I'm using Ubuntu 14.04 to run a web/DB server.

Disks are in a RAID6 set, using XFS. I'm somewhat new to XFS.

Suppose I have 2 heavy IO operations. In my example:

  • Reindexing a 400 GB database.
  • Copying over a 500 GB backup, consisting of 5000 files.

Because both are writing to the disk simultaneously, is there any risk of fragmentation that could affect performance?

(I could run xfs_fsr to defrag but I'm curious since that takes time/load on large live data sets.)

Details for those who asked: This is on an EC2 server, using ephemeral storage (I know, use with caution). I mount using: sudo mount -t xfs -o noatime /dev/vg0/ephemeral /ephemeral

Here is my xfs_info: meta-data=/dev/mapper/vg0-ephemeral isize=256 agcount=32, agsize=32526464 blks = sectsz=512 attr=2 data = bsize=4096 blocks=1040846848, imaxpct=5 = sunit=128 swidth=768 blks naming =version 2 bsize=4096 ascii-ci=0 log =internal bsize=4096 blocks=508232, version=2 = sectsz=512 sunit=8 blks, lazy-count=1 realtime =none extsz=4096 blocks=0, rtextents=0

1 Answer 1


It depends on your XFS configuration. If you have some level of preallocation set on your filesystem, the impact of fragmentation will be lower than without.

See: Why are my XFS filesystems suddenly consuming more space and full of sparse files?

Can you post the xfs_info for your filesystem and the output of /etc/fstab?


You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .