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2answers
144 views

Why is my dd slow when the blocksize is small?

According to articles on the web, mount with nobarrier will speed the disk up: Write small blocks of data to img (with barrier): SLOW # dd if=/dev/zero of=xfs.img bs=1024 count=20000 # mkfs.xfs ...
1
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1answer
37 views

Fast filesystem for virtual backup environments

I know filesystem supporters war is behind the corner and there are plenty of fine tuning guide for each filesystem in the wild, so please stick to the specifications: I'm asking what would you ...
1
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1answer
124 views

Changing label of xfs root file system

I'm running a centos 7 server. I want to change the label of the root file system (xfs). xfs_admin -L "newlabel" /dev/mapper/centos-root fails because it can't operate on a mounted fs. Is this ...
0
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1answer
9 views

fedora 23 update kills XFS-how to install new xfsprogs?

I've been running 4.4.5 and it's been stable. I got the update prompt from Gnome Software and figured WTF I'll run it on reboot. I came back into the room to Fedora in emergency mode prompting for ...
0
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1answer
37 views

xfsrestore: unexpected tape error

I'm trying to test tape backup of a specific directory, made using: xfsdump -l 0 -f /dev/nst0 -L "session label" -M "media label" -s mybackups /NFSMOUNT Checking the dump contents succeeds without ...
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1answer
58 views

To run once again mkfs.xfs quickly

I run mkfs.xfs -f -L /partitionname -d agcount=64 -l size=128m,version=2 /dev/sdb1 but noticed that enough without Label with UUID, while the old when RHEL used partition labels, as discussed here: ...
5
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0answers
49 views

md raid5: translate md internal sector numbers to offsets

TL;DR summary: Translate an md sector number into offsets(s) within the /dev/mdX device, and how to investigate it with xfs_db. The sector number is from sh->sector in ...
2
votes
0answers
65 views

How are XFS deltas for xfsdump -l n calculated?

I have a xfs filesystem with many small and a couple very large files (~100GB), its on a lvm2 volume. I want to do incremental backups from it. Is there any computational overhead when using a tool ...
2
votes
0answers
126 views

XFS over iSCSI share with cluster; will fencing cause data corruption/loss?

When using XFS on iSCSI share, where HA is enabled, nodes may be fenced by cluster. Will this result in data loss / corruption / etc. ?
2
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0answers
1k views

Unable to mount XFS volume after reboot - unknown filesystem type 'xfs'

I have an aws ec2 instance that's been running Ubuntu 12.04 for a good long while. It has attached to it an EBS volume formatted with xfs. Today after a reboot, I'm unable to mount this volume. ...
2
votes
0answers
272 views

DMX problem with fonts

I have problem with fonts in xdmx: I am starting new X startx -- /usr/bin/X11/Xdmx :1 -display 192.168.0.104:0 -fontpath tcp/192.168.0.102:7100 (II) dmx: Generation: 1 (II) dmx: ...
1
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0answers
33 views

How can I tell if xfs_repair is stuck or still running?

I have a backup server with ~72TB of space. Only about half of that is used. Earlier in the week I got the following message and directly after the xfs filesystem was unmounted. Mar 15 15:15:47 ...
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0answers
45 views

xfs partition table on RAID array corrupt

So, I'm usually fairly knowledgeable, and with google on my side am able to figure things out. This time however, I'm at a loss for figuring out what to do. background : I have a server I built, ...
1
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0answers
251 views

How to defrag XFS file-system if xfs_fsr exits with “no improvement will be made”?

I am trying to defrag a heavily fragmented XFS file-system on a CentOS 6.6 machine: [root@server opt]# xfs_db -c frag -r /dev/md3 actual 598, ideal 215, fragmentation factor 64.05% However, when I ...
1
vote
0answers
73 views

Unmount nested mounts not working after unmounted root of nest

I have a XEN Server, which I can't reboot. My boss has filesystems mounted as such strange way: /mnt/hda1/hda2 Then he unmounted them as such umount /mnt/hda1/ Now he can't unmount hda2 anymore. ...
1
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0answers
89 views

How is default readahead value determined

I have two different devices running XFS and the default readahead value set differs between the two disks. Why is that ? How is the default size computed ? Is it device dependent ? I might also add ...
0
votes
0answers
55 views

Unable to mount XFS after rescue, why?

I am facing a strange problem with XFS file system. Below is the exact scenario: I'd a corrupt 2TB disk with XFS (I/O error), so with that decided to rescue data from old disk to new disk. I'd run ...
0
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0answers
11 views

What is realtime section and realtime files of xfs?

http://man7.org/linux/man-pages/man5/xfs.5.html The realtime section is used to store the data of realtime files. These files had an attribute bit set through xfsctl(3) after file creation, before ...
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0answers
26 views

Why Labelling an XFS device doesn't accept spaces

I tried to label my external USB device to "USB DISK" using the following command: xfs_admin -L "USB DISK" /dev/sdb1 but was greeted with a usage screen. Then I tried: xfs_admin -L USB\ DISK ...
0
votes
0answers
149 views

Cannot add noexec to fstab /tmp/

Does anyone know why my Graphical Interface does not load after reboot when I remove " noexec " from fstab? So if I remove the " noexec " from the /tmp/ entry in FSTAB, it will load the GUI fine ...
0
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0answers
116 views

xfs directory quota doesn't work

now I have two tasks and I wanna run them in different directory and limit the directory's size. I use xfs's project quota to achieve this. I follow the steps from ...