[olug] SSD & linux

[Hurley, Rod]

One thing that improves SSD life, is not reusing the same memory locations unless absolutely necessary.  Obviously if your drive is filled, that is inevitable.  Also, flash SSD and RAM SSD have different lifecycles.  Flash is based upon number of read/write cycles, whereas RAM is more based upon elapsed time and heat stresses.  Some SSD use wear leveling algorithms, to help spread the load.  

Rod

-----Original Message-----
From: olug-bounces at olug.org [mailto:olug-bounces at olug.org] On Behalf Of Sheldon, Roger W
Sent: Monday, February 25, 2013 2:32 PM
To: Omaha Linux User Group
Subject: Re: [olug] SSD & linux

MY main reason is to prolong SSD life. Well I guess if you don't mind you can use your SSD and write everything to it like spinning platter. However from my readings SSD's have a  limited shelf life. But maybe I am amiss here as this is my first SSD I have purchased. The companies charge a premium for SSD's so I want to protect my investment. The second being performance. Not a true measurement for anything really but I do have a seven second boot time :). 



Roger Sheldon
Storage Engineer
wk 402.777.7901
cell 402.889.2585


-----Original Message-----
From: olug-bounces at olug.org [mailto:olug-bounces at olug.org] On Behalf Of Obi-Wan
Sent: Monday, February 25, 2013 1:49 PM
To: olug at olug.org
Subject: Re: [olug] SSD & linux

On a more comprehensive note, what's the point of all this?  Just to minimize the number of writes to the SSD in order to prolong its life?
Is it really that big a deal?

I recently installed an SSD as my root disk on my desktop.  I didn't make any SSD-specific changes in the process.  Is that such a bad thing?
The additional speed is sure nice, to the point where I'm considering moving some of my heavily-accessed cache files from /home (a 3-spindle
stripe) to /tmp (the SSD).

> Looking to optimized Linux Mint14, AMD 1100t, 32G, Radeon 7870, OCZ Vertex 256, HDD's. I think I need to look at configuring the scheduler and something else... can't remember lol. Anyway am I backing myself in the corner with these configurations or missing something here? Appreciate your insights or thoughts.
> 
> 
> I turned off journaling, and set the FS to be checked at regular intervals.
> $ sudo mke2fs -t ext4 -O ^has_journal /dev/sda1 $ sudo tune2fs -o 
> journal_data_writeback /dev/sda1 $ sudo tune2fs -m 5 /dev/sda1 $ sudo 
> tune2fs /dev/sda1 -i 7d $ sudo tune2fs /dev/sda1 -c 15 $ sudo tune2fs 
> -l /dev/sda1
> 
> Also set swappiness=5 since I got 32G ram and mounted /tmp and /var/logs into RAM so they get deleted on every reboot or shutdown.
> echo "vm/swappiness=5" >> /etc/sysctl.conf
> 
> Fstab
> UUID=522567a9-0f7d-475c-b495-661dc5569599 / ext4  data=writeback,noatime,discard 0 1
> tmpfs        /tmp        tmpfs   noatime,nodev,nosuid,noexec,mode=1777   0       0
> tmpfs        /var/log    tmpfs   defaults,noatime,mode=0755              0       0
> 
> Set FF to use memory for cache
> about:config
> Add a new string key named:
> browser.cache.disk.parent_directory
> set its value to:
> /tmp


-- 
Ben "Obi-Wan" Hollingsworth    obiwan at jedi.com    PrairieRimImages.com
   The stuff of earth competes for the allegiance I owe only to the
     Giver of all good things, so if I stand, let me stand on the
       promise that You will pull me through.  -- Rich Mullins _______________________________________________
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