I have two 1TB drives I want to span for the storage area of mythtv. Not for swap, system or anything else, just storage of myth's files.
My mythserver died and I'm rebuilding from scratch, in a previous life I'd used mdadm and a software raid 0. But this was always a bit of a pita and I'm told it's not necssary. What's the most efficient method of using two drives and could someone point me towards a how to on the subject?
So, at the moment I have a 7TB LVM with 1 group and one logical volume. In all honesty I don't back up this information. It is filled with data that I can "afford" to lose, but... would rather not. How do LVMs fail? If I lose a 1.5TB drive that is part of the LVM does that mean at most I could lose 1.5TB of data? Or can files span more than one drive? if so, would it just be one file what would span two drives? or could there be many files that span multiple drives drives? Essentially. I'm just curious, in a general, in a high level sense about LVM safety. What are the risks that are involved?
Edit: what happens if I boot up the computer with a drive missing from the lvm? Is there a first primary drive?
I'm trying to work with a project manager and some hardware guys and all of us are trying to get a grasp on the UEC.
1. Can a VM span multiple nodes?
2. If a website scales beyond 100% CPU on a node, does it automatically spill over to another node and start using processing power there?
3. Do I have to rewrite the code of my web app (such as WordPress) so that it works in a private cloud?
4. Does KVM support virtual memory such that when I run out of RAM it uses paging?
5. How is UEC any different than me bringing up several servers with several VMs inside, and then moving VMs around as I need? Is it really a cloud where the VMs exist in a cloud, not necessarily a node?
6. If I power off a node while it's hot, how can I assure myself that the data will be okay?
7. Do I want to use SCSI attached RAID, or NAS, or NFS? We're simply trying to host thousands of blogs and LAMP sites in a way that we can handle spike loads.
8. Do I attach the disk volumes to the cluster controller and then run a command such that the nodes can mount those virtual volumes?
9. Do I need to run another command on the VMs to mount volumes that the nodes can see?
10. What is the role of the storage controller and how is it separate from the cluster controller?
11. How many systems, minimum, do we need to get this tested out?
12. For testing purposes, can I install UEC on an Intel P4 server and then a node on Intel P3 server -- even with some limitations?
13. Let's imagine I have 5 node servers, and one catches fire and is a total loss. Can I get those VMs back and get that data back? What would have to be the proper config to make that happen?
I have a box currently setup to share files on my network and for the most part its great. However when multiple people request files my 1gb speeds drop. I have extra 1gb NIC's to use but have no clue on how to spread the load of transfering files between multiple nics. Is this even possible? or does this happen automagically?
View 2 Replies View RelatedCan I somehow span the gnome panel to my other monitor, or to add a new gnome-panel to my second monitor?
View 1 Replies View RelatedHow can I make a window span over both monitors? I have the monitors configured using the KDE monitor setting tool. I need specifically full-screen (for presentation purposes) or at least a maximized window. Kwin insists on locking the window on one desktop.interestingly it really is Kwin preventing me to do this. If I get rid of KDE and just launch a plain X session, the window maximizes correctly.
View 1 Replies View RelatedI recently read about recommendations for increasing the life span of optical media as follows:-
1) storage at constant temperature in the range 41F-68F with relative humidity 30%-50%
2) no exposure to direct sunlight
3) marking only with water soluble markers
How water soluble marker becomes a factor in the life span of an optical media ?
Based on much internet searching, I've found that I was/am not the only one struggling to get Fedora 10 to span the display across a laptop screen and an external monitor. So what I have here are instructions to do so:
1) Fedora 10 does not (by default) use an xorg.conf file to configure the display. So type the following command into the command line: yum install system-config-display
2) Go to the menu bar and navigate to System>Administration>Display. I left all the display settings as they were and hit OK (repeat this step twice to make an xorg.conf backup). This will generate the xorg.conf and back up files in the directory: /etc/X11/
3) Now we need to see what size virtual screen you need. Type the following command into the command line (without the quotes): "xrandr --output VGA --auto --right-of LVDS" It will tell you that you are asking for a certain size screen. Write those numbers down. I have a 1600x1200 external monitor so my number is 2624x1200 (1600+1024 x 1200).
4) Change directories to /etc/X11 and type (without the quotes): "sudo gedit xorg.conf" Scroll down to where the device section is. Mine looks like this:
Section "Device"
Identifier "Videocard0"
Driver "intel"
EndSection
Some videocards need to turn 3d acceleration off in order for dual screens to work. It is important that you turn off desktop effects if you turn off 3d acceleration!!! So under the driver line add the line (with quotes): Option "NoAccel" "true" Mine looks like this:
[Code]....
Scroll down to where the screen section is, and then find the display subsection. It should look something like this:
[Code]....
I am having a Dell ST2410 LCD and a laptop IBM.I want to span my desktop so that some portion is on laptop and some on external monitor. I tried xdmx but it did not worked.
View 6 Replies View RelatedI am making online Myproject using java in which you can make your porject online or with your team, my problem is that when i drag one component from one page it disappear from another frame & i am unable to solve the problem that if the user don't have install java than myproject in not useable i am giving a span sort of code of my project:
[code]...
I upgraded to FC10 from FC8 and my Gnome-panel no longer spans both screens in my dual monitor configuration. This worked fine in FC8, and I can't seem to figure out how to make this config work in FC10.
I've tried Xinerama and Twinview, and various configurations in xorg.conf, and cannot seem to make it happen.
How to make both my panels (top and bottom) go across both screens?
upgraded from karmic through update managerANDnone of of my external drives cd drive or flash drives are picked upad to go back to karmic and will remain there for a whil
View 9 Replies View RelatedI'm breaking into the OS drive side with RAID-1 now. I have my server set up with a pair of 80 GB drives, mirrored (RAID-1) and have been testing the fail-over and rebuild process. Works great physically failing out either drive. Great! My next quest is setting up a backup procedure for the OS drives, and I want to know how others are doing this.
Here's what I was thinking, and I'd love some feedback: Fail one of the disks out of the RAID-1, then image it to a file, saved on an external disk, using the dd command (if memory serves, it would be something like "sudo dd if=/dev/sda of=backupfilename.img") Then, re-add the failed disk back into the array. In the event I needed to roll back to one of those snapshots, I would just use the "dd" command to dump the image back on to an appropriate hard disk, boot to it, and rebuild the RAID-1 from that.
Does that sound like a good practice, or is there a better way? A couple notes: I do not have the luxury of a stack of extra disks, so I cannot just do the standard mirror breaks and keep the disks on-hand, and using something like a tape drive is also not an option.
I recently had issues with the latest version of the Linux Kernels and I got that fixed but ever since that has happened none of my Drives will mount and they aren't even recognized.
View 1 Replies View Relatedi have recently setup and installed Ubuntu 9.04 on a virtulal drive usingVMWare 6.04, installed the desktop gui as well, I need to add other drives for data and loggng, which I did in the VMWare side. I can see the 2 drives in ubuntu, but can not access them, I get he unable to mount location when I try. How can resolve this please as I need these to virtual drives to be used as data drives.
View 1 Replies View RelatedI've used it once before but got fed up with the boot asking me everytime I turned my laptop on because I wasn't using it enough. I have Windows 7 on drive C . I want to keep it on drive C. I have several 1.5TB+ drives, and one of them is not being used. I want to dedicate it to Ubuntu, and be able to do a dual boot with my Windows 7 install. Is this possible? If it is, what about when this drive is not connected to my laptop? Will that mess up the boot process?
View 2 Replies View Relatedso I setup a raid ten system and I was wondering what that difference between the active and spare drives is ? if I have 4 active drives then 2 the two stripes are then mirrored right?
root@wolfden:~# cat /proc/mdstat
Personalities : [raid0] [raid10]
md1 : active raid10 sda2[0] sdd2[3] sdc2[2] sdb2[1]
[code]....
I am building a home server that will host a multitude of files; from mp3s to ebooks to FEA software and files. I don't know if RAID is the right thing for me. This server will have all the files that I have accumulated over the years and if the drive fails than I will be S.O.L. I have seen discussions where someone has RAID 1 setup but they don't have their drives internally (to the case), they bought 2 separate external hard drives with eSata to minimize an electrical failure to the drives. (I guess this is a good idea)I have also read about having one drive then using a second to rsync data every week. I planned on purchasing 2 enterprise hard drives of 500 MB to 1 GB but I don't have any experience with how I should handle my data
View 10 Replies View RelatedI suspect this is not new but I just can't find where it was treated. Maybe someone can give me a good lead.I just want to prevent certain users from accessing CD/DVD drives and all external drives. They should be able to mount their home directories and move around within the OS but they shouldn't be able to move data away from the PC. Any Clues?
View 2 Replies View RelatedI have Fedora 14 installed on my main internal drive. I have one Fedora 14 and one Fedora 15 installed on two separate USB drives.When I boot into any of these drives, I can't access any of the other hard drives from the other drivesll I can, but just the boot partitions.Is there any way of mounting the other partitions so I can access the information?---------- Post added at 12:42 PM ---------- Previous post was at 09:34 AM ----------I guess even an explanation on why I can't view them would be good too.
View 7 Replies View RelatedI have an email server that I think is about to have a hard drive fail. It is running an old install of Redhat 9.0 I think. It has 2 120gb hard drives mirrored as a raid1. I want to copy those to a new pair of 500gb hard drives again as the same disk raid1 mirror. What tool would work for this? DD or partimage? Would it all be exactly the same and boot up still?
View 3 Replies View Relatedi have cretaed RAID on one of my server RAID health is ok but its shows warning. so what could be the problem. WARNING: 0:0:RAID-1:2 drives:153GB:Optimal Drives:2 (11528 Errors)
View 1 Replies View RelatedI have a Centos 5.5 system with 2* 250 gig sata physical drives, sda and sdb. Each drive has a linux raid boot partition and a Linux raid LVM partition. Both pairs of partitions are set up with raid 1 mirroring. I want to add more data capacity - and I propose to add a second pair of physical drives - this time 1.5 terabyte drives presumably sdc and sdd. I assume I can just plug in the new hardware - reboot the system and set up the new partitions, raid arrays and LVMs on the live system. My first question:
1) Is there any danger - that adding these drives to arbitrary sata ports on the motherboard will cause the re-enumeration of the "sdx" series in such a way that the system will get confused about where to find the existing raid components and/or the boot or root file-systems? If anyone can point me to a tutorial on how the enumeration of the "sdx" sequence works and how the system finds the raid arrays and root file-system at boot time
2) I intend to use the majority of the new raid array as an LVM "Data Volume" to isolate "data" from "system" files for backup and maintenance purposes. Is there any merit in creating "alternate" boot partitions and "alternate" root file-systems on the new drives so that the system can be backed up there periodically? The intent here is to boot from the newer partition in the event of a corruption or other failure of the current boot or root file-system. If this is a good idea - how would the system know where to find the root file-system if the original one gets corrupted. i.e. At boot time - how does the system know what root file-system to use and where to find it?
3) If I create new LVM /raid partitions on the new drives - should the new LVM be part of the same "volgroup" - or would it be better to make it a separate "volgroup"? What are the issues to consider in making that decision?
Running Ubuntu 10.04, works fine but does not recognise any drives connected via USB. Does if Ubuntu is run from live CD.
I looked through the forum and have found this problem aired but not seen any tangible answers; my apologies if I have missed some which gave a fix. Don't need to run scripts in terminal and tread water. There must be an answer. If an old lady needed to use an USB drive after she had loaded Ubuntu and had this problem I'm sure she would just need to tick a couple of boxes, and yes, I have had a look at Ubuntu Tweak.
This problem is on my laptop and Desktop PC; have looked at the format area and have tried an USB type drive from a colleague; same result.
is there a way to lock cd/dvd rom drives in ubuntu. Also if there is a way to lock usb ports so no one can use pendrives, etc.
View 1 Replies View RelatedI've been Ubuntu 8.10 along with Windows from abt 3-4 monthsFor automatically mounting of NTFS drives that I has which were created by WIndows, I uses NTFS Configuration tool Everything was working fine in both OS's.But how come of a sudden today I'm not able to open any drive that I have which were happening till now.Not only this,at least if we press F9 then we get sidebar,from where we could have opened the drive .even that is not happening.
View 4 Replies View RelatedSuffice it to say, I'm an idjit and can't figure out how to get my USB drives to automount.
View 9 Replies View RelatedI have question, where can I see the drives that I partition when installing ubuntu?
just like in Windows if you go in MY COMPUTER you can see LOCAL DISK C and LOCAL DISK D?
please help me
i tryed this [URL]
now i cant reconfigure the drives. the first and 3rd thumbnail appears from that tutorial..
miss the 2nd thumbnail
and cant unmount a any drive
itryed uninstall the software and reinstall it. nothing happens every time i boot all drives mounted automaticaly
This is yet another "I can't see my new disk" thread - sorry, I've had a good look at others and have tried the obvious but I'm stuck. I have a working Ubuntu 9.04 installation - 3 SATA drives, in a home made box on an Intel DG965WH mobo. It's been working well for a long time (which is why I've not felt the need to upgrade the OS) but I'm running out of disc space so I've just bought 2 new 2TB drives (Seagate ST2000DL003).
The board supports up to 6 drives - in fact in previous configs I have had 6 running before.
Now, however:
- the BIOS is seeing the new discs (so they are connected and powered)
- new block devices /dev/sdd and /dev/sde are being created, but I can't use them...
- gparted lists just the three old drives, not the two new ones, in its menus
- sudo fdisk /dev/sdd returns "Unable to read /dev/sdd"
I've tried disconnecting one of the drives - /dev/sde goes away as you'd expect but /dev/sdd still won't work In the BIOS, I have tried different settings - "Legacy" and "Native", makes no difference As far as I can see, 2TB shouldn't be too big to worry the OS.