SSD alignment and TRIM with Centos

[Linetux]

I hope that provides sufficient info for lifespeed and/or anyone else to understand what's needed to be done here...

A few more items of note:

The CentOS Plus kernel supports EXT4 as well as of 5.5. From what I understand, CentOS 6 will support EXT4, but I haven't been able to tell if that includes the option to use it at installation.

The reason I was a bit harsh in my last reply was that you'd given an example that didn't apply... unmounting the file system and converting is not the same as an 'in-place' changeout. It's also not for the weak of heart, as you've pointed out with your own examples.

Again, this is NOT something I'd suggest doing on a production phone system. Sometimes you need to wait for technology to settle a bit before going in 'guns blazing' with the latest and greatest things. Some of the biggest failures I've seen people take are due to using things that aren't quite ready for prime time in a production environment... sometimes it's a begin loss, other times it's a resume-updating event.

Thanks again for taking the time to actually perform the function in question. It's one that I've never had the extra time myself to do, so I appreciate it as I'm sure others do as well.

 

[lifespeed]

Well, that is alot to swallow for a Linux newbie, but I'm willing to give it a try. The hardware won't arrive for a few more days anyway.

As another approach to skinning the cat, would it make any more sense to install PIAF on a fresh Centos 5.5 install using Jroper's script? I suspect the filesystem would still have to be converted in-place.

Or is it six of one,half dozen the other?

Edit: thanks to all the responders. With the desire for one's PBX to be a small 'appliance', it seems this is a discussion whose time has come.

 

[luckman212]

Hmm, I know this is many months old now, but since there was never any update- I'm curious, Lifespeed did you ever carry out this experiment? What were the results?

 

[lifespeed]

I have done quite a lot with PIAF and am very happy with the results. My phone system does things a traditional setup could never do.

However, I decided that investing time in TRIM support by manipulating linux filesystems I am unfamiliar with was not likely to have much return on investment. After all, PIAF does not appear to be badly limited by SSD speed or capacity.

Besides, it appears a new version of PIAF is iminent which may soon contain TRIM support with a new version (5.6?) of CentOS.

 

[luckman212]

so, you are running PIAF on an SSD though? have you had any issues w. that vs just putting it on a traditional spinning platter hd?

 

[lifespeed]

Yes, I use an OCZ Agility 2 OCZSSD2-2AGT40G 2.5" 40GB SATA II MLC Solid State Drive with an Intel Atom D525 motherboard running PIAF Purple updated to Asterisk 1.8.3.2.

This is my first try at PIAF, so no spinning platter experience to compare it to. It boots fast and works. Not that I reboot it that often . . .

 

[luckman212]

Here is a list of 4 inexpensive (~100USD) SSD drives that I have narrowed down & am considering for my home piaf rebuild. Would any of these be better/worse than the others? I'm leaning towards the A-DATA unit since it has the newest SF controller, but appreciate any advice!

Intel 320 Series 40GB $109 Controller: ???
ADATA S599 40GB $99 Controller: SandForce SF-1222
Corsair Force CSSD-F40GB2-A 40GB $99 Controller: ???
OCZ Vertex 2 60GB $99 Controller: SandForce SF-1200?