General :: New Disks (RAID1) Not Enough Space?

Jan 13, 2011

I recently followed this guide to create a RAID1 [URL]... First I partitioned the disks with fdisk. I made the RAID array with

mdadm --create /dev/md0 --level=1 --raid-devices=2 /dev/sdb1 /dev/sdc1. Then I created the filesystem with mkfs.ext3 /dev/md0.

I then mounted md0 at /Video with mount /dev/md0 /Video/ All according to the guide.. Today I made a samba-share out of /Video/Rorschach to easily put files in there from my windows7-machine (the plan is to steam from my CentOS-server to my HTPC which hasn't arrived yet). I started to put movies in there. It went just fine for a while but then I got this message: [URL]... How is that even possible when df -h looks like this?:

[code]...

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CentOS 5 :: New Disks (RAID1), Not Enough Space?

Jan 13, 2011

I recently followed this guide to create a RAID1 [URL]First I partitioned the disks with fdiskI made the RAID array with

mdadm --create /dev/md0 --level=1 --raid-devices=2 /dev/sdb1 /dev/sdc1

Then I created the filesystem with

mkfs.ext3 /dev/md0

I then mounted md0 at /Video with

mount /dev/md0 /Video/

Today I made a samba-share out of /Video/Rorschach to easily put files in there from my windows7-machine (the plan is to steam from my CentOS-server to my HTPC which hasn't arrived yet).I started to put movies in there. It went just fine for a while but then I got this message:

[URL]

How is that even possible when df -h looks like this?:

[root@Rorschach Rorschach]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol00
446G 70G 354G 17% /

[code]...

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General :: Commercial NAS RAID1 Disks Moved To Software Raid System?

Feb 14, 2011

I've got a couple of commercial NAS boxes and I'm wondering if they (ReadyNas duo, DLink DNS-323) or any other NAS is suitable for having their RAIDed disks moved to a software-based NAS. To be specific, I'm a big fan of the (largely) Debian-based Ubuntu. Can the aforementioned NAS drives be migrated to Ubuntu (e.g. using the mdadm Linux command)?

Secondly, is there any commercial NAS that can be migrated over? Incidentally, here is a link to somebody who succeeded in a migration:URL...My specific scenario I'd like to prepare for, is the eventual (sudden) death of one of the NAS motherboards.

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OpenSUSE Install :: 11.3 Installation With RAID1 On Two Disks?

Dec 14, 2010

I fail to install OpenSuse 11.3 with Raid-1. What I do: Partitioning -> Expert. sda1 type RAID do not format / mount, sda2 /(root) type RAID do not format / mount, sda3 /home type RAID do not format/mount. Clone disk to sdb. Raid -> add md126p1 type swap mount to swap, add->md126p2 type etx4 mount to /(root), md126p3 type ext4 mount to /home. Bootloader: GRUB, boot from MBR enabled, boot from / disabled. After installation the system does not boot and grub reports error that the specified filesystem can not be found.

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Ubuntu Installation :: Anyway To Re-partition Disks To Use RAID1

Aug 1, 2011

I just installed Ubuntu server edition to my computer (brand new, no OS) and finished installation. In the terminal I used apt-get ubuntu-desktop to install a desktop interface.In my rig, I have two 500GB HDDs. I set them up through my computer BIOS as RAID1 drives, yet as I understand I still need to configure the Ubuntu software raid for it to work correctly. Unfortunately, I already partitioned my drives! I used the easy way (guided with LVM or whatever) and let it do it for me. Now, RAID1 is very important to me! Is there anyway to repartition the disks to use RAID1, or do I need to wipe my computer and reinstall Ubuntu?

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Hardware :: Determine The UUID Of 2 Disks That Are Assembled In A RAID1 Array?

Feb 17, 2011

I just experienced a HDD failure and while reorganizing the drives inthis machine I realized the benefits of UUID instead of /dev/sdX nomenclature. I am trying to determine the UUID of 2 disks that are assembled in a RAID1 array. right now they are /dev/sde & /dev/sdf with each only one partition. I tried ls -l /dev/disk/by-uuid but I get only the UUID of other disks, not the ones currently ID'd as sde & sdf. my mdadm.conf assembles several raid arrays all by UUID, but somehow, I cant recall how I got the UUIDs of the other HDDs at first...

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Fedora Installation :: Error - There Isn't Enough Free Space On The Disks To Create The Layout

Aug 14, 2009

I got a new computer (core i7, 6gb ram, 500gb hdd).I first installed Windows 7, because I remembered how Fedora 9 created a dual-boot screen nicely, while if I installed XP on a system with Fedora 9 it would just take over the boot and boot to XP.Anyway, so Windows 7 is installed, and I got the Fedora 11 DVD install.I partitioned the hdd as thus (on win7 installation): 93gb windows system, 300gb media partition, 90gb unformatted.When I boot the installation and select the "use free space" I get an error that there isn't enough free space on the disks to create the layout.I also tried to create a custom layout, but after a few errors I gave up on that what should I do to get Fedora 11 installed?

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Fedora Hardware :: Save Data On Bluray Disks Of 25 Gb ( Better Than Dvds, More Space )?

May 18, 2011

I want to buy another laptop. I want to use FC on it. I need bluray because I want to save data on bluray disks of 25 gb (better than dvds, more space). I have one option, a fujitsu that has bluray writer, big display (I have another one, other model, same size and it's working fine with Fc14, only some small issues).

Second option is a Dell (I had an older dell inspiron before, which worked fine with FC), more expensive, lacking a writer, but it can read bluray. If I take this, I would have to also buy an external bluray writer. Has nice specs, but I am really worried about the graphic card, whether I can make it work with Fc14. I saw some people having problems with linux and this graphic card, while searching on google.

Here's specs for both (sorry for the language from website, but I found in English other specs than these, I guess the specs can be read easily): Dell XPS L702x and FUJITSU Lifebook NH570 I am inclining more towards the Fujitsu, but haven't decided yet.

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Fedora Installation :: Error: Could Not Allocate Requested Partitions - Not Enough Free Space On Disks

Jul 11, 2010

I'm trying to install Fedora 13 on my HP dv6 laptop and when I try to use the Use Free Space installation type, I receive a Partitioning Error: Could not allocate requested partitions - not enough free space on disks. Before I started the install, I used the Disk Management utility in Windows 7 to shrink the volume of the C: drive down to 242 GB and leaving 210 GB Unallocated. Here is what the screen looks like when I select Create Custom Layout (also receive the not enough free space error):

Device (sda) Size Type
sda1 199 ntfs
sda2 248,018 ntfs
Free 215,175
sda3 13,443 ntfs
sda4 103 vfat

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Fedora Installation :: Could Not Allocate Requested Partitions: Not Enough Free Space On Disks Dell1545 Win7

Apr 8, 2010

I have Dell Laptop 1545 which already installed windows 7 home premium which is also having two partitions one is reserved by the oem and another is for recovery partition and another 200gb i am using for windows 7 now i have left only 80gb hard disk. So I started to install the Fedora 12 in my laptop every thing is going fine but

at the time of creating the partitions iam unable to allocate the partitions the left 80gb i tried to select and tried for custom partition but to my surprise it is giving the following message "Could not allocate requested partitions: not enough free space on disks"

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General :: Division Of Logical Memory Space In To User Space And Kernel Space

Jan 4, 2010

Logical Memory Space of 4GB is divided in to 3GB User Space and 1GB Kernel Space. Always. Correct?

1. How can we change it? (just changing value of PAGE_OFFSET is okay?)

2. If system have only 256MB of memory (embedded system) and suppose Kernel Modules eat away all the memory during boot. User space will be left will no memory. Is this case possible?

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Ubuntu Installation :: 10.10 - No Disks At "Allocate Drive Space"

Jan 29, 2011

I'm a Linux newbie but familiar with computers in general. I can install 9.4 64 bit (but no network to update from), but 10.4 and 10.10 both fail -- I cannot get the Allocate drive space screen to list the available drives. Just a blank panel. The drive is listed in the Boot loader panel. The LiveCD works. Disk utility and Gparted are both available. At one point I even managed to mount the 9.4 file system on the LiveCD, I think using "sudo mount"

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Fedora Installation :: 16 Gb Enough For F11 - Error "Couldn't Allocate Requested Partitions: Not Enough Free Space On Disks"

Oct 24, 2009

Created abt 16.4 gb free space using Disk Management in vista. I read the sticky on installing from the live cd and did accordingly. Whatever Partition i create first (boot or /), it gets done. However, when tryin to create the 2nd partition, i get "Could not allocate requested partitions:Not enough free space on disks." Cant proceed any further.

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Debian Hardware :: Servers Which Contain SATA Disks And SAS Disks?

Feb 25, 2010

I have servers which contain SATA disks and SAS disks. I was testing the speed of writing on these servers and I recognized that SAS 10.000 disks much more slowly than the SATA 7200. What do you think about this slowness? What are the reasons of this slowness?

I am giving the below rates (values) which I took from my test (from my comparisons between SAS 10.000 and SATA 7200);

dd if=/dev/zero of=bigfile.txt bs=1024 count=1000000 when this comment was run in SAS disk server, I took this output(10.000 rpm)

(a new server,2 CPU 8 core and 8 gb ram)

1000000+0 records in
1000000+0 records out
1024000000 bytes (1.0 GB) copied, 12.9662 s, 79.0 MB/s (I have not used this server yet) (hw raid1)

[Code].....

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Ubuntu Installation :: Which Disks Can Be Main Boot Disks

Mar 31, 2010

I have/had a PC with several hard drives, and a mix of ubuntu and windows on multi boot.The old boot drive died screaming, and I need to start again. (But my data is safe! yay!)

Is there anything special about which drive can be the main drive to start booting from? Or to put it another way, can I install to any of the other 3 and expect it to work, or do I need to switch them around so a different drive is on the connections for the recently dead one?

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General :: Calling User Space Callback Function From Kernel Space?

Sep 22, 2009

I am writing device driver in which i have to call callback function from kernel space, which are saving my data. But the callback functions are in userspace. While accessing them i am getting segmentation fault.

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General :: Scripting - Cp A List Of Files Which Starts With - Or Space Without - Or Space?

Oct 14, 2009

I have a list of files in a directory which starts with - or have space.

I need to copy them back without the space or -?

linux1[sim]% ls linux1[sim]% cp ./-* ./*

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General :: Virtual Space Seen By Each New Process In User Space?

Jun 21, 2010

In a 32-bit system, max memory addressable is 4GB. Now Linux kernel does memory mapping division of 1GB for kernel address space and 3GB for user address space. That means 4GB of virtual address space is divided between kernel (1GB) and user (3GB).

Q1. All virtual mapping utilizes the available physical RAM without any division? I mean to say that if RAM is 512MB then a page in kernel space can lie any where RAM (leave aside old PCI dma accesses)? (How this fits to fact that kernel memory is non-pageble)

Q2. If a process is created in user space, it has visibility 4GB address space or 3GB address space?

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General :: Use Free Space To Extend The Space Of A Drive?

Jul 5, 2011

My system is dual boot with win7 and ubuntu. I have free space of around 10 gb. I want to add this free space to my ubuntu drive. How can i do that?

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General :: Raid - RAID1 With Only One Disk

Oct 27, 2010

I have a hypothetical situation in which I installed my operating system using a RAID1 mirror. At some point I decided that this setup was overkill, my machine isn't system critical, I value doubling my storage space more than speedy recovery, I'm doing routine backups, etc...

Short of backing up my system volume and repartitioning, or otherwise starting over, is there a way I can reconfigure my RAID1 array to only expect one disk so that mdadm no longer reports a Degraded state?

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General :: RAID1 Resync Slow Using Mdadm?

Mar 11, 2010

I am running Kernel 2.6.18-128.el5 on a 64bit quad core machine with 8GB RAM. Using "mdadm" I setup a RAID1 array between two Western Digital 1.5TB drives. The problem is that the resync is running VERY slow. Here is a current status.

[root@royalflush shared]# cat /proc/mdstat Personalities : [raid1]
md1 : active raid1 hdc5[1] hda5[0]
1304493952 blocks [2/2] [UU]
[=>] resync = 6.2% (81592192/1304493952) finish=4280156.0min speed=4K/sec
unused devices: <none>

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General :: Trouble Booting Up To LVM Partition On Raid1

Jul 10, 2010

I been trying all day to boot debian on a lvm partition on a raid1. I have found some howtos but they only show how to do it for one or the other not both at the same time. Using those howtos I think I have grub2 setup right the problem is my kernel. It has support for both LVM and Raid built-in. I setup the raid and lvm partitions while running that kernel. But when I use it to boot up the system on the lvm/raid it gives a kernel panic.

The OS is by itself on an old disk sda1. The raid1 is on two other disks sdb1 & sdc1. It is divided into 2 logical partition vg-root & vg-media. I just copied the OS onto vg-root. Then tolled grub to boot to it. The grub entry is like so..I tried setting root=(md0) but that didn't work either. I'm pretty sure the problem is with the kernel but I don't see why since it can it can see the raid and lvm partitions once it is booted up and both the raid & lvm options are built into the kernel so it should be able to see them at boot time.

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General :: Create RAID1 Array With Given/fix HD Labels?

Aug 19, 2010

I have two HDs (let's say sda and sdb). Both are the same size and have the same partitions already (sda1/sda2/sda3 and sdb1/sdb2/sdb3). Basically they are ready to make a RAID1 array.

Writing with new udev rules, I could create and give fix HD labels with /sbin/scsi_id.

Example: For sdb1 I have a fix device name created under /dev as hd2_boot1, for sdb2 I have /dev/hd2_boot2 and finally for sdb3 I have created the device /dev/hd2_boot3.

With using the command "mdadm --create /dev/md0 --level=1 ....", I could create a RAID array.

But, when I check the status one of the RAID devices, like with the command "mdadm --detail /dev/md2", it still shows me as part of the RAID array the sdb* devices, not the hd2_boot* devices. Something like this:

I would like to see basically as member or the RAID array always the /dev/hd2_boot3 not the /dev/sdb3 (like above), is this possible?

Bottom line, I would like to keep the order of the RAID arrays depending their scsi ids, not depending their scsi numberings which is given by the kernel, since the scsi numberings (sda, sdb, sdc and etc.) can change depending the physical connection.

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General :: Recover A RAID1 Array Using Mdadm

May 12, 2010

I'm looking to recover a RAID1 array hopefully using mdadm. Ive not really used Linux much befor but I'm keen to learn to get my data back. Basically one of the disks in my Maxtor Shared Storage II (2x500GB sata) died and I could do with either rebuilding the array or getting the data off another way.

I have a spare machine I could use for recovery process. It has a spare drive but its only 120Gig, I also have a bigger 320gig disk but thats IDE not SATA. Do I need to purchase another 500GB sata drive or can I use either of my spares? If i do need to buy a new drive could I use a 1TB or 1.5TB or will it have to be 500? Next question is what is that best version of linux to use, I have knoppix 6.2 and Ubuntu (not sure on version) already. I noticed that mdadm isn't installed by default on Ubuntu.

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General :: Creating A RAID1 Partition With Mdadm On Ubuntu?

Jan 28, 2010

I'm trying to set up a RAID1 partition on my Ubuntu 9.10 workstation.On this dual-boot system, Ubuntu is running from a separate drive (/dev/sdc - an SSD that is quite small, which is why I need more disk space). Besides that, there are two traditional 500 GB hard drives, which have Windows 7 installed (I want to keep the Windows installation intact), and about half of the space unallocated. This space is where I want to set up a single, large RAID1 partition for Linux.

(This, to my understanding, would be software RAID, whereas the Windows partitions are on hardware RAID - I hope this isn't a problem... Edit: See Peter's comment. I guess this shouldn't be a problem since I see both drives separately on Linux.)On both disks, /dev/sda and /dev/sdb, I created, using fdisk, identical new partitions of type "Linux raid autodetect" to fill up the unallocated space.

Device Boot Start End Blocks Id System
/dev/sda1 1 10 80293+ de Dell Utility
/dev/sda2 * 11 106 768000 7 HPFS/NTFS

[code]....

But so is "Device or resource busy" when trying to create the RAID array. Quite strange.

Update: Could the device mapper have something to do with this? How do /dev/mapper and dmraid relate to all this mdadm stuff anyway? Both provide software RAID, but.. differently? Sorry for my ignorance here. Under /dev/mapper/ there are some device files that, I think, somehow match the 3 Windows RAID partitions (sd{a,b}1 through sd{a,b}3). I don't know why there are four of these arrays though.

$ ls /dev/mapper/
control isw_dgjjcdcegc_ARRAY1 isw_dgjjcdcegc_ARRAY3
isw_dgjjcdcegc_ARRAY isw_dgjjcdcegc_ARRAY2

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General :: Lost Access To Some Files On A Raid1 Volume / Fix It?

Nov 22, 2010

Hoping that someone else has seen this before and can offer a quick fix.

I have a software raid1 volume that has a few directories with files that lost all the security information code...

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General :: Migrate An Existing System With RHEL5 OS To RAID1?

Mar 7, 2011

I am trying to migrate my existing system with one IDE disk , tools installation already done... without loosing informations and having to install once again every things, to RAID1 (soft) with a second IDE disk I tried to do this using somme informations given on forums but i always have a kernel Panic at the end of boot What I did:

The system is going down for system halt NOW!
login as: root
root's password:
/usr/bin/xauth: creating new authority file /root/.Xauthority

[code]....

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General :: Mirror The Boot Partition On Existing Raid1?

Feb 26, 2011

I have a raid1 setup on a machine. Recently it died and I thought one of the drives had failed as it was shooting errors. So I tried unplugging that drive get it to boot off the mirror but it seems the techs forgot to mirror the boot device so the 2nd drive can't boot on its own. After a while it was realized that the sata cable was in fact bad and replaced so now its working again.

However, this occurrence showed a flaw in the setup where the RAID1 isn't working as its supposed to. I would like to correct this. Can I somehow mirror the boot partition so the 2nd drive will boot independent? I'm not sure how I would go about this. This is a CentOS 5 installation.

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General :: Difference Between Raid1 And Ordinary Hard Disk?

Jun 8, 2011

Is there a difference between raid1 and ordinary hard disk?

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General :: Create A RAID1 (mirroring Only) Array With 3 Live Drives?

Jun 16, 2010

I'm not entirely a newbie, but this seems like such a simple question I'm not sure where else to ask it. I checked through the various HOWTOs and searched already and didn't find a clear answer, and I want to know for sure before we start investing in hardware. Is is possible to create a RAID1 (mirroring only) array with 3 live drives, rather than with 2 live plus a spare? Our goal is to have 3 drives in a hot-swap bay, and be able to pull and replace one drive periodically as a full backup. If I do:

[URL]

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