General :: Where Is The Missing Disk Space On Software Raid
Nov 3, 2010
Purchased (4) 2TiB Drives (actual disk space) and created a RAID5 array expecting to have 6TB of useable disk space, however actual useable space is 5.46TiB.
So, the question is where did the disk space go?
First off, I can say for certainty the disks actual useable is verified at 2TB each have mounted and formated on a non-linux system (OSX).
Disks - 2TB Per disk, Tested HFS, Actual 2TB Useable
root@server:/server# fdisk -l 2>/dev/null | egrep "sd[hijk]" | grep Disk
Disk /dev/sdh: 2000.4 GB, 2000398934016 bytes
Disk /dev/sdj: 2000.4 GB, 2000398934016 bytes
Disk /dev/sdk: 2000.4 GB, 2000398934016 bytes
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Mar 13, 2011
I have a dedicated server that has CentOS 5.5 installed.. I can access that server via SSH as root. Now the issue is.. httpdocs folder is situated in /var where all website data is stored. I have more than 50GB of website that needs to be transfered to this partition but this partition is of 4.0GB..
# cat /etc/fstab
/dev/md1 / ext3 defaults 1 1
/dev/sda2 none swap sw
/dev/sdb2 none swap sw
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Jan 15, 2011
My root partition seems to missing 1.6 GB of space. From "df -k" I get this output code...
I can't find any rootkits with rkhunter and chkrootkit, and fsck reports no errors.
Does anyone have any idea what might be going on here?
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Jun 13, 2010
I use vuze. I added some torrents to it, but some time after i removed them using vuze's interface. I did these steps:
1. Right button click
2. Remove and
3. Remove both
After doing this, there was no change in my free disk space and some bizare things started to happen. Here is a screenshot about free disk space confusion that is happening. The partition is ext3. Does anyone know what could be the cause of this? How can i fix this? Does anyone experienced the same problem?
Here is a screenshot showing differences in free space displayed by nautilus and df.
Captura_de_tela.jpg P.S.: if this is the wrong forum or thread, please can someone indicate the right one?
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Aug 18, 2010
I started getting this warning that my Home partition disk space was running low, so I ran a disk space analyzer which only told me that I was using about 650 MB. Since I had 5 GB allocated to the home partition, I knew that something was not right. After manually going through all of the primary subdirectories on home, I found the culprit, namely an unexecuted game installation directory taking up about 4.5 GB. So I deleted the files, but then I didn't get my disk space back. I rebooted, no change. I ran this program called sfill, part of Secure Delete, which is supposed to wipe the directory 38 times and totally clean everything off. Still, no change. Any ideas how to reclaim my disk space?
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Feb 19, 2010
I seem to have a major discrepancy between what df reports and what du reports. df tells me that I am using 20G, but I am only able to find 9.5G using du. What follows are the ls -l of root, a df of my system, and the du for every directory in root that is not a symbolic link, mnt, or proc. I would appreciate any suggestions on where to look for the remaining 10.5G that seems to have disappeared.
I am running under VM Player code...
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Jun 22, 2011
I recently decided to wanted to switch from windows to ubuntu 11.04 since linux can do the same work as windows for me. While going with a fresh installation of linux by itself I noticed that instead of my original laptop hdd space of 350gb it said allocated 320gb. I went with the install and now that it is ready the disk manager says I have 280gb space what is this please? Should I reinstall ubuntu to get the missing hd space ?
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Apr 14, 2010
One of my raid disks (was a software raid5 with 4 drives) failured. I wanted to buy a new 1.5TB harddisk anyway so i i copied all the Raid data onto the new disk and disconnected the old ones. But then the new Disc crashed right before i could mirror it with another 1.5TB disk. So i need to reassemble my old Raid 5 now. I connected the drives in the former order except the first one, because this was the failed disk. The problem is, mdadm can't find the raid, no superblocks. Fdisk doesnt show mdraid superblocks, too. But fdisk has never showed superblocks. The thing is, this raid was crypted, but i crypted the /dev/md0, so this doesn't affect anything here, or?
some infos:
Code:
server:~# mdadm --misc -d /dev/sda
mdadm: option -d not valid in misc mode
server:~# mdadm --misc -t /dev/sda
[code]....
Disk /dev/sdc doesn't contain a valid partition table But fdisk always said there is no valid partition table and the raid was working.
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Nov 23, 2010
My raid array has failed. I have two disks /dev/sda and /dev/sdb./dev/sdb has failed and I could not rebuild the array(madm returned that the device is busy) so I rebooted the machine. After that, the whole sdb disk went missing, as it now only shows sda in fdisk -l.Did the disk went totally dead or my raid glitched?
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Feb 24, 2011
root@localhost:~ $ df /dev/sdb1
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/sdb1 1922858352 23247088 1801935664 2% /mnt/external/sdb1
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Nov 18, 2010
I don't understand disk sizes in Linux. I have a 500GB drive. It's ext4. I have run "tune2fs -m 0" on it to reserve the amount of space reserved for root to 0.
I'm using Ubuntu 10.04 that comes with a Disk Utility. When I run "System->Administration->Disk Utility (palimpsest)" the disk shows up as 500GB (see picture). But when I run df -h it shows up as 459GB. So, I don't understand the discrepancy.
When I run df I get the following:
Question: Why is Disk Utility showing me something different than "df"?
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Jan 31, 2010
Today I was installing a lot of software since I'm just setting up my Slackware system again after a fresh install, and I realized that my root partition has very little space left.
Here is the output of df -h:
Code:
As you can see, I have a 20G (19G here for some reason) root partition, 8G /var, and 86G of /home. I thought this would be plenty since many recent recommendations for / are 10-15G. Now, though, 17G are used up for some reason! How is this possible? I thought a full slackware install only had about 4G of software! I don't have any music or movies or any crazy huge files that I know of, and those would be in my /home directory anyway. Is there any way I can see which files are taking up all this space?
If it's necessary to allocate more space to my / partition, is it still possible to boot up a GParted live Cd, shrink /home a bit, move some partitions to the right, and expand my root partition? I would REALLY prefer I don't have to reinstall since I just spent a ton of time setting up my system again, but if worst comes to worst ... :'-(
In case you're curious, here's my /etc/fstab:
Code:
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Nov 10, 2009
My disk space has grown from 30% to 60% in the last 3 months.
I can only assume this is from log files in the form of maillogs and squid logs.
Any ideas on how to free up the space? I'm pretty sure I have logroate running.
I just ran this on the mail log files:
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Aug 17, 2009
I got the Hp 2133 mini notebook not to long ago maybe back in april. But they got a linux instead of Windows. I have yet to save anything on the computer, but everytime i logged on, i was usuing up disk space. Now I cant even log on and it gives me the message GDM Could not write to your authorization. Im sure i am not the first to receive this message. I dont know what to do. Its a Suse Linux Enterprise Desktop 10. I tried entering commands that ive seen on here that helped others. But its not working for me. I havent been able to use the laptop since may.
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Aug 25, 2009
OS: RHEL AS 5 64-bit
HDD:300 GB Hardware mirror (HP blade bl460c)
While installing OS, in partition window after OS file system structure I've left 277 GB. But after installation it shows Size - 255GB and available disk space is 242 GB.
Isn't it weired? How can I use the total amount of space in Linux? I need the whole 277GB exactly. What should be my workaround?
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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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Feb 22, 2010
Suddenly my disk that contains everything but the home dirs and which is usually only approx 9% full is now 100 % full.Any suggestions on how to find how this has happened? How can i find the largest files minus the mounted dirs which are on other disks?
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Sep 29, 2009
Had this problem in a few different instances where a process was creating a set of files in directory and using those files.
Some one just happened to go to the dir and deleted those files without stopping the process. The result being that as the process is still telling the machine that the disk usage is still what it initially was (df -h shows the old disk usage) , where as a du -h or a ls -lh on that same dir show that the files are not there.
Once this happened with mysql where the user delete the database dir in /var/database_name in the mysql home dir. The result being that the dusk usage was still showing as the old one even if the files were missing. This was resolved by restarting the mysql server.
Similar thing happened with some other processes where on restarting the problem was resolved..
My question being is there a method to solve this problem by whithout restarting the concerned process.. Some magical command like free disk or recheck dis usage :-) .. may be too much to ask but can some one help me out here.
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Jun 2, 2011
I want to use awk to list all the mount points, disk size and space available. Now I have all that info but I want to round the totals, so there is no delimiters, how can I do that?
PHP Code:
#!/bin/sh
date
df=`df -Pl | grep "^/dev" | awk '{print $6, $2/1024 , $4/1024}' | sed "s/%//"`
echo "$df"
[Code]...
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Aug 4, 2010
I want to build a 6xSATA RAID 5 system with on of the disks as spare disk. I think this give me a chance of 2 of 6 disks failing without losing data. I am right?
Hardware: Intel ICH10R
First I will creat a 3xSATA RAID 5, after I will add the spare disk and after that I will add the others disks. This is what I think I should do.
Step 1:
Create RAID Device
Code:
mdadm --create --verbose /dev/md0 --metadata 1.2 --level=5 --raid-devices=3 /dev/sda1 /dev/sdb1 /dev/sdc1
I read that "--metadata 1.2" is the best option. It is true?
Create filesystem on the RAID device
Using this method of calculation:
* chunk size = 128kB (for RAID 5)
* block size = 4kB (recommended for large files, and most of time)
* stride = chunk / block = 128kB / 4k = 32kB
* stripe-width = stride * ( (n disks in raid5) - 1 ) = 32kB * ( (5)- 1 ) = 32kB * 4 = 128kb
Then:
Code:
mkfs.ext3 -v -m .1 -b 4096 -E stride=32,stripe-width=128 /dev/md0
Step 2:
Add spare-disk
Code:
mdadm --add /dev/md0 /dev/sdd1
Is this enough?
Step 3:
Adding disks:
Code:
mdadm --add /dev/md0 /dev/sde1
mdadm --grow /dev/md0 --raid-devices=4
fsck.ext3 /dev/md0
resize2fs /dev/md0
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Aug 12, 2010
I just configured two raid setups but after a reboot they are not mounted and seem to be inactive.
md127 = sde1, sdf1 and sdi1 (raid 5)
md0 = sda1 and sdh1 (raid 0)
Code:
root@server /]# cat /proc/mdstat
Personalities :
md127 : inactive sdf1[1](S) sde1[2](S)
78156032 blocks
md0 : inactive sda1[0](S)
488382977 blocks super 1.2
unused devices: <none>
Code:
[root@server /]# fdisk -l | grep "Disk /"
Disk /dev/sda: 500.1 GB, 500107862016 bytes
Disk /dev/sdb: 80.0 GB, 80026361856 bytes
Disk /dev/sdc: 122.9 GB, 122942324736 bytes
Disk /dev/sdd: 160.0 GB, 160041885696 bytes
Disk /dev/sde: 40.0 GB, 40020664320 bytes
Disk /dev/sdf: 40.0 GB, 40020664320 bytes
Disk /dev/sdg: 1500.3 GB, 1500301910016 bytes
Disk /dev/sdh: 251.0 GB, 251000193024 bytes
Disk /dev/sdi: 40.0 GB, 40020664320 bytes
Disk /dev/sdj: 500.1 GB, 500107862016 bytes
Code:
[root@server /]# cat /etc/mdadm.conf
DEVICE /dev/sdi1 /dev/sdf1 /dev/sde1 /dev/sda1 /dev/sdh1
ARRAY /dev/md127 UUID=5dc0cf7a:8c715104:04894333:532a878b auto=yes
ARRAY /dev/md0 UUID=65c49170:733df717:435e470b:3334ee94 auto=yes
As you can see they now show up as inactive. And for some reason sdi1 and sdh1 are not even listed. What can I do to get them back? To make matters worse I placed some important data on them, and even if I was clever enough to keep an extra copy on another drive, guess which drive that was? So, I need to get them activated as is (at least so I can get the data of them) before I can rebuild them from scratch. I'm running Mandriva 2010.1 and rated tehm using the built in disk partitioner.
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Sep 20, 2010
I am running Ubuntu 10.04 on one 80GiB disk partitioned as two equal. The second one is mounted as my home folder. The reasons for the partitioning are historic and I don't think they're relevant here.
My problem is that Ubuntu frequently reports 'Low Disk Space'. The initial solution was to turn off backups and that seemed to ease the problem. Now it has started happening again, but backups are still turned off. I can't see anything unusual in the tmp directory - or anywhere come to that - but I don't really know where to look.
I have searched for known leaky problems but haven't found anything that seems to fit. I don't store images, videos or music.
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Jun 16, 2011
I am running centos 5. So far, it gives no problem but just yesterday, when it reported "no free space" for file writing, I try to remove some file as usual. Unfortunately this time no matter how much files I had deleted, it just keep showing no available space for doing so.
Result from df:
[root@LSMSVR ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol00
1.2G 269M 879M 24% /
/dev/hda6 4.8G 138M 4.4G 4% /tmp
/dev/hda5 19G 2.4G 16G 14% /usr
/dev/hda3 48G 12G 34G 25% /var
/dev/hda2 379G 365G 0 100% /home
/dev/hda1 99M 15M 80M 16% /boot
tmpfs 180M 0 180M 0% /dev/shm
ow to recover the lost space in /home?
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May 26, 2009
The partition is formatted to ext3, starting with block 1 on the drive. The mount point for /dev/sdc1 lists 0 files when doing `ls -A` `df -h` shows that the partition has 92MB used. How is this space being used, and how can I free it up?edit: I guess this isn't a newbie question.
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Nov 10, 2010
I seem to be running low on disk space on my linux server. 'df' shows about 82% usage on a stock CentOS install with sendmail. I routinely delete old email directories, but for some reason, I stay pretty high in disk usage. Is there a fancy little bash script or something I could run that would find the biggest files and I could go get rid of them?
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Feb 23, 2011
I am using Ubuntu in a laptop. The C disk has 15GB, and Windows is installed in C disk. I installed Netbook Ubuntu in D disk which only has 10GB free space. Now I am trying to install some applications in ubuntu such as emacs. But the system says it only has about 450Mb disk space. So how could I get more space? Can I install the applications under some different path? without using apt-get?
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Aug 4, 2010
For a given directory, I want to know the space occupied on disk by it and all files and directories having it as an ancestor, so to speak. Is there a command for this in linux?
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Mar 15, 2011
I newly installed debian squeeze with software raid. The way I did was, as also given in this thread.
- I have 2 HDD with 500 GB each. For each of them, I created 3 partitions (/boot, / and swap)
- I selected the hard drive and created a new partition table
- I created a new partition that was 1GB. I then specified to use the partition as a Physical Volume for RAID. and used for /boot and enabled bootable.
- Created another partition, which is of 480 GB, and then specified to use the partition as a Physical Volume for RAID. and used for /.
- Created another partion and used for swap
Then RAID configuration:
Through Configure RAID menu -> create MD device ->
(2 for the number of drives, 0 for spare devices)
Next select the partitions you want to be members of /dev/MD0. I selected /dev/sda1 and /dev/sdb1 (for /boot)
Next select the partitions you want to be members of /dev/MD1. I selected /dev/sda6 and /dev/sdb6 (for /)
And no RAID for swap partitions
'Finish Partitioning and write changes to disk' --> Finish the rest of the install like normal. Everything is ok now, except I am not sure how to test my raid config. When I pull the power of the HDD, it only boots from one disk. I read in some forum that I may have to install GRUB manually on the other. In Debian Squeeze, there is no grub command. Not sure how to make my software raid bootable from both disk. I configured /boot partitions of both disks to be boot=yes. Not sure whether that is ok.
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Apr 4, 2010
I have installed a Fedora Core 12 Linux system onto a RAID 1 file system. I now need a way of getting an notification if the disk fails. Is there an SNMP MIB that covers Intel RAID? I have done the searching but still the answer alludes me.
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Dec 12, 2009
I have a 5 disk raid 5 array that is composed of SATA A:0,1; SATA B: 0,1, and SATA C:0, and one of the disks (SATA A:0) recently went bad on me. I have an ICP raid controller that is about 5 years old. I replaced SATA A:0. After rebooting, I went into the controller and verified that it saw the disk in the hard-disk info section...there I noticed that in the "status" section, that the SATA C:0, SATA B:1 disks were listed as being "in array", the SATA A disks were blank, and the SATA B:0 disk was listed as "fragment". When I go into the "repair array" section, the controller tells me that there are no arrays that are in failure, error, or need to be rebuilt.
This puzzles me, as I thought the controller would know that the array needs to be rebuilt after replacing the disk and I don't see a way to initiate a rebuild. If I just let the server boot after replacing the disk, then I get back that there are the correct number of disks in the raid 5 and that it is ready, however, the screen then goes blank and I get a blinking cursor and the system seems to hang. There are no activity lights on any of the drives associated with the raid 5, which makes me think that the system is not rebuilding the array at this point.
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