this low of a write amplification in real life), and it lasted for several months. At that level, it was determined that under "normal use" it would last something like ~160 years. Even with a rather high write amplification of 10, that would still be 16 years. So don't worry about it. Just use it.
In any case, I also don't like how much chromium writes to the disk, but this would be the case whether I was using an SDD or an HDD. So I use the /etc/chromium/default config to also add "--disk-cache-dir=/tmp". This is also where those pappi switches can be found (the post_install function of the pappi package writes this for you). That switch will make a directory /tmp/Cache, where chromium will store its cached web pages. This would otherwise be in ~/.cache/chromium/Cache I believe. Your normal profile, passwords, form info, bookmarks, etc. are all stored in ~/.config, so you don't be losing any of that.

Slow disk writes VM 3.1

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