On Tue, Jul 28, 2009 at 3:56 PM, Kenneth Marshall k...@rice.edu wrote:
Kage,
The main advantage is gained by avoiding I/O through the virtual
disk. The layout of the virtual disk tends to turn most I/O into
random I/O, even I/O that starts as sequential. The factor of
10 performance
On Jul 29, 2009, at 7:10 AM, Robert Nesius wrote:
On Tue, Jul 28, 2009 at 3:56 PM, Kenneth Marshall k...@rice.edu
wrote:
Kage,
The main advantage is gained by avoiding I/O through the virtual
disk. The layout of the virtual disk tends to turn most I/O into
random I/O, even I/O that starts
Hi Matt,
Raid is not the end-all be-all for disk safety, especially when you step
into terabyte class computing, sorry I am taking this a bit off topic. While
RAID has it's bonuses, there are drawbacks as well, take your standard RAID
5 setup, 4 Disks, 3 active, 1 Hot Spare. Now lets say that
On Jul 29, 2009, at 10:44 AM, William Graboyes wrote:
Hi Matt,
Raid is not the end-all be-all for disk safety, especially when you
step into terabyte class computing, sorry I am taking this a bit off
topic. While RAID has it's bonuses, there are drawbacks as well,
take your standard
Well, basically, Postgres is seemingly a bucket of fail specifically
for the RT system I maintain. We run RT/Postgres on a Ubuntu Hardy
LTS virtual machine running 2 virtual CPUs and the KVM maximum of 2GB
RAM, but Postgres ends up using so much in resources that it actually
kills the entire KVM
On Tue, Jul 28, 2009 at 03:35:12PM -0400, Kage wrote:
Well, basically, Postgres is seemingly a bucket of fail specifically
for the RT system I maintain. We run RT/Postgres on a Ubuntu Hardy
LTS virtual machine running 2 virtual CPUs and the KVM maximum of 2GB
RAM, but Postgres ends up using
(didn't do a reply-all, sorry if you get this twice, Ken)
What, if any, performance gains exist by using an NFS mountpoint for
the Postgres database within a virtual machine? In this case, I/O is
not directly placed on the virtual disk (unless the actual act of
I/O itself, regardless of what is
Kage,
The main advantage is gained by avoiding I/O through the virtual
disk. The layout of the virtual disk tends to turn most I/O into
random I/O, even I/O that starts as sequential. The factor of
10 performance difference between random/sequential I/O causes
the majority of the performance
