Tagged Questions

0
votes
1answer
35 views

Should getfacl be running constantly and is it normal for it to be using greater than 90% of available disk I/O?

I've recently been getting alerts from our server monitoring software about greater than 90% disk I/O utilisation. I installed iotop and there are three instances of the following process showing up ...
0
votes
1answer
338 views

Safely resizing partitions in CentOS 6

I have deployed two VMs on VMware with CentOS 6.3 Net Install. It has automatically created some partitions. It has created two major partition for root and home. root partition has size of 50GB and ...
2
votes
2answers
1k views

Rebalance CentOS / RHEL Ext4 LVM assignment

Our corporate standard is CentOS (which seems to prefer LVM), and I come from primarily a non-LVM background, so I'm treading new ground with this issue. I inherited an older machine as a log-server ...
0
votes
3answers
773 views

How to disable barriers?

It seems impossible to disable barriers. I have tried loading the kernel with "mount -o barrier=off", "mount -o barrier=0", "barrier=off" and "barrier=0". The kernel is Atomic Secure Linux 2.6.32 with ...
0
votes
1answer
160 views

Creating a new Partition on Centos Linux

I installed a Centos and partitioned it as: /root - 100MB / - rest of the disk. I need to have a /log partition. is it possible to do it after the Linux was already installed? Thanks!! Dotan.
0
votes
2answers
559 views

smartd: Device: /dev/sda, FAILED SMART self-check. BACK UP DATA NOW

System: Centos 5.5 64bit RAID: Linux Soft RAID with 2 Disks Mirror Smartd complains about the disk failure in system log: [root@xxx ~]# tail /var/log/messages Jul 3 10:22:45 w11 smartd[6043]: ...
0
votes
1answer
575 views

Xen Disk Performence Issues

I'm currently using Xen PV on CentOS 5 with my domU's as flat files running on a hardware RAID controlled (write cache enabled) formatted with XFS. On the dom0 I can get about 500MB/s in a 2GB dd ...
2
votes
1answer
340 views

CentOS Disks and Mounts

I have a web server and I'm confused about how the disk space has been allocated by the company I'm renting it, a dedicated one with a simple RAID mirror at 500Gb. Here is the output of df-h ...
0
votes
5answers
459 views

Linux Centos Disk information on HP DL 160

I have a HP DL 160 and I would like to know all possible information on my physical disks. I want to know how many physical disks I have. I want to know if they are in raid 1 or raid 5 etc. I want to ...
2
votes
2answers
813 views

df showing wrong disk size

Df -h is showing a wrong empty space on my server, for one of the disks: /dev/sda2 450G 393G 34G 93% / Cpanel shows that it has only 34GB free, but there is a lot more. A few ...
0
votes
4answers
452 views

How can I get a list of Programs doing Disk IO?

I have a server (running CentOS 5) and I need to figure out which programs (MySQL, Apache, etc) are doing the most Disk I/O? Is there a command that will allow me to calculate an average over time?
1
vote
2answers
162 views

Bad motherboard / controller / HDs?

On a leased server, I am running into some timing issues with an application that requires precise timing. Server is a Dual Xeon E5410 running on a Supermicro X7DVL-3 motherboard under CentOs 5.5 ...
0
votes
1answer
317 views

How do I solve the problem of high disk usage?

I run a fairly busy media site and I store the streamable media on a SATA HDD on the CentOS server. The hard drive is dedicated for just the streamable media. The media is streamed using Flash Media ...
2
votes
2answers
1k views

cp and cat on Centos 5.5/ext3 is 10x slower for files in certain directories

I was sorting some large files (91GB across 27 files) with GNU sort when I noticed that iostat -dxk 3 showed very slow read speeds, between 5 MB/s and 10 MB/s, with 100% disk utilization. I tried cat ...
0
votes
2answers
173 views

CentOS: How to tell if a server has BBU turned on? How many disks?

I got a new VPS. It's running CentOS 5.5. The hosting company said some VPS nodes have RAID BBU while some don't. How do I tell whether my VPS node has BBU or not? Also is there a way to tell how ...
6
votes
4answers
185 views

Frequently accessed files and I/O usage

I'm curious, from a performance standpoint, is there an advantage in storing all files in one directory versus having each file in a separate directory? I'm not concerned about organization. Also, ...