Re: [CentOS] Strange performance issue on CentOS 6.7 server

2016-02-04 Thread Warren Young
On Feb 3, 2016, at 3:23 PM, Alfred von Campe wrote: > > On Feb 3, 2016, at 17:10, Warren Young wrote: > >> smartctl can see through several different types of RAID controller to the >> underlying physical disks via its -d option. > > This is what I have: > > # smartctl

[CentOS] Strange performance issue on CentOS 6.7 server

2016-02-03 Thread Alfred von Campe
I’m running CentOS 6.7 on my build servers, and on one of the servers the builds are taking almost an order of magnitude longer than usual. There are no runaway processes and there is plenty of free memory. So I suspected that file I/O might be slow, and sure enough, that appears to be the

Re: [CentOS] Strange performance issue on CentOS 6.7 server

2016-02-03 Thread Warren Young
On Feb 3, 2016, at 1:30 PM, Alfred von Campe wrote: > > I suspected that file I/O might be slow, and sure enough, that appears to be > the case….What could cause this A dying hard disk can do it. HDDs try to silently paper over I/O errors, but what they can’t hide is

Re: [CentOS] Strange performance issue on CentOS 6.7 server

2016-02-03 Thread Alfred von Campe
On Feb 3, 2016, at 16:13, Warren Young wrote: > A dying hard disk can do it. HDDs try to silently paper over I/O errors, but > what they can’t hide is the time it takes to do this. If your HDD is > constantly correcting errors at the oxide layer, it will be reallly > sow. > > You

Re: [CentOS] Strange performance issue on CentOS 6.7 server

2016-02-03 Thread Warren Young
On Feb 3, 2016, at 2:26 PM, Alfred von Campe wrote: > > On Feb 3, 2016, at 16:13, Warren Young wrote: > >> A dying hard disk can do it. HDDs try to silently paper over I/O errors, >> but what they can’t hide is the time it takes to do this. If your HDD is >> constantly

Re: [CentOS] Strange performance issue on CentOS 6.7 server

2016-02-03 Thread m . roth
Alfred von Campe wrote: > On Feb 3, 2016, at 16:13, Warren Young wrote: > >> A dying hard disk can do it. HDDs try to silently paper over I/O >> errors, but what they can’t hide is the time it takes to do this. If >> your HDD is constantly correcting errors at the oxide layer, it will be >>

Re: [CentOS] Strange performance issue on CentOS 6.7 server

2016-02-03 Thread Alfred von Campe
On Feb 3, 2016, at 17:10, Warren Young wrote: > smartctl can see through several different types of RAID controller to the > underlying physical disks via its -d option. This is what I have: # smartctl --all /dev/sda smartctl 5.43 2012-06-30 r3573 [i686-linux-2.6.32-573.12.1.el6.i686] (local

Re: [CentOS] Strange performance issue on CentOS 6.7 server

2016-02-03 Thread James Hogarth
On 3 Feb 2016 22:24, "Alfred von Campe" wrote: > > On Feb 3, 2016, at 17:10, Warren Young wrote: > > > smartctl can see through several different types of RAID controller to the underlying physical disks via its -d option. > > This is what I have: > > # smartctl --all