Hardware :: Poor Write Speeds With RAID5 On 10.10
Jul 21, 2011
I am getting extremely poor write speeds with my RAID. My setup is as follows: > HP Proliant Microserver > 4 2TB Samsung F4 drives > 60GB root drive > Ubuntu 10.10 64bit > mdadm 3.2.2. I have two of the above servers, connected via gigabit LAN. The read speeds I am happy with, but write speeds are running at about 20Mb/s at the very best, Especially when people with a similar setup on a machine like this are running at about 90MB/s write speeds. My array is as follows (mdadm --detail -D /dev/md0):
[code]...
I have also started the partitions at 64 instead of 63 in a bid to correctly align the partitions, although this doesn't seem to have made any difference.
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Nov 11, 2010
Linux beginner, first project is a NAS based on Debian Lenny. Have SMB and AFP running. Hooked to a gigabit network. 8 disk RAID6 with mdadm. Need the NAS to back up our production company's video files.First attempt at back up was very, very slow on smb and afp. Used a Mac disk benchmark app, shows 100+MBps reads, but only .4MBps (as in 400kbps!) writes. Went through office LAN, and also tried just cabling the two machines (MacPro and Debian NAS) directly. Same results. Not sure what the write speeds are internally, as I don't know of any Linux/Debian disk testing software.
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Sep 30, 2010
When I copy files to my External NTFS HDD using Ubuntu the write speeds are about 10-12 MB/sec, but when I copy files using Windows the write speeds are about 25-30 MB/sec.
Exact same files, tried all three ports on my netbook and even timed it to see if the speeds are by any chance miscalculated by either operating system and Ubuntu is definitely writing at half the speed.
So what could be the problem? When I had Windows on this Netbook I never got had a problem with write speeds so I don't think it is a hardware issue.
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Mar 3, 2010
I have a 4 drive RAID 5 array set up using mdadm. The system is stored on a seperate physical disk outside of the array. When reading from the array its fast but when writing to the array its extremely slow, down to 20MB/Sec compared to 125MB/Sec reading. It does a bit then pauses, then writes a bit more and then pauses again and so on.The test i did was to copy a 5GB file from the RAID to another spare non-raid disk on the system average speed 126MB/s. Copying it back on to the RAID (in another folder) the speed was 20MB/s.The other thing is very slow several KB/s write speed copying from eSATA drive to the RAID.
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Oct 11, 2010
I'm trying to back up my hard drive to a 2 TB WD external so that I can do a clean install of 10.10, however I'm getting tremendously slow write speeds. It hovers around 1.5 MB/s and steadily slows from there. It tells me it will take 150+ hours to transfer 400 GB of data.
I have a AMD quad core processor and 8 gigs of ddr3 ram... USB 2.0... I feel this should go much faster.
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Dec 13, 2010
About NFS.
Server:
Client(s):
Code:
I have followed Robbie Workmans' HowTo [url]
Reading and writing works absolutely fine with small files but large files are tediously slow in writing to the server. (rw,no_subtree_check) are options in exported directories.
What is your experience with NFS and how can I speed up large file/folder transfer(write) speeds?
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Jul 5, 2011
I am hoping someone can help me I setup a brand new ubuntu 11.04 64bit system with:-AMD Phoenom 840 (3.7GHz overclocked) 8GB DDR3 RAM.WD20EARS x 4madmin (RAID5) SetupFor some reason I cannot get the write speed above 15mb/s & I have tried modifying the cache_Stripe_size from 256 to 8192.My read speeds are great burst at 120mb/s & stable at about 60mb/s.The only other possiblility is it could be my HDs which I read causes slow writes not sure if thats true though. point me in the right direction so I can fix this issue as I don't want to move to the dark side (Windows) .
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May 13, 2011
Here is my brief hardware and software detail in my production environment : AMD Phenom X4 3.4gHZ (Over clock to 4gHZ, 8G of Memory, 1TB 7200rpm Harddrive, Running Ubuntu server 10.10.My web production environment were pieced together 3 weeks ago.Here is my dilemma. started out with less that 40 users and now hitting 4,000 unique users per day.Now I am thinking I need faster write to disk and backup of data so I am thinking about putting together a Raid5.
I preparation for this.I have bought a new motherboard, AMD Phenom X4 3.6, and 2 more 2TB 7200rpm (Currently, I have a 2TB 7200rpm not used much)Been digging around this forum for posts with raid setup but still not sure how to seamlessly moving the some 10Gig of data from my current running prod environment once I have RAID5 installed on this new machine via the LIVE Ubuntu Server CD.
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Apr 22, 2010
I'm running ubuntu 9.10, and created a softraid5 with no problems. Now i need it to automount with user read/write access, and i need to make some network share folders. My fstab has the following line for the raid:
Code:
/dev/md0 /media/raid auto rw,user,auto,exec 0 0
After i mounted it, i changed the permission with:
Code:
sudo chmod 777 /media/raid/
So now i can create folders and files on it.
Then i created some shares, one with guest access and other with no guest access.
Now the questions:
1) If i access the guest shared folder via WinXP, i create files and folders, but they appear locked on ubuntu, so i cant access them until i change the permissions. If i go to proprieties/Permissions, the owner is "nobody".
2) What password do i need to use on WinXP, and i try to access the non-guest shared folded? Do i need to create a user just for that?
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Jan 9, 2010
I have no drive failures but just need to recreate a raid5 set as the next free MD disk number. Originally I built a temp OS of debian on a single drive and had 4x2TB drives in a raid5 software array (MD0) this worked fine and allowed me to move all data to it, and remove our old fileserver. I have now pulled out the 4 x 2TB Raid 5 drives and created a new OS on two new 80GB drives, partioned as follows,
MD0 is now 250mb Raid1 as /boot
MD1 is 4GB Raid1 Swap
MD2 is 76GB Raid1 as /
If I turn off and push back in the 4x2TB drives I cannot see a MD3. I presume I would need to create a MD3 from these 4 drives but I dont want to mess things up as its live data. So im here asking for help, or a bit of hand holding to get it done right.
PS - Its a Debian Lenny 5.0.3 Raid1 fresh install replacing a Debian Lenny 5.0.3 on a single disk.
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Jun 30, 2011
I know you can fail and then remove a drive from a RAID5 array. This leaves the array in a degraded state.
How can you remove a drive and convert the array to just a regular, clean array?
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Jan 31, 2011
solve the following problem...mtrr: type mismatch for c0000000,10000000 old: write-back new: write-combiningThis i am getting many lines in DMESG.
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Jan 12, 2010
Ever since I upgraded to 9.10, I've had poor sound quality. There is occasional popping, hissing ans just generally poor sound. I've found several posts about loss of sound but no solution for bad sound quality. Didn't there used to be a way to select your sound in Ubuntu? I remember having a pull down choice of ALSA, Pulse or OSS. I can't find that any more and Pulse seems to be deemed the culprit in other posts I've read. How do I change to ALSA or OSS?
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Nov 17, 2009
Ive installed Gaussian '03 on fedora Core 10, but I'm unable to run it. It aborts and i get the following error
Code:
Erroneous write during file extend. write -1 instead of 4096
Probably out of disk space.
Write error in NtrExt1
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May 7, 2010
problem is that no lower speeds available and ondemand do not work it always stays at 2 GHz even when maxing out all 4 cpu-s with something like Blender render for example?
10.04 on P35-DS3L motherb, CPU Q9300, mem 2GB.
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Feb 17, 2010
I want to write a shell script which will simultaneously collect OS user information and write in an individual text files.Can anyone tell me the syntax of the script.N.B. The user name will be mentioned in an array within the shell script.
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Feb 8, 2010
i'm trying to run ubuntu 8.10 intrepid ibex on an old hand-me-down laptop that i got from a family member, and i've noticed that the performance is actually much worse than it was on windows xp professional (32-bit).
first of all let me give you my specs:
ibm thinkpad r32
intel mobile pentium 4-m 2.0 ghz
ati radeon mobility m6 (i think this is actually the mobility radeon 7000 igp) with 16mb ram
256 mb ram (pc-2100)
i understand that these are very low performance specs, but it feels like the computer is running very sluggishly even for those specs. the computer ran just fine in windows xp, but is extremely sluggish in ubuntu. it seems like it detected all the hardware just fine, but i feel like it may not be utilizing the cpu and/or video to the extent that it should be. a couple of places where it really seems to struggle is when first opening new programs, viewing flash intensive web 2.0 type webpages (i.e. videos), and listening to music/podcasts (with rhythmbox).
it seems like rhythmbox really kills my performance more than anything else, but the performance is poor all around compared to xp, and i feel like that shouldn't be the case. like i said, i understand that the specs are poor, but it feels like it's not even living up to those specs. i know that 8.10 is old and outdated now, but it's what i had laying around and i figured that it might perform better on this old deprecated laptop than 9.10 would anyway. am i wrong in this assumption? would 9.10 perform better for me?
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Jul 30, 2010
my hard drive has 6 partitions, c for windows xp, d for windows 7, e for ubuntu10.04 f is a empty partition which is the origin of my disaster, so, please be patient to hear .i wanna install mac os x in my partition f,so i open the disk management in windows xp, and inadvertently deleted all the logical drives after parition f ,i,e, from partition f to partition h are all deleted due to my stupid mis-operation.
now,each time i power on the computer, it goes to a command line with "grub-rescue>", i had followed the steps provided by other people after google this,but none of them works,the error is either "no such parititon" or "unknown filesystem".
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May 19, 2011
I have an 8Gb mkv file, which I tried to encode to avi using mencoder, it took more than 6hrs and when completed, the quality of the avi was pretty poor.Is there a way to increase the quality or is there a program that can encode mkv files? The mkv will not play on my system without stuttering badly.
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Apr 28, 2011
I have enabled the xhci_hcd module, but my usb 3.0 hard disk is still only being recognised at "480MB/s" connection speeds (with benchmarks confirming it is definitely running at usb 2.0 speeds.
The usb 3 controller is the NEC chip everyone seems to be using. The devices is a Seagate free-agent go (something like that anyway) with the usb 3 adapter.
lsusb takes a good couple of minutes to run, and doesn't mention the NEC controller at all, lspci does list it, and devices plugged into it work, but only at usb 2 speeds as mentioned.
I have a relatively high competency with linux (mostly with fedora over the years) so don't worry about solutions or requests that are quite technical.
Happy to provide machine specs if more detail is required, running Fedora 14 x64 with everything up to date. Specs: [URL]
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Apr 28, 2010
I can't get Gkrellm to show my fan speeds anymore since reinstalling Ubuntu.I have tried 9.10 and 10.04 and tried installing packages to maybe get the drop down to show up for fan speed but still nothing.I have installed Xsensors and that shows fan speeds correctly but I want to show them in Gkrellm like I used to have. Now every other temp gauge is working like it used to but the fan speed monitor.
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Jun 29, 2010
I am using Ubuntu 10.04 and my internet works fine except for my download speeds. In Windows, downloading the same file, it downloads at around 200kb/s but in Ubuntu, it hovers around 20kb/s and never tops 50kb/s. Any idea how I can fix this because I really don't want to go back to Windows but I may have to.
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Jul 15, 2010
I am new to Linux and have recently dropped Windows 7 (and windows all together for that matter) for Ubuntu 10.04.I love the look and feel of Linux and enjoy using it more over Windows. Despite this I am experiencing a serious problem which may cause me to revert back to Windows 7.I have a USB 3G modem: ZTE MF622 on the KKTCELL network.I have got this modem to work with wvdial and Gnome PPP, however i cannot get speeds over 60kb, Windows gives me well over 200kb.
I have tried a number of things but nothing has worked, it seems that no-one has posted a solution to this annoying conundrum.
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Sep 1, 2010
I'm currently downloading some files using wget. According to wget, the download speed is 40-45K/s. But according to the System Monitor, I'm downloading at a rate of 80-100KiB/s. What can explain this contradiction in download speeds? I'm not downloading updates or anything like that: wget, so far as I can tell, is the only downloading.
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Sep 3, 2010
I am running 2 gtx 480 gpu's. I got the fan to overclock on one of them by using "Option" "Coolbits" "5". But adding that to the second device section in xorg.conf doesn't produce any results in nvidia-settings. Would anyone be willing to post their xorg.conf if they have got this working?
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May 3, 2011
Unfortunately my ubuntu installation wakes 31 seconds to get to the boot screen, almost identical to my windows 7 partition. I've already configured grub to my needs, so reducing the counter has already been done, but I have no idea what else to do for my boot speeds when it comes to ubuntu. If anything I can live with these times, but it would be very nice to have it boot at lightning speeds I may even buy a SSD when I get the money.
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May 14, 2011
Recently I upgraded to 11.04 and I noticed the start up speed is much slower than when it was at version 10.
Back when I was running version 10 (10.04 and 10.10) I was running Ubuntu under Windows using wubi and my start up speed was about 9 seconds.
I no longer use Windows and have removed it, and now my boot speed is somewhere between 30 to 45 seconds.
Is this normal for a native Ubuntu installation? Or is 11.04 still buggy?
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Jun 28, 2011
Hey guys, I got a new laptop, so I installed ubuntu 11 on my old laptop. And I have noticed the download speeds have been extremely slow.I have only been getting speeds around 20-60 kbs/sec before I installed ubuntu when it was running windows 7, I was getting around 100-300 kbs/sec. I know its not my internet, because my new laptop runnings windows 7 gets about 250-300.Any suggestions? Its not just in chrome or firefox, its especially slow when downloading packages.
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Apr 4, 2010
First of all I have two Gentoo Linux computers. These computer both have Ethernet ports that support 1000MB/s speeds. Here is the ethtool report for both of the cards.
[code]...
Link detected: yes I have a Cat6 cable connecting the two computers together for direct file backup. Now when I run iperf to check my speeds, I get the following:
[code]...
My question is why is this so slow and how do I get my speeds closer to 1000Mb/s?
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Dec 14, 2010
I tried using my USB to transfer a 500MB file, the speed came up as 1-130 kb/s. That is pathetic. I should be getting more 25MB/s.
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