Trying to understand low SSD lifetime

Hi. I’ve been using an OCZ Onyx SSD for two years and today had a look at its SMART values. I’m told the disk has already reached half of its lifetime:
205 Max_PE_Count_Spec 0x0000 --- --- --- Old_age Offline - 5000
206 Min_Erase_Count 0x0000 --- --- --- Old_age Offline - 792
207 Max_Erase_Count 0x0000 --- --- --- Old_age Offline - 3838
208 Average_Erase_Count 0x0000 --- --- --- Old_age Offline - 2513
209 Remaining_Lifetime_Perc 0x0000 --- --- --- Old_age Offline - 50
This seems wrong because:
User Capacity: 64,023,257,088 bytes [64.0 GB]
Sector Size: 512 bytes logical/physical
199 Write_Sectors_Tot_Ct 0x0000 --- --- --- Old_age Offline - 1881433528
According to these values 1881433528*512 = 963293966336 bytes have been written to the disk (963 GB).
According to OCZ (pdf) the formula to measure the amount of data that can be written to an SSD is: DriveSize * PECycles / WriteAmplification, and the worst possible write amplification is 17.
For my disk that makes: 64 GB * 5000 / 17 = 18823 GB.
Which would give a remaining lifetime of: 100 - 100 * 963 / 18823 = 94%!
And we’re talking of a worst case scenario here.
So what is wrong?
The 963 GB of data written to the disk corresponds to about 1.3 GB per day, which seems plausible since I’ve taken care not to write too much on the SSD. I still have pacman’s cache on the SSD, but not Firefox’ cache. I remember using iotop to measure my disk usage and finding that it was low enough (though maybe I didn’t measure disk writes during an update… I don’t remember that.)
I’m using LVM and its snapshot feature (every time I backup&update arch, and the snapshot is removed after the backup is done) but without encryption. Filesystem is ext4 with options discard, noatime, commit=60. There is no swap partition.
My SSD has firmware 1.6 and I see that 1.7 has a fix for a bug that could possibly cause extra wear, but they don’t say how much:
- Enhancement: Change of the behavior of meta data save. With 1.6 FW, there could be such cases that will save the whole meta data even when it is not necessary, for example, during idle time. It depends on usage. Now, the policy of saving meta data is fine-tuned
- Bug fix: Sanitary erase may corrupt write log history. It was fixed.
Can someone see what is going on?
Last edited by stqn (2013-02-08 14:51:43)

blackout23 wrote:
graysky wrote:
blackout23 wrote:OCZ has a very bad reputation for SSDs in general
Maybe true with older generation models, but the Vertex 4 is a great product.
Yes it uses a new controller, too. They learned a bit there. Haven't heard of any common problems with it.
Still as a company they lost a lot of reputation will take them a long time to regain it.
Ah yes, this brings back memories...
Lost all data on home partition, would really appreciate advice
It's a bit irrational, but i am still hesitant to buy an OCZ ssd again, some 5 years later...

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Hello, Experts!
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<mx:Module xmlns:mx="http://www.adobe.com/2006/mxml" implements="acrobat.collection.INavigator" height="100%" width="100%" horizontalScrollPolicy="off" verticalScrollPolicy="off" >
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Trying to understand Android OS updates delays

This is not another hate mail, it´s more about trying to understand the facts and motives regarding the OS updates (or lack of).
Hopefully this material will arrive at someone from Sony with enough power to do something about it.
Ever since I can remember, Sony has been THE brand for electronics. I can´t remember a TV or VCR in my house that it wasn´t Sony, and they lasted for LOTS of years.
When a couple years ago I finally had the money (and the need) for a Smartphone, i chose the X10 Mini, which is a great little phone from a great brand, but it´s stuck at Android 2.1... which makes it a crippled android nowadays...
It really bothered me the lack of OS updates, so I chose to buy a Galaxy Nexus, but it´s really expensive in my country. So my second option was a Galaxy Ace 2, but they haven´t arrived to my country yet, so I went with my third option: Xperia Sola, knowing beforehand that it´s a great phone, a great brand, but I might get slow OS updates.
I bought it about 10 days ago when I saw they were starting to roll out the updates.
10 days later I still don´t have my update. And not only that, but I don´t see much light at the end of the tunnel...
I found a thread with the SI numbers that were updated, and there were a bunch on Oct 1, another bunch on Oct 4, and one code on Oct 8, and no other update since...
I also read that those who did get the update, were having bugs with the OS, and also found threads from other Xperia models, whose updates began rolling 3 months ago, and there is still people who hasn´t gotten the update...
As a customer, and a owner/CEO of a small company, I have a really hard time understanding how a HUGE company like Sony can be making such mistakes...
I have been thinking objective reasons, and I can only think of one. I know it´s a wild guess, but I´m starting to think that our salvation might be the very thing that means our condemnation: CYANOGENMOD!!!
Think about it: Why would Sony spend more money hiring twice as much programmers, when they can make only one update per phone, and sit down and see how CM releases begin to appear, for all tastes and needs. And... IT´s FREE!!!
Also, if there is a software related problem (way more likely than a hardware problem), then the CM developers take the fall, instead of Sony. And I´m beginning to see custom OS installers that are more user friendly, so it might be something that they take in accout when neglecting OS updates.
If that´s the line Sony is following, it´s a very risky move and it won´t work. Sony Mobile will crash and burn, but it´s still a better business plan that "let´s get lazy and make ULTRA slow updates so we don´t spend a lot of money programming".
If you can´t afford more programmers, stop including so much bells and whistles and make your OS near vanilla. Include a couple of Xperia menus, a custom theme and voila!
The main reason I wanted the Galaxy Nexus is Vanilla OS, which means inmediate OS updates. Sony on the other hand, takes a year or two to release it after its launch. If they release it at all...
Another though... why not stop making that many different phones! Really! There are like 5 Xperia models i can´t tell one from the other... even with specs side by side!
You are trying to make too many phones and you are failing with all of them! (Software and software updates are also part of the phone, one of the most importants...)
I know hiring programmers is expensive, but you are sacrificing one of the most expensive values for a company EVER: Customer credibility! Which as you know better than me, takes years to create.
If Apple had problems with carriers and code aprooving and stuff, they might get away with it, becouse they alone have all the devices. If iOS 6 is delayed a few months, it´s delayed for everyone, and besides Apple fanboys rarely complain about Mac products, but Android is a more independent and educated market.
I´m not saying that Apple users are ignorant, not at all, but I´m pretty sure most iPhone owners don´t even know what processor or how much RAM their phone has. They just "swallow" the Apple Way of Life. (it´s a good phone becouse Apple says so).
The Android user on the other side, because of the fragmentation of the market, has many brands and models to choose from. An Android user about to buy a new phone will most likely go online looking for different models, specs, reviews in webs and forums...etc.
You can´t say "I don´t know how HTC and other companies get their updates so soon, but we take a lot more becouse Google and the Operators must aproove the code.", because there are many other brands that have exactly the same difficulties or more, since they are smaller, and we can SEE online that they are indeed delivering solid and relativly fast updates.
Did we miss something? Does HTC use Witchcraft to get their code aprooved?
My underlying point is this: You are getting lazy... VERY lazy with software programming for your phones, and WE KNOW IT!
It´s not the "difficulties" you claim, becouse every brand has those difficulties.
This isn´t 1999 you know. We are in the information age. If you lie to us and tell us that your phones have the latest OS, I can go online and see that you don´t (Hello!!!). If I see that the company lies to it´s customers, I will stop buying their products. If I´m so dissapointed with how Sony handles OS updates and their customers queries about it, then I want for the first time ever to sell my Cell Phone becouse I´m not happy with it, or the brand behind it.
We also live in the "Here and now" age. You can´t expect your customers to read about new Android releases on news and blogs, and wait YEARS with arms crossed waiting for their update... The world doesn´t work like that. Not anymore at least...
It´s not a matter of how many recources you have, it´s about how you use and balance them. GIVE MORE IMPORTANCE TO SOFTWARE UPDATES! IT´S WAY MORE IMPORTANT THAT YOU THINK! LISTEN TO YOUR CUSTOMERS!!!
You guys are Sony are smart and design great products, but you are not GOD! You are not our wife, no one has sworn alliagence to you.
If you stop giving us good products and start lying to us, we hate you and stop giving you our money. Simple as that.
My sola is beatiful, I love the design, the screen, the hardware... but it hasn´t been updated yet to 4.0, not to mention 4.1, which REALLY is the latest version... so stop advertising that your phones have the latest Android OS, unless you want angry customers switching to other companies, which you are getting.
I also read some stories that Androind 4.0 was announced for the Xperia PLAY, and then it was called off... Do you have any idea how pissed I would be and ripped off I would be if I bought my phone based in that information and then you say it won´t be available?
Well, actually right now my possition is worse, since you SAY you will update my phone, but you don´t say when, and I read online about people still not getting their updates months after the rollout started, so I´m in the limbo right now...
As a company, one of the worse things you can do is calling your customers stupid, and when I see the answers you give in this forum, then I feel insulted. I feel like they are talking to an idiot or ignorant person with the so called "diplomatic" answers, which are basicly empty excuses for not doing your job right.
You gave us the frikking CDs, DVDs and Blu-Rays!!! Don´t tell us you can´t tweak an already built OS in a year!
I really hope you change their OS update policies really soon, before you lose the already small cellphone market share you have, or at least change your P.R. and C.M. policies towards a more open one.
We all are humans and make mistakes, but we customers really appreciate honesty and truth.
Have an open conversation with your customers! Don´t lie about your shortcomings! Accept then and ask the community to help you solve them, ask them what they biggest problems are, what features are most important to them, how often do they expect updates... LISTEN TO THEM!!
"Succes is a meneace. It tricks smart people into thinking they can´t lose."
Ps: Nothing personal with the mods from this forum, I´m not killing the messenger, I know that you can ONLY give the info you are allowed to give, and even if you wanted, you probably don´t know the answers yourself, since you work in the Communications department, not Developement or anything technical, and if you can't give any given info, then they probably won´t give it to you either... My message is to the company as a whole. I just hope you will be a good messenger and give this to whoever needs to read it.

My bad, it´s closer to 40 the number of phones released hehe
I know it´s all about money, and I know Sony is obligated to neglect users who haven´t given them money after an x ammount of time. However, it´s not a matter of making the phones obsolete earlier, so the users want to buy a new phone faster and therefore getting more money.
A person will buy a new phone when he/she has the money to do so and wants to do so.
It´s not a matter of WHEN. It´s a matter of WHAT.
The question is not "When will that user buy a new phone?", but rather "When that user buys a new phone, whenever that is, what phone will it be?"
I have a love/hate relationship with Apple. I would never use a iPhone. I would love having any Mac, if someone gives it to me, but I would never spend my harn earned dollars on such an overpriced piece of hardware over general principals.
However, i do recognice that Steve Jobs was a business genius. Weather you like or love his ideas and methods, he turned a garage project into the biggest company in the world, with a market value higher than Exxon with 1/3 of it´s assets.
Apple is a money making machine, and that is where the "hate" part of my relationship comes from.
However, it surprised me a lot to see that they released iOS 6 for the iPhone 3GS, released in 2008!
That get´s you thinking, that inside all that "SELL NOW" culture Apple is, they also support their older devices that people bought years ago but can't buy a new phone now. However, when they can do it, it will surely be another iPhone. Because they FEEL that the company listens and cares for them.
Also if you jump from iOS 6 on the 3 GS to a brand new iPhone 5, the transition will be virtually non-existant, except for Siri and a couple of features.
However jumping from Android 1.5 or 2.1 to Jelly Bean, might not be so easy on some users, making them more likely to give iPhone a shot.
Since they have to adapt to another phone anyway, they might as well try the apple...
And for old users, it gives people a sense of continuity and care about the user. Otherwise we feel like being kicked out of a restaurant right after we payed the bill.

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Hello All,
I am pretty new to OIM, just trying to understand how OIM works. For the past 4 years I was in Sun IdM and planning to switch over to OIM.
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Thanks in advance.

Sun IdM uses Express language to develop custom workflows or forms, in OIM to develop workflows which language did you use, is it Java or any other language?
- JAVA
If I want to provision users on AS/400, HP Open VMS or AIX systems, how can I do that I don't see any out of box connectors for these resources, so in order to integrate these resources do we need to write our own custom connectors?
- If OOTB connectors are not available then you'll have build you own connector as per Target Resource.
If the out of box connector does not support a specific function on a resource what are the options do we have?
- You'll have customize their connector as per your requirements or write your own
How much Java coding is necessary in OIM?
- We can't calculate how much java. It's totally depends on requirements how much code you'll ahve to write. But everything will be done using Java only.
- Is OIM supports role based provisioning?
Here Group represent Role. At a small scale it supports. But for large scale you'll have to use Oracle Role Manager as you do in Sun Role Manager.

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- sometimes photoshop will just save the picture, and it's done
- sometimes photoshop will show me the compression dialog, "JPEG Options", in which I can choose the compression ratio, the format options (baseline, baseline optimized, progressive), and have an estimation of the total file size
While not being prompted any dialog is simpler, and I'll then simply assume Photoshop decides to retain the current image's compression and format rules, I must say I like to be in control, and I'd like to know under what form the file is being saved without having to resort to the much more complex "Save For Web" menu.
Please, would you know WHAT "triggers" the appearance of the JPEG Options when we close/save a jpeg file, in photoshop ? What makes this menu not to appear, what makes it appear ?
If there are trivial file operations/changes/filters that necessarily trigger its appearance when we want to save, something like that ? I've tried a variety of these, but I still can't figure it out, sometimes it shows in the end, and sometimes it doesn't.
Thank you very much if you can help me
Kind regards,
Oliver

@ c.pfaffenbichler
These are images from various sources, not just one.
I'm deliberately excluding Save For Web, this completely re-processes everything.
My purpose, precisely, is to know when photoshop takes the decision to retain the image's "rules", and when photoshop decides to pose us the question, how do we want it saved.
Simply taking a jpeg image, doing stuff on it, and hitting control-w to close the window, and seeing if it will be an
- «OK, sure, do you want to save ? You clicked OK to confirm you wanted the changes saved ? Good, now it's closed» or a
- «please sir, how would you like your image saved, tell me the compression ratio and the format options, thank you»

UTL_HTTP.end_of_body Exception Error. Trying to Understand the Reason Why?

I have the following PLSQL Function that returns a End_of_body Error. This started when we migrated from 10g to 11g. It is simple enough to capture so the error does not stop the Function Flow, but the error causes the OCI driver in OBIEE to error, which prevents the use of OBIEE IBOT to execute. Trying to understand why this error is occurring..not sure if we have a permissions issue on the UTL_HTTP Package or what?
Anyone seen this problem in 11g? Suggests on resolving would be great. Thanks.
FUNCTION AA_DEMO_PO_WSDL(IN_MESSAGE IN VARCHAR2)
RETURN VARCHAR IS
soap_request varchar2(30000);
soap_respond varchar2(30000);
http_req utl_http.req;
http_resp utl_http.resp;
launch_url varchar2(240) ;
o_message varchar2(240) ;
po_amount number := 2000 ;
total_calls number := 0;
cursor c_PO_exists is Cursor Logic..
begin
total_calls := 0;
For po_wsdl in c_PO_exists
LOOP
total_calls := total_calls + 1;
soap_request:='<?xml version="1.0" encoding="UTF-8"?>
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
<soap:Header/>
<soap:Body xmlns:ns1="http://xmlns.oracle.com/PurchaseOrder_Approval">
<ns1:ProcessRequest><ns1:input>PO' || po_wsdl.order_no || '</ns1:input></ns1:ProcessRequest>
</soap:Body>
</soap:Envelope>';
Begin
http_req:= utl_http.begin_request('myURL/PurchaseOrder_Approval/1.0','POST','HTTP/1.1');
utl_http.set_header(http_req, 'Content-Type', 'text/xml') ;
utl_http.set_header(http_req, 'Content-Length', length(soap_request)) ;
utl_http.set_header(http_req, 'SOAPAction', 'initiate');
utl_http.write_text(http_req, soap_request) ;
http_resp:= utl_http.get_response(http_req) ;
utl_http.read_text(http_resp, soap_respond) ;
utl_http.end_response(http_resp) ;
Exception
WHEN UTL_HTTP.end_of_body THEN
utl_http.end_response(http_resp);
When utl_http.too_many_requests then
utl_http.end_response(http_resp);
o_message := 'End_Reponse' || ' from proc.';
when OTHERS then
o_message := SQLERRM || ' from proc.';
return o_message;
end;
END LOOP;
Return 'Workflow Initiated-' ||to_char(total_calls);
end AA_DEMO_PO_WSDL;

Hi, thanks,
it is oracle10g,
The Exception is : ORA-29266: end-of-body reached
ORA-06512: at "SYS.UTL_HTTP", line 1349
then the line in my function ,
damorgan wrote:
But I do note that when I do this I always do a get_header_count and get_header before get_read.what get_read , u mean?
thanks for the link ,
appreciated

I am trying to understand the licensing procedures for using tabKiller for 3.5.7 firefox. Who should I contact for this? I do not see any customer service phone number for Firefox

I am trying to understand the licensing procedures for using tabKiller for 3.5.7 firefox. Who should I contact for this? I do not have the customer service phone number for Firefox

Tab Killer is not created by Mozilla, it is created by a private individual who has made it available at no cost for other people to use.

[SOLVED] Trying to understand the "size on disk" concept

Hi all,
I was trying to understand the difference between "size" and "size on disk".
A google search gave plenty of results and I thought I got a clear idea about
it.. All data is stored in small chunks of a fixed size depending on the
filesystem and the last chunk is going to have some wasted space which
will *have* to be allocated.. Thus the extra space on disk.
However I'm still confused.. When I look at my home folder, the size on disk
is more than 320 GB, where as my partition is actually less than 80 GB, so
I guess I'm missing something.. Could somebody explain to me what does
320 GB of 'size on disk' means?
Thanks a lot in advance..
Last edited by geo909 (2011-12-15 23:17:25)

Hi all,
Thank you for your replies.. My file manager is indeed pcman fm and
indeed it seems to be an issue.. In b4data's link the last post reads:
B-Con wrote:
FWIW, I found the problem. (This bug is still persistent in v0.9.9.)
My (new) PCManFM bug report is here: http://sourceforge.net/tracker/index.ph … tid=801864
I submitted a potential patch here: http://sourceforge.net/tracker/?func=de … tid=801866
Bottom line is that the file's block size and block count data from the file's inode wasn't being interpreted and used properly. The bug is in PCManFM, not any dependent libraries. Details are in the bug report.
Since PCManFM is highly used by the Arch community, I figured I should post an update here so that there's some record of it in our community. Hopefully this gets addressed by the developer(s) relatively soon. :-)
I guess that pretty much explains things.. And I think I did understand the 'size on disk' concept
anyway
Thanks again!
Last edited by geo909 (2011-12-15 23:17:10)

Trying to understand the sound system

Here's my problem. My mic didn't work (neither the front mic nor the line-in in the rear), so after some research and trial and error I found that if I do
modprobe soundcore
my mic works on both the jacks
But here's where my confusion lies. This is the output of lsmod |grep snd before probing explicitly for soundcore
[inxs ~ ]$ lsmod |grep snd
snd_hda_codec_analog 78696 1
snd_hda_intel 22122 1
snd_hda_codec 77927 2 snd_hda_codec_analog,snd_hda_intel
snd_hwdep 6325 1 snd_hda_codec
snd_pcm_oss 38818 0
snd_pcm 73856 3 snd_hda_intel,snd_hda_codec,snd_pcm_oss
snd_timer 19416 1 snd_pcm
snd_page_alloc 7121 2 snd_hda_intel,snd_pcm
snd_mixer_oss 15275 2 snd_pcm_oss
snd 57786 8 snd_hda_codec_analog,snd_hda_intel,snd_hda_codec,snd_hwdep,snd_pcm_oss,snd_pcm,snd_timer,snd_mixer_oss
soundcore 6146 2 snd
[inxs ~ ]$
So as you can see, soundcore's already loaded, so why do I have to explicitly load it again to get the mic to work?
Once I add soundcore to my MODULES array and reboot, the lsmod output is also the same as above.
So my question is -- what does the explicit loading of soundcore do, that is not done by auto-loading of that module?

Oh... since your topic is Trying to understand the sound system, that puts you (and me) inside the whole world's population... chuckle. But I thought I'd pass along a document written by probably "The" main ALSA developer that I totally stumbled across just 3 days ago.
Go here:
http://kernel.org/pub/linux/kernel/people/tiwai/docs/
and download the flavor of your choice of the "HD-Audio" document, or simply view it online. It documents the deepest dive into the current ALSA snd_hda_* layers and issues that I've found to date (but still leaves me wanting).
Why that document isn't plastered across the interwebs is beyond me. I only get 11 hits when I search for it... such are the secrets of the ALSA world I guess.
Last edited by pigiron (2011-08-26 18:26:48)

Trying to understand low SSD lifetime

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