CentOS 5 Server :: RAID0 - Getting Extremely Slow Read / Write Speed

Jun 28, 2010

I am new to Centos and linux in general. I have just got myself a Dell 1950 server with 2x 1T SATA2 hard disks in it. now the server comes with a PERC5i Raid card with 512Mb. Well I put these in raid 0 and the raid card initilzed the disks to 128 writeback and read ahead. When I loaded centos it did not recognize the dell layout so therefore wanted to initalize it again, so I done this as it wanted. Now I created a 80gb boot and o/s partition and a 100gb swap the rest was created into LVM space to run solus vmwear. But I found the raid 0 to be getting extreamly slow read and write speeds.

Example same disks
Desktop PC max 214mb/s windows vista 64
Server with centos 104mb/s

Now I am not sure but I am told that I need to align the o/s with the raid card settings but I have no idea how to do this. How to do this in plain easy step by step instructions. I mean how to calculate it, how to format the disk this way, and what files to edit where if needed. I have spent hours trying to figure out why my raid 0 is slower than a single disk.

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Ubuntu :: USB Read / Write Speed Unbelievably Slow

Apr 14, 2011

I started a thread in the hardware section, but I've narrowed it down to being a software issue. The problem is that all USB devices are written to at about 1MB/s, and is read at equally slow speeds. After testing my computer on an older Ubuntu release (8.04 32bit), I verified it wasn't a hardware issue, because the read and write speeds were like they were supposed to be. Then, I downloaded the 32bit release of the Ubuntu version I'm currently using (an up-to-date version of Natty) and booted the live cd of it. It was equally slow there as well.

The read/write speeds are equally poor on openSUSE and Arch Linux, so I don't think that it's an issue with Ubuntu, as much as it seems like a kernel issue (or maybe not, you guys can correct me if it seems like it isn't ).

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Server :: Very Slow Raid Performance / Only Write Speed

Jan 5, 2011

I have recently migrated my file server over to a HP Microserver. The server has two 1TB disks, in a software RAID-1 array, using MDADM. When I migrated simply moved the mirrored disks over, from the old server Ubuntu 9.10 (server) to the new one 10.04.1 (server).I Have recently noticed that write speed to the RAID array is *VERY* slow. In the order of 1-2MB/s order of magnitude (more info below). Now obviously this is not optimal performance to say the least. I have checked a few things, CPU utilisation is not abnormal (<5%) nor is memory / swap. When I took a disk out and rebuilt the array, with only one disk (tried both) performance was as to be expected (write speed >~70MB/s) The read speed seems to be unaffected however!

I'm tempted to think that there is something funny going on with the storage subsystem, as copying from the single disk to the array is slower than creating a file from /dev/zero to the array using DD..Either way I can't try the array in another computer right now, so I though I was ask to see if people have seen anything like this!At the moment I'm not sure if it is something strange to do with having simply chucked the mirrored array into the new server, perhaps a different version of MDADM? I'm wondering if it's worth backing up and starting from scratch! Anyhow this has really got me scratching my head, and its a bit of a pain! Any help here would be awesome, e-cookies at the ready! Cheers

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Fedora Networking :: F14 Samba Server With Slow Write Speed

Aug 4, 2011

I had a F14 samba server working flawlessly now for a quite time. Unexpectedly about a month ago the write speed slowed down around 64kbit/s and that's really slow. I haven't changed any configs, only updated the server. I've troubleshooted this from many angles:
-It is not a network issue because sftp writes are good.
-It is not a RAID1 issue because write speed from another directory (locally) are good.
So basically samba is the only thing left.

Here's example from smb.conf:
[MyShare]
comment = My share
path = /mnt/RAID_share
writeable = yes
browseable = yes
writelist = +smbuser

Here's a snip from logs today:
[2011/08/04 09:04:27.509273, 1] smbd/server.c:267(remove_child_pid)
Scheduled cleanup of brl and lock database after unclean shutdown
[2011/08/04 09:04:47.526336, 1] smbd/server.c:240(cleanup_timeout_fn)
Cleaning up brl and lock database after unclean shutdown
[2011/08/04 09:17:57.634660, 1] smbd/server.c:267(remove_child_pid)
Scheduled cleanup of brl and lock database after unclean shutdown
[2011/08/04 09:18:17.635196, 1] smbd/server.c:240(cleanup_timeout_fn)
Cleaning up brl and lock database after unclean shutdown .....

There's a restart that is not software related.

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CentOS 5 Hardware :: Slow Read / Write Operations On 5.5 And ESXi 4.1

May 22, 2011

I have a problem with speed of read/write operations (3Mb/s max)

Hardware - HP DL160.
CentOS 5.5 working on VMWare ESXi4.1.
R/W operations on CentOS 5.5 without ESXi - 60Mb/s

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Hardware :: Server - Buffered Disk Read Speed Just 3.98MB/s Very Slow ?

Jul 12, 2010

I am having a problem with my CentOS based server where the hard drive speeds are incredibly slow for both of the hard drives installed -

Code:

Timing cached reads: 16512 MB in 2.00 seconds = 8272.92 MB/sec

Timing buffered disk reads: 12 MB in 3.01 seconds = 3.98 MB/sec

I have looked around but do not understand the complexities of rebuilding kernel etc so would need some assistance. I have checked IO_support and it is set to 0

Code:

Here are the results for hardware installed after a quick lspci -v

Code:

If there are any noticeable incompatibilities here and how I could work to speed this up. I only have SSH access and could possibly get a KVM on it as it is currently locked up in a DataCenter.

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Sep 4, 2010

My problem is extremely slow write on hard disk and 100% cpu usage and it happens when I want to write something on the hard derive not any other external derive.

Tried a fresh ubuntu install. No change. I am not even sure if it is a software or hardware problem.

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Debian :: Sata Disk Write Speed Is Very Slow ?

Sep 14, 2010

I got a new machine with GA-p55A-ud3 mobo and a WDC WD10EARS 1T disk.

When I tried to benchmark the disk IO, I was suprised by the low write speed:

The related output from my lspci:

The related output from my lshw:

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Mar 4, 2009

SSH access works fine from a LAN computer, but anything over the internet is extremely slow or times out. We're talking a good 1-2 minutes just to get the login prompt!This is a new installation, I switched from Fedora to CentOS. Previously, SSH from off-network worked perfectly fine with Fedora.What could it be? All other network services on this machine are working properly and at normal speeds, it's just SSH that is not willing to cooperate.

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Debian Configuration :: Sata Disk Write Speed Is Very Slow

Sep 14, 2010

I got a new machine with GA-p55A-ud3 mobo and a WDC WD10EARS 1T disk. When I tried to benchmark the disk IO, I was suprised by the low write speed:

[Children see throughput for 1 initial writers = 35962.63 KB/sec
Parent sees throughput for 1 initial writers = 35962.63 KB/sec
Min throughput per process = 35962.63 KB/sec

[code].....

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Ubuntu Networking :: Mdadmin RAID5 Very Slow Write Speed?

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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Jul 6, 2010

I just tried NFS for the first time after reading that it's considerably faster than SSHFS, which I currently use, but I'm experiencing slow write speeds and problems while copying files in nautilus.

[Code]...

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Apr 23, 2011

I Have Configure Samba server in Centos, I need give permission like for some user(5User) can able to read and write the particular folder, and again i need give some another user(6user) can only read permission for same folder.

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Aug 31, 2010

We have an environment where couple of webservers are being active behind the loadbalancer, the webpage is getting loaded extremely slow if we restart the apache on those boxes its responding very fine. So currently we are restarting the apache service daily basis, i have attached the config with this thread could anyone suggest how to fine tune apache so it works fine without restarting it daily?

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Debian :: Slow Read/write On External Storage Devices Connected Via USB

Mar 29, 2010

I am running Lenny. USB storage devices are painfully slow, if the data to be copied is above 4GB it works on transferring for more than half an hour and then comes up with an error dialog(saying something like file size is too big). The problem exists in both read and write.

I did google a bit and here is the output of lsmod | grep hci
ehci_hcd28428 0
uhci_hcd18672 0
usbcore118192 4 usb_storage,ehci_hcd,uhci_hcd

[Code].....

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Server :: Debian Quadcore With 150 Mount.cifs Going Extremely Slow On Commands

Jul 9, 2010

I've mounted a kind of proxy to map some cifs folders, 150 aprox. It umounts and mounts everything each hour, to check on changes on a configfile managed by a secretary, she just edits a file with names and I prepared a cron to notice the new mountpoints. It's a debian, no desktop , no nothing else. Just mount.cifs and apache2 to let the master webpage access to some files on each user samba home. The server has 4 cores and 2Gb of RAM. It's brand new, but it goes very slow.

[Code]....

Does anyone have an idea why is that working so slow? The apache is working well, it's the shell which is working extremelly slow.

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Server :: Logins Via SSH To Server Are Extremely Slow

Jun 13, 2010

Running RHEL 5.5 x64 with the latest updates. Running Oracle 11gR2. Server has 8gb ram 2xcpu 2.4 xeon.Only running one fresh instance of Oracle, no applications are even pointed at the DB.Two Issues...

1. Logins via SSH to server are extremely slow, about 30 seconds after typing password
2. Once I am logged in, launching sqlplus is very slow. After typing password, sqlplus hangs for 15 or so seconds.

Even when I am actually at the console, login of course is instantaneous.. but sqlplus still has the same issue. CPU is at 0% no swap is being used. Shouldn't be a network issue, on the same network.

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CentOS 5 Server :: RAID0+1 Or Other Setup For 4 Drives?

Mar 30, 2011

I tore down my old ftp server running FreeNAS because it had some issues. I decided to add a couple more drives and install CentOS on it instead. So now I have 4x 2TB drives that I set up yesterday.OS is installed on a usb flash drive exclusively while I chose to set up the 2TB drives in two stripes and then mirrored, for RAID0+1 instead of RAID1+0.

/dev/md0 = drive 1+2 in RAID0
/dev/md1 = drive 3+4 in RAID0
/dev/md2 = md0+md1 in RAID1

Well, the sync time for these two mirrors of blank drives is almost done, having taken some 15+ hours.I chose this setup to have a single 3.6TB file system mirrored to another 3.6TB for "backup". As this is only going to be a headless ftp server, I don't need massive redundancy/backup. A mirror should suffice if I need to pull some files.So now I'm second guessing myself. I'm wondering if it is even worth it to stripe 2 drives into a single volume with such large sync times. Since data xfer will be over internet, I don't require the massive file writing capacity that would be preferable if it were in my home as a NAS. So, the "performance" increase of RAID0 is not strictly mandatory.

I'm wondering if I should just wipe the drives and set them up in JBOD or LVM instead of RAID0 arrays.In case of boot drive failure, I'd be booting a livecd to xfer files elsewhere or recover the boot drive. So, what difference would I see if I were livebooting to md0, md1, md2 for data viewing as opposed to livebooting to an LVM or JBOD array?As an aside, the drives are WD20EARS, which are 4k sectors which I aligned to start at sector 2048 in fdisk.

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CentOS 5 :: Switching To 64bit On Sempron LE1100 - Slow Transfer Speed

Aug 15, 2010

My Sempron LE-1100 home server (1GB RAM) has run CentOS 5 32-bit happily for years, but I decided to replace its two Seagate 250GB drives (RAID1) with two WD 500GB black drives (RAID1). I decided to do a fresh install and used CentOS 5.5 64-bit this time. Since switching to the 64-bit OS with the new drives, my transfer speed across the LAN has dropped from a reliable 45MB/s to only 18MB/s from other machines to the server, and to 27MB/s from the server to other machines on the LAN. I use gFTP or WinSCP for these transfers (in FTP mode). Prior to installing the new WD drives, I ran the long WD tests on them and they passed, so I don't believe the drives are faulty. I suspect it's more to do with me switching CentOS from i386 to x86_64.

I've got two questions:
1. Is the 64-bit version of CentOS appropriate for a Sempron LE-1100 with 1GB ram, or should I switch back to the i386 version?
2. Is there a reason why switching to the 64-bit OS would negatively impact on transfer speeds? I doubt the new HDDs are faulty...I was expecting them to be faster.
3. Is there anything I can try to improve transfer speeds across the LAN?
According to PHPSysInfo, the network card is "Ethernet controller: nVidia Corporation MCP67 Ethernet".

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Aug 22, 2010

I installed CentOS 5.5 32-bit with Gnome and want to use it as a file server. The volume I wish to share is a 1.5TB NTFS partition stored on a USB drive. I installed "ntfsprogs" and "fuse-ntfs-3g" to get NTFS support. However, I only have read access to the volume.

How can I fix this and get Read+Write to the NTFS drive?

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Apr 6, 2010

After installing the "fuse" and "fuse-ntfs-3g" packages, my ntfs formatted thumb drive mounts read only, as follows:# mount.../dev/sdb1 on /media/disk type fuseblk (rw,noexec,nosuid,nodev,allow_other,default_permissions,blksize=4096)

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Jan 13, 2010

I have just formated and did a fresh install to start all over. I installed Ubuntu 9.1 and everything went fine but the network. The computer serve as a NAS and MediaPlayer. When getting a file from the server, I get a speed of 40-60mb/sec, which are good for a Gigabit network. When I try to put a file in, the speed can't pass more than 1mb/sec and often stop.

Here's the network info:

Code:

vric@XBMC:~$ ifconfig
eth0 Link encap:Ethernet HWaddr 00:24:8c:a1:eb:55
inet addr:192.168.1.5 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::224:8cff:fea1:eb55/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1

[code]...

Edit: Looks like it's a Gigabit Problem. I connected the Ubuntu box to my Linksys router which is 10/100 and everything is MUCH faster.

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Jul 20, 2009

I am trying to install the reiserfs drivers to read/write to my external drive. But keep getting command not found. Although the system can get man pages for modprobe.

modprobe reiserfs
bash: modprobe: command not found

I also need to know how to add myself to the sudoers file. I have already tried visudo but this has not worked.

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Mar 6, 2010

I have set up a file server (Ubuntu Server Edition) for our lab. People can connect to common Samba file shares from their personal laptops/desktops, which run either Windows Vista or Mac OSX. The guys with OSX have upload/download speeds of ~2 MB/s, while the Vista machines are slogging away at ~200kb/s for downloads and ~400kb/s for uploads. In both cases, the connection are through wired ethernet ports which should function identically. Since the Macs work fine on the same network, I assume this is a Vista issue.

I have tried troubleshooting one of the Vista machines by:
1. Turning off the Remove Differential Compression feature
2. Disabling autotuning following these instructions
3. Adding a registry key following the same link above.

But nothing has improved. Anybody have any advice on addition tweaks to the Vista machine? Is there a chance that this is actually a server-side/samba issue?

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Mar 21, 2011

I have a set of Mac software RAID 0 drives that my friend gave me for spring break. I need to access a file on the drive in the Extra folder on one of the drives. It contains some startup settings that need to be changed before I can boot it properly. I loaded up ubuntu and tried to access the drive but only the top level files are readable and when I try to access the Extra folder it says "permission denied." The info on the folder permissions tab is User ID: 501 and Group ID: dialout. Owner permissions = r/w, all other groups/users = none. How can I make Ubuntu read/write to this Extra folder?

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Sep 10, 2009

I have an HP GL380 with an MSA20 connected for storage space, we use it as an nas unit. The system is SLES 10. We use both NFS and SMB for file sharing, no special users and so. We are 8-10 users of the machine. We store both large and small files such at thumbnails and disk images.

Now, my problem. I�d like to give more priority for reading files on the server, so a user can look at pictures without problem, and if another user is writing an image file of an disk (10-1000 GB) this writing process should get less priority. The most important is always reading files, to get the job done.

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Feb 24, 2010

When i try to copy files from my samba server (Ubuntu 9.10) to my windows seven media center, the speed is extremely slow. So slow that is better to download 100mb file from the internet, than from my lan. And on my lan, every card and switch is at 1000 mbps speeds on cat5 cables. And from XP or other linux machine

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Aug 21, 2010

I would like to set up three directories-

1) RW public directory
2) R-public, RW-me
3) Private dir (my /home/me)

BTW, I set all file permissions (recursively) to 777 until I can get this to work...

1) So far I have got 1 samba share working Read only with the following: [Music]

[Code]...

Guests can read it okay but user 'JoeBleaux' can't write to it...

2) I can't get the public read-write dir to work, again, it can be read by everyone but no one can write to it. Here's my broken config for this share: [Uploads]

[Code]...

3) I can't get the private dir to work. Here's my broken config for this share: [HomeDir]

[Code]...

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Jan 27, 2010

I run F12. Since some days my laptop has become very sluggish. In Mozilla, switching between the tabs takes like seconds instead of fraction of a second. Also minimizing and mximizing windows takes long. Switching between the windows too takes long. Now I can't see the cursor while typing this post. I disabled some services that start at the boot time. I'm posting a list of services that are on in the runlevel 5 as that's the one I use.

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May 1, 2010

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