Data Written to SSD

I'm worried about the amount of data that is written to my drive. Activity monitor shows 4 gb after 12 hrs of idle time. Is this excessive? What exactly is getting written if i'm only browsing iwth safari and a few menial tasks?
I ask because I just installed a SSD and I'd like to reduce all this small file disk writing. I've already enabled noatime, turned off spotlight, and put the mbp in hibernate mode 0 so files don't get written to disk on battery failure.
I guess my broader question is what are the main data writing tasks in a system with just browsing, minimal downloading. Is it advisable to create a ram disk and put my cache files on it? If so what's the best way to create a ram disk on leopard?

To add....
when i fs_usage i get a whole bunch of safar wrdata rsync. like this:
21:33:44 WrData[async] 0.000293 W Safari
21:33:44 fsync 0.000350 W Safari
21:33:44 fsync 0.000003 Safari
21:33:44 close 0.000015 Safari
21:33:44 pwrite 0.000009 Safari
21:33:44 WrData[async] 0.000102 W Safari
21:33:44 fsync 0.000134 Safari
21:33:44 fcntl 0.000006 Safari
21:33:44 fcntl 0.000003 Safari
21:33:44 pwrite 0.000010 Safari
21:33:44 pwrite 0.000005 Safari
21:33:44 pwrite 0.000006 Safari
21:33:44 pwrite 0.000006 Safari
21:33:44 pwrite 0.000005 Safari
21:33:44 pwrite 0.000004 Safari
21:33:44 pwrite 0.000005 Safari
21:33:44 pwrite 0.000004 Safari
21:33:44 pwrite 0.000027 Safari
21:33:44 pwrite 0.000006 Safari
21:33:44 pwrite 0.000006 Safari
21:33:44 pwrite 0.000005 Safari
21:33:44 pwrite 0.000005 Safari
21:33:44 pwrite 0.000006 Safari
21:33:44 pwrite 0.000004 Safari
21:33:44 pwrite 0.000004 Safari
21:33:44 pwrite 0.000004 Safari
21:33:44 pwrite 0.000006 Safari
21:33:44 pwrite 0.000006 Safari
21:33:44 pwrite 0.000006 Safari
21:33:44 pwrite 0.000006 Safari
21:33:44 pwrite 0.000005 Safari
21:33:44 pwrite 0.000005 Safari
21:33:44 pwrite 0.000006 Safari
21:33:44 pwrite 0.000005 Safari
21:33:44 pwrite 0.000006 Safari
21:33:44 pwrite 0.000006 Safari
21:33:44 pwrite 0.000005 Safari
21:33:44 pwrite 0.000006 Safari
21:33:44 pwrite 0.000006 Safari
21:33:44 pwrite 0.000006 Safari
21:33:44 pwrite 0.000005 Safari
21:33:44 pwrite 0.000006 Safari
21:33:44 WrData[async] 0.000102 W Safari
21:33:44 WrData[async] 0.000102 W Safari
21:33:44 WrData[async] 0.000110 W Safari
21:33:44 WrData[async] 0.000114 W Safari
21:33:44 WrData[async] 0.000145 W Safari
21:33:44 WrData[async] 0.000140 W Safari
21:33:44 WrData[async] 0.000112 W Safari
21:33:44 WrData[async] 0.000102 W Safari
21:33:44 WrData[async] 0.000116 W Safari
21:33:44 WrData[async] 0.000140 W Safari
21:33:44 WrData[async] 0.000179 W Safari
21:33:44 WrData[async] 0.000239 W Safari
21:33:44 WrData[async] 0.000254 W Safari
21:33:44 WrData[async] 0.000202 W Safari
21:33:44 WrData[async] 0.000240 W Safari
21:33:44 WrData[async] 0.000232 W Safari
21:33:44 WrData[async] 0.000260 W Safari
21:33:44 WrData[async] 0.000252 W Safari
21:33:44 fsync 0.000648 Safari
21:33:44 close 0.000020 Safari
21:33:44 unlink /com.apple.Safari/Cache.db-journal 0.000153 Safari
21:33:44 fcntl 0.000004 Safari
21:33:44 fcntl 0.000003 Safari
21:33:44 fcntl 0.000003 Safari
21:33:44 stat y/Caches/com.apple.Safari/Cache.db 0.000010 Safari
21:33:44 read 22.197151 W fseventsd
21:33:44 lstat er/Library/Caches/com.apple.Safari 0.000050 fseventsd
21:33:44 getattrlist 0.000016 Finder
21:33:44 getattrlist er/Library/Caches/com.apple.Safari 0.000037 Finder
21:33:44 open ches/com.apple.Safari//Contents>>> 0.000062 Finder
21:33:44 access_extended er/Library/Caches/com.apple.Safari 0.000016 Finder
21:33:44 getattrlist er/Library/Caches/com.apple.Safari 0.000011 Finder
21:33:44 open er/Library/Caches/com.apple.Safari 0.000011 Finder
21:33:44 getdirentriesattr 0.000095 Finder
21:33:44 close 0.000008 Finder
21:33:44 ioctl 0.000201 configd
21:33:44 ioctl 0.000511 W configd
21:33:45 WrData 0.000277 W update
21:33:45 WrData 0.000686 W update
21:33:45 WrData 0.000101 W update
21:33:45 WrMeta[async] 0.000066 W update
21:33:45 WrMeta[async] 0.000091 W update
21:33:45 WrMeta[async] 0.000172 W update
21:33:45 WrMeta[async] 0.000125 W update
21:33:45 WrMeta[async] 0.000159 W update
21:33:45 WrMeta[async] 0.000164 W update
21:33:45 WrMeta[async] 0.000196 W update
21:33:45 WrMeta[async] 0.000207 W update
21:33:45 WrMeta[async] 0.000241 W update
21:33:45 WrMeta[async] 0.000251 W update
21:33:45 WrMeta[async] 0.000268 W update
21:33:45 sync

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Zero Out Data on a SSD drive: Are my findings correct?

"Note: With OS X Lion and an SSD drive, Secure Erase and Erasing Free Space are not available in Disk Utility. These options are not needed for an SSD drive because a standard erase makes it difficult to recover data from an SSD. For more security, consider turning on FileVault 2 encryption when you start using the SSD drive."
http://support.apple.com/kb/HT3680
Seems to hard to believe, as I've seen some of the top participants here clearly say that first your set a new partition, then erase Macintosh HD, then zero out data?

Retired Engineer, do you have any references? What I have read says otherwise.
Drive Wear & Tear
What is your estimation of wear and tear on the flash by writing to 0's. What percentage of the drives total usage has been "wasted"? I thought even consumer drives where capable of 1000 - 10000 rewrites per cell, whereas enterprise SSDs are capable of over 100,000: http://www.computerworld.com/s/article/9112065/Solid_state_disk_lackluster_for_l aptops_PCs?taxonomyId=19&pageNumber=1&taxonomyName=Storage.
"For one thing, it matters whether the SSD drive uses SLC or MLC memory. SLC generally endures up to 100,000 write cycles or writes per cell, while MLC can endure anywhere from 1,000 to 10,000 writes before it begins to fail, according to Fujitsu's Hagberg. For its part, Western Digital's laptop hard-disk drive boasts up to 600,000 write cycles."
That's an old artcile too. Slightly newer, in late 2008 Micron/Sun achieved SLC NAND chips capable of over 1,000,000 write cycles: http://investors.micron.com/releasedetail.cfm?ReleaseID=440650 . I imagine things have gotten slightly better in the last 4 years.
Data Wiping
This paper (http://static.usenix.org/events/fast11/tech/full_papers/Wei.pdf) states, "In most cases, overwriting the entire disk twice was sufﬁcient to sanitize the disk, regardless of the previous state of the drive."
Going on however, "Overall, the results for overwriting are poor: while overwriting appears to be effective in some cases across a wide range of drives, it is clearly not universally reliable. It seems unlikely that an individual or organization expending the effort to sanitize a device would be satisﬁed with this level of performance."
The best method I have found for wiping an SSD on a Mac is the (SAFE) Scramble and Finally Erase process as described in this UC San Diego research paper: http://cseweb.ucsd.edu/users/swanson/papers/TR-cs2011-0963-Safe.pdf.
According to their paper, the effectiveness of the procedure is equiavlent to degaussing a magentic drive. Another tidbit, the SAFE technique is replicated by Sandforce controller when someone reformats the drive (as mentioned by Linc Davis above, however, I believe this is specific only to Sandforce controllers).
References:
http://www.schneier.com/blog/archives/2011/03/erasing_data_fr.html
http://www.computerworld.com/s/article/9211519/Can_data_stored_on_an_SSD_be_secu red_
http://arstechnica.com/security/2011/03/ask-ars-how-can-i-safely-erase-the-data- from-my-ssd-drive/
http://static.usenix.org/events/fast11/tech/full_papers/Wei.pdf
http://cseweb.ucsd.edu/users/swanson/papers/TR-cs2011-0963-Safe.pdf

Java.io.IOException: There is no process to read data written to a pipe.

Hi all
I am facing a problem when i run my application
I am using jdk1.3 and Tomcat 4.0.3
Actually my application works absolutely fine but when i check the
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What i dont get is in the entire stack trace i am not able to locate which of my application files is causing the errors
I searched on net and found a few root causes but i am not able to find out exactly which class file is causing the stack trace
Any suggestions are most welcome
Thanking in advance

Did you do something strange like writing the object out using the Servlet response's output stream and then attempted to redirect or forward a user to another page? That is usually how the IllegalStateException gets generated. You would still see a valid response from the caller's perspective, but since you attempted to forward or redirect after data has already been written to the stream on the server, an exception is thrown there.
- Saish

There is no process to read data written to a pipe

Hi
I have an application server and a database server. I have a process that is running on the application server - that is processing records in a huge file - 2.41 GB. This file contains 20 million records. The process reads and processes one record at a time. For each record, the process reads the record, goes to the database to search for a match, does not find it - since on purpose we have created the test bed to not match, and then it updates the bookmark in one of the database tables and moves on the next record.
The process runs fine for 86399 seconds and then it throws the 'java.sql.exception Io exception There is no process to read data written to a pipe'.
Note that in this 86399 seconds, it process 11934696 records.

It is important to undertand, why do I have to create
the connection. If the connection has already been
established and is in use, why after processing
nearly 11.9 million records, I need to close the
connection and create a new one.It might be important to you but it isn't important to me.
When I work I work towards a solution and not understanding. So if closing the connection and re-opening every 100,000 records solves it then that is what I would do. I would do it knowing that something in the driver or the database is preventing me from solving it without doing that and also knowing that I am not going to be able to fix either the driver or the database and I don't have time to wait for those fixes.
Not to mention that if it was taking an entire day to run anyways then I would consider closing and opening a connection a very minor part of what would be a much bigger problem.
>
In this particular case my java program is reading a
record from a file and extracting certain fields in
that file record. Based on those fields it is looking
for a match in the database. It is the same code,
having application and business logic to take a
different path if a match is found in the database. .....and again I can only wonder how much faster it would be if you did it in the database. I would suspect at least an order of magnitude.
>
I guess the issue here is not java vs Database. The
issue is what causes this exception in my test
scenario.So you are looking for a reason and not a solution? Then it should be simple enough to create a small test app, reproduce the bug and then file a bug report with the vendor. Then wait for between 6 weeks and 2 years for an answer. Maybe. Because they might never respond.
Or disassemble the driver and debug it. And since I consider it unlikely that the problem is in the java code you will also need a cpu op code reference and a debugger that can debug the database itself. Then just start running it and step through the instructions to figure it out.

Io exception: There is no process to read data written to a pipe.

Hi there,
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Servlet request terminated with IOException:java.io.IOException: There is no process to read data written to a pipe.

Hi,
I am getting this following error. Could anyone please throw some light.
Thanks
Nilesh
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I forgot to mention.
I am using Weblogic 5.1 with SP 9
Nilesh
"Nilesh Shah" <[email protected]> wrote:
>
Hi,
I am getting this following error. Could anyone please throw some light.
Thanks
Nilesh
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Hi guys!
I get this error and have no idea, where it comes from..
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Olian

Olian,
You can also do the same process as mentioned in the weblog:
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Regards,
---Satish

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Hello all!
I'm perplexed!
I exported a 30 second clip from Adobe Premiere CS5.5 (via AME) using the Mpeg-2 DVD setting/preset. I imported the video file as a timeline into Adobe Encore, and imported the .wav file as an asset. No menus, as this was a "first play" test.
When it was time to build the project, the "bytes used" read 19.5MB. However, once the build finished, the "data written" read 550MB. This concerns me.
Q1 - Why is there such vast difference in size between the bytes used and the data written?
Q2 - My official project is nearly 2 hours. When I load it up, I'm sure "bytes used" will be multiple GB's, which is fine because I'm using a double layered DVD. However, my concern is that the data written will be gigantic! Am I assuming correctly?
IF I'm right, there is a problem. As we know, the DVD won't burn beyond the space allowed. How is it possible that Encore says there is enough space with bytes used, but the data written FAR exceeds the capacity of the DVD?
The reason I did the 30 second clip is because my first 3 attempts to burn the DVD have failed. Adobe Encore freezes and won't finish, EVENTHOUGH there was enough space on the DVD according to "bytes used". I ASSUME it's because the data WRITTEN exceeds the available space.
Is this making sense? Has anyone encountered this or have any suggestions? Do I need to provie anymore information to help assess the situation?

3 things
1 - I don't remember the exact number, but there is some "overhead" written to the DVD (navigation commands to the player ???)
2 - check to be sure you did not put an entry in the ROM space, to write computer files to the DVD
3 - I don't have a link, but I "think" I remember a really old discussion that there is a minimum amount that may be written to a DVD for it to work in a standalone player, and that Endore will "pad" the write if there is not enough data
As far as Encore freezing... do the below as a test
Create a DVD output ISO file and then use the FREE http://www.imgburn.com/index.php?act=download to write the ISO to DVD (send the author a PayPal donation if you like his program)
Read http://forums.adobe.com/thread/1322583 for notes on installing Imgburn WITHOUT any toolbar add-ons
When you write to disc with Imgburn, use the SLOWEST possible speed setting, so your burner has the best chance to create "good, well formed" laser burn holes... since no DVD player is required to read a burned disc, having a "good" one from a high quality blank will help
Use Taiyo Yuden single layer or Verbatim Two layer Or Falcon Pro for inkjet printable Two layer

DPM 2012 Reporting 9.2Tb Data Written to an LTO6 Tape.

I understood the "Data Written" to be the total amount of data written to the tape, so how can my LTO6 be reporting 9,201,199.88 Mb !
LTO6 Tapes are 2.5Tb Native & 6Tb compressed.
Can anyone explain this ?

Hi,
LTO-6 advertises a capacity of 6.25 TB (assuming a 2.5:1 compression), if the data you are backing up is highly compressible, you can get more data on the tape.
Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread. Regards, Mike J. [MSFT]
This posting is provided "AS IS" with no warranties, and confers no rights.

The "write key" configuration file vi use of "trim string" prior to writing the data can modify any string data written.

I tried to use the config VIs to record some front-panel settings for later restoration, one of which could be a single space character (part of a string parsing system).
I soon discovered that whenever I tried to save that single-space value to an INI file, only a null string was saved.
After doing some digging I discovered that buried in the Write Key vi is a worker vi called Config Data Modify that uses Trim String on the string data before it is written to the file and that's what was eating my string character. I don't know whether this is a bug or a feature but there are at least three ways to fix it.
1) Assuming you want to leave the library VIs alone, you can pre-process any stings sent to "write key" to replace all spaces with "\20" and then post-process all strings read using "read key" to replace all instances of \20 with spaces.
and if you don't mind modifying the library VIs, either to save/use under a different name or to stick back into the library in a modified state (caution - can cause problems when you move code to another machine with an un-modified library) then...
2) You can yank the trim-string out of the Config Data Modify vi and hope that it does not have any undesirable side effects with regards to the other routines that use Config Data Modify (so far I have not found any in my limited testing)
or
3) You can modify the string pre-processing vi, Remove Unprintable Chars, to add the space character to the list of characters that get swapped out automatically.
Note that both option #1 (as suggested above) and option #3 will produce an INI file data entry that looks like key="\20Hello\20World\20" while option #2 produces an entry that looks like key=" Hello World "
The attached PDF contains screenshots of all this.
Attachments:
Binder1.pdf ‏2507 KB

Hi Warren,
there's a 4th option:
Simply set the "write raw string" input of the write key function to TRUE
This option only appears when a string is wired to that function!
Just re-checked:
I think it's a limitation of the config file format. It's text based and (leading) spaces in the value are "overseen" as whitespaces. So your next option would be to use quotes around your string with spaces...
Message Edited by GerdW on 05-02-2009 08:32 PM
Best regards,
GerdW
CLAD, using 2009SP1 + LV2011SP1 + LV2014SP1 on WinXP+Win7+cRIO
Kudos are welcome

Data Written to SSD

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