Tags: mirror

01/24/13

  10:23:00 pm, by The Dreamer   , 1549 words  
Categories: Hardware, Computer, Storage, Ubuntu, FreeBSD

SSD Craziness

Over the last year, I started buying SSD drives. It used to be that they seemed pretty expensive, and of questionable performance and reliability. But, all things have improved over the years. And, when 120GB drives dropped under $1/GB (initially after rebates, later before rebate [if any]). I didn't have an immediate need for an SSD drive at the time, but I envisioned replacing the drive in my (u) laptop. And, perhaps my (w) laptop....beyond that I wasn't sure.

 3/05/12 - Patriot Pyro 120GB             - $159.99-$40 rebate = 119.99
 3/20/12 - OCZ Agility 3 120GB            - $139.99-$30 rebate = 109.99
 4/27/12 - Mushkin Enhanced Chronos 120GB - $ 99.99
 5/16/12 - OCZ Solid 3 60GB               - $ 74.99-$20 rebate =  54.99
 8/10/12 - Sandisk 128GB                  - $ 79.99
11/21/12 - Kingston HyperX 2K 240GB       - $149.99
 1/18/13 - Sandisk Extreme 120GB          - $ 89.99-$15 reward =  74.99
 1/18/13 - Sandisk Extreme 120GB          - $ 89.99-$15 reward =  74.99

But, during this time...I had the lhaven misstep Where I had picked up the 60GB drive for that, but ended up using the Mushkin 120GB drive instead. The OCZ Agility 3 120GB had gone in as OS drive for my Xen Cloud Experiment. And, stayed when I went on to making it FreeBSD. Cut up initially as 64k boot, 32GB swap, 16GB L2ARC for the mirrored 1.5TB drives to help with dedup...and the rest...63GB root zpool.

Somehow the Patriot got misplaced for a while, so it got overlooked during the chaos.

After a 'break'. I picked up the Sandisk 128GB drive. Thinking that it might be a better choice to use to finally replace the (u) laptop harddrive. Though I waited until after the NN conference in October to do it, but before I went to LISA in December. Though I didn't finally upgrade the the OS to 12.04 (from 10.04) until just last week. I had thought about doing a clean install to 64-bit....since there were some issues since I upgraded the memory to 8GB. But, changing the hibernate method seemed to have solved the issue....so decided to leave it 32-bit. Though my (w) laptop is 64-bit...though it only has 4GB. Not sure if I'll upgrade it to 8GB. Or when I'll upgrade its harddrive to SSD.

Things have been kind of tight since...on the 128GB Sandisk drive. partly because swap got a bit bigger...had suspected that 8GB swap was iffy for hibernation....so had bumped that up. Plus the original harddrive was 160GB. But, the lion share of space consumption is my Windows XP VM. But, it get's the job done.

Meanwhile...around this time I got the idea that instead of making the risky upgrade of my two Ubuntu servers from 10.04 to 12.04, that I would set up two new FreeBSD servers and migrate the essential services over before deciding the future of those systems. So, I acquired a pair of Shuttle XS36V's...4GB of memory for each...and then eventually the plan was to acquire a pair of SSDs for them. Which I finally did last week as a pair of SanDisk Extreme 120GB drives. (with the help of $30 from Best Buy Reward Zone....and this purchase should get me a $5 reward zone soon.) And, these will probably get installed as FreeBSD 9.1.

Pages: 1· 2

07/02/12

  04:29:00 pm, by The Dreamer   , 440 words  
Categories: Stuff, Healthcare

How to check your PD

Since I seem to have this problem recently, that seems to lead to unexplained damage to eyeglasses....I thought I should acquire some cheap spares. Like using offers that appear via deals.woot.com or such sites now and then.

But, I had a bad experience before, because my PD wasn't right.

Now, I had noticed that there was a different PD measurement listed on my prescriptions that I've been getting from Eyecare Associates....which are probably right, but I thought I should see if there was some way to check for myself.

Searching the Internet, I found these instructions.

Self measure PD in front of a mirror: you need a mirror and a MM ruler.

  • Stand with you face about 20 cm (8 inches) from the mirror.
  • Close your right eye and look only with your left eye.
  • Place a ruler flat against the mirror and align it horizontally with the millimeter scale pointing up.
  • Look over the top of the ruler and align the zero mark in the center of your left pupil.
  • Open your right eye and close the left, but do not move your face or the ruler.
  • Read the millimeter measurement corresponding to the center of your right pupil.
  • Repeat the procedure several times to make sure you have a consistent measurement.

But this is rather difficult....well, there's another procedure:

  1. Hold the mm ruler on the bridge of your nose for stability. Pretend you can look through the mirror (X-ray vision) to see the horizon far away. This keeps your eyes from rotating in toward your nose.
  2. Point your face [nose] straight into a mirror.

    --- CLOSE your left eye to avoid parallax error. ---
  3. Align the ruler's zero to the center of your right pupil. The pupil is the black spot in the middle of the eye.
  4. Without moving the ruler, close your right eye and open your left eye.
  5. Read the millimeter line under your left pupil (careful -- backwards in mirror!).

    --- Keep you face "square" to the mirror to avoid parallax error. ---
  6. Repeat two or three times to confirm accuracy.

Using this second procedure, seems to confirm the PD on record for my prescription from Eyecare Associates.

65mm.

That's kind of a big difference than the number entered at Lenscrafters (62mm). Probably explains why buying glasses from anywhere other than Lenscrafters had always been a disaster. Which they don't use in the store, rather marking PD locations on the demo lenses and making the pair from that....within an hour.

Time to see if a few $9 pairs will really work....well, they'll end up much more than that, because I'll add in things like anti-scratch, anti-glare, high-index and progressive....and maybe I'll tint one.

Now instead of subjecting some poor random forum to a long rambling thought, I will try to consolidate those things into this blog where they can be more easily ignored profess to be collected thoughts from my mind.

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