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
