Tagged Questions
1
vote
1answer
72 views
100% SSD usage Linux
Every 20-30 seconds my HDD usage goes to 100% (iostat).
iotop is showing that [flush-8:0] is using 99% HDD during these times. In between HDD usage is 1-10%.
iostat output:
04/22/2013 08:58:44 AM
...
1
vote
2answers
60 views
Strange behavior with `find -delete`
I'm using Ubuntu 12.04 with 2 x 2TB SATA3 harddisks in software RAID1. The filesystem is ext4 with data=writeback.
When using find . -maxdepth 1 -name '*' -delete to delete a large number of files in ...
0
votes
1answer
170 views
file read performance degrades as number of files increases
We're observing poor file read IO results that we'd like to better understand. We can use fio to write 100 files with a sustained aggregate throughput of ~700MB/s. When we switch the test to read ...
0
votes
1answer
139 views
Trade reliability for speed in a slow filesystem
On my box running Ubuntu Server 11.10 I have a rather slow soft RAID6 array on four USB sticks (and no other means for persistent storage).
I want a faster filesystem on that box.
I'm OK if I'd lose ...
0
votes
1answer
137 views
Problems with degraded RAID arrays
My Ubuntu backup server was recently upgraded in storage space to a RAID 10 array... now it consists of 8T of raw drive space which was before 2T of space.
But I have been having trouble when it ...
-1
votes
1answer
165 views
Help, ive just corrupted my ext4 partition
After troubleshooting problems with my mdadm config and kernel settings for about a week now i got careless and left my data drives plugged in after a successful boot test.
i was attempting to change ...
3
votes
2answers
441 views
Is data=journal on a separate device on Ext4 as good as using a RAID controller with battery backed cache for file system consistency?
It seems to me that data=journal prevents file system inconsistency in the case of power failure. Using it with a dedicated journal device mitigates the performance penalty of writing the data twice. ...
0
votes
2answers
2k views
mdadm lvm and ext4 slowness - How can I speed it up?
I can't figure out why I'm getting such terrible times out of my mdadm and in particular the lvm partitions in it.
I made the raid:
mdadm --create --verbose /dev/md0 --level=5 --chunk=1024 ...
0
votes
1answer
1k views
Ubuntu 10.04 with ext4 gets repeated IO errors
we installed a new DELL server with the (not supported) Ubuntu 10.04 LTS. We configured a hardware RAID (I think RAID 1) with the DELL tools before installing Ubuntu.
The server is not under load at ...
