[ale] SSD speeds

[Dustin Strickland]

You could save a few pennies and still keep your transfer speed(most
of the time) by using ZFS on HDDs and using a 20/40GB SSD as a cache.
You might be able to set up other filesystems to use an SSD cache as
well, but I'm not entirely sure.

On Wed, 02 Jul 2014 12:21:40 -0400
Chris Fowler <cfowler at outpostsentinel.com> wrote:

> Yesterday I received two systems we ordered and installed CentOS 6.5
> on them.  I am ignorant of SSD speeds and these systems have 2
> 128gb/ea I'm running as RAID1 via mdtools. I'm amazed at the speed
> compared to the SATA II/III drives I've been using.
> 
> In the past we've used drives because we wanted space.  In this
> project I would be happy with a 20GB SSD so space is not an issue.  I
> decided to give it a try. I like them.
> 
> Are write speeds slower that standard drives?  Is there any reason I 
> should not move forward with this model of using SSD in our systems
> vs real drives?
> 
> I do have rant about CentOS 6.5 text install.  I've googled it and I 
> understand why it is like this I just hate that I could do this in 5, 
> but not 6.
> 
> I've installed many CentOS 5 systems around the world.  In some cases
> I need to reinstall them.  I may be going to an older Fedora system
> to CentOS.  Or I may have corruption.   I may even install new
> hardware. What I do is create a serial bootable CD.  I then place a
> device on the server's serial port, connect remotely to it, and have
> the customer boot the CD.  I can now install in text mode remotely.
> If I'm working on a system that has already been loaded I'll copy
> vmlinuz and initrd.img to it, modify grub meny.lst and then boot that
> entry.
> 
> This works on CentOS 6 up until I get to partitioning disks.  You can 
> not do custom partitioning any more via text.  I had to install the 
> system in my lab last night via VNC.  This complicates these remote 
> installs because I have to figure out a way to gain remote IP
> access.  I think the only solution is to create a kickstart file.  On
> a new system that the customer purchases I will need to know about
> the drives before I can create the file to partition them.  Forcing a
> graphical install just sucks and to me that is anti-server and
> pro-desktop.
> 
> Just my rant, ignore it. :)
> 
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