Question about "fast fsck", ext4 and defragmentation status [SOLVED]

I'm trying to use fsck to do a defacto defragmentation check of an ext4 partition. I'm running fsck from a live cd (SysRescue 1.15) to check one of my ext4 partitions. The ext4 partition is unmounted, of course.
The check goes amazingly fast, but it doesn't give me any info about the percentage of non-contiguous inodes, which I understand to be the the same as the percentage of defragmentation (true?). I'm thinking this is because of the new "fast fsck" feature of ext4, as detailed below.
My question: can I force a "slow fsck" in order to get a complete check including the inode-contiguity info? Or is there another way to get at the defragmentation status using fsck?
Thanks.
FWIW, here's the info on "fast fsck" from the excellent http://kernelnewbies.org/Ext4 page:
2.7. Fast fsck
Fsck is a very slow operation, especially the first step: checking all the inodes in the file system. In Ext4, at the end of each group's inode table will be stored a list of unused inodes (with a checksum, for safety), so fsck will not check those inodes. The result is that total fsck time improves from 2 to 20 times, depending on the number of used inodes (http://kerneltrap.org/Linux/Improving_f … ds_in_Ext4). It must be noticed that it's fsck, and not Ext4, who will build the list of unused inodes. This means that you must run fsck to get the list of unused inodes built, and only the next fsck run will be faster (you need to pass a fsck in order to convert a Ext3 filesystem to Ext4 anyway). There's also a feature that takes part in this fsck speed up - "flexible block groups" - that also speeds up filesystem operations.
Last edited by dhave (2009-02-17 22:09:49)

Ranguvar wrote:
Woot! http://fly.isti.cnr.it/cgi-bin/dwww/usr … z?type=man
fsck.ext4 -E fragcheck /dev/foo
Thanks, Ranguvar. I had read the man page for fsck.ext3, but I hadn't run across the page for fsck.ext4. The link was helpful.

Similar Messages

A question about Droid pre-order and contract status

Hi,
I preorded the droid from best buy the first day preorders were available. The person who handled my order didn't mention problems with my current contract status. My 2yr contract isn't up till 4/2010, and from reading here, it seems that best buy doesn't do the 1yr early upgrades.
So when I go down to best buy on friday to attempt to pick up my phone what are gonna be my options?
$599 retail price, or nothing? And so, will they refund my $50?
Would they do the 1yr and $369 price, if they consider I put in over one year on my current contract and consider it a $1yr? (I read someone say this would be an option)
Solved!
Go to Solution.

Who does best buy sell phones to if they don't offer upgrades? Just new customers and people with expired accounts?
Can someone explain this post to me? http://www.howardforums.com/showpost.php?p=13177342&postcount=32
According to the guy that posted that, he was orginally denied, like has been said here. but then the looked it up and told him they'd honor the 1yr early upgrade.
To me, it just doesn't make much sense to not honor what verizon does.. cause you'd be losing lots of business. Anyone who is up for NE2, and denied honoring it by BB will just go to the verizon store, or order it online via verizons website. Anyone 1 year into their 2 year contract who is denied the 1yr early upgrade that verizon offers, and who doesn't care much about waiting for their $100-$50 NE2 discount will again be forced to buy elsewhere cause BB turns them away.
I'm not trying to make threats that BB needs to change. Just trying to draw attention to something that makes no sense to lots of customers. And would like someone to actually look into this again, since it seems to vary from store to store, clerk to clerk.

HT201263 What will i do?screenshot There is a problem with your iPhone. Please visit the Service Answer Center to find answers to all your questions about service options, warranty and other processes in your country. To find your nearest Apple Store, cli

What will i do? ITune screenshot is as follows >
There is a problem with your iPhone. Please visit the Service Answer Center to find answers to all your questions about service options, warranty and other processes in your country. To find your nearest Apple Store, click here.

Do what it said to do.
"Please visit the Service Answer Center to find answers to all your questions about service options, warranty and other processes in your country. "

TS1814 There is a problem with your iPhone. Please visit the Service Answer Center to find answers to all your questions about service options, warranty and other processes in your country. To find your nearest Apple Store, click here.

There is a problem with your iPhone.
Please visit the Service Answer Center to find answers to all your questions about service options, warranty and other processes in your country.
To find your nearest Apple Store, click here.
Please help me i can aktivate my phone imei 012423006333181.

There is a problem with your iPhone.
Please visit the Service Answer Center to find answers to all your questions about service options, warranty and other processes in your country.
To find your nearest Apple Store
no imei also

Some questions about Unity 4.0 and IPC

I have a couple of questions and I was looking for "real world" answers, not specific answers from the design guide.
1.What is this bandwidth requirement between Exchange and Unity and what is it used for?
2. What sort of issues would we experience if we placed the Unity UM Server at the Colo and placed the Exchange server at the customer premise; with a single T1 between the sites?
3.What else is involved with a Unity UM install vs. a Unity VM install?
4.Does the Unity UM and Exchange servers have to be running AD?
5. Can Unity or the Exchange box be the Domain Controller? Or does it need to be a separate server?
6. Where does a vm message get streamed from? The Unity server or the Exchange server?

No you do not pay for FaceTime. It uses your WiFi network, so if you have access to WiFi it is free.
There is no server required for FaceTime, it will use a direct device to device protocol.
I can't answer the question about using phones in different countries as that will depend on if you buy a phone that is locked to a carrier.
If you buy a phone in Germany and it is locked to a German phone network then it will most likely not work with a SIM from Turkey. You would need to buy an unlocked phone which are very expensive as they do not have any carrier subsidy applied to the price.

Question about using 10g/11g and APEX ...

Hi,
I just recently learned of Oracle's APEX and have a few questions about using it.
Can I use APEX with express, standard, and enterprise editions of 10g and 11g?
Are all of these free to use?

You might want to read about APEX rather than jumping into questions that are reasonably well documented. Info at http://www.oracle.com/technology/products/database/application_express/index.html
Your specific questions:
1) Apex is a package that can be installed into any properly licensed database.
2) The price for the production license of the database varies by edition.
The price for Express Edition is $0 for use in production. Part of the cost for that edition is 'no Oracle Support based support, no patches, data volume limitation, etc.'

Questions about JVC GZ HD7 and Final Cut

i'm planning to buy a JVC GZ HD7, but i have some questions about it...
My imac configuration is
Imac 20" late 2006
1 Gb Ram
Leopard 10.5.2
Final Cut Studio 2
Ok
So my questions are:
1- When shooting the best setting for me is the 1440cbr, or 1920x1080
is better? i would like to have progressive instead of interlaced
moviefiles, but for what i have read the JVC HD7 only shoots interlaced...is possible to turn them into progressive after working in final cut?
2- In Final Cut Pro what are the sequence settings and the video
settings for a video shoot from this camera?
I would like to know the best settings possible for me,
regarding that i would like to edit in real time, no rendering needed,
and to have the best image quality that this camera can offer...

FCE is designed to work with DV/HDV files. It cannot work natively with MPEG2 files. You will need something like MPEG Streamclip to convert your files to a format that FCE understands
Streamclip is free but you need to buy Apple's MPEG Playback Component to make it work

Techie Question about iWeb, outbound links, and Google Analytics

Hi,
I have a kind of pretty technical question about using Google Analytics (GA) with iWeb sites to measure clicks on outbound links. Here's the setup:
1) My website's online, and GA is working properly.
2) I don't sell stuff directly, but I do have a "Purchase" page which contains a link to a specific Amazon page.
3) I'm pretty sure I can measure how many people go to the Purchase page using GA, but how do I measure whether visitors click on the Amazon link? It would be interesting to me to be able to gauge what the conversion rate is; that is, how many people actually proceed to purchase the product at Amazon.
I've checked the GA instructions and there's a page about manually tracking clicks on outbound links but it requires some code inputting. I know zero about coding, but I'm pretty sure that in iWeb you can't get access to the source code to input the required code.
Am I wrong about this? And if I am, then does anyone here know how to measure the clickthrough rate?
Anyway, hope you can help. Thanks in advance.

I don't know about the link tracking but you could have the link take you to a redirect page which automatically sends them to Amazon.com after a preset time, 0 seconds to whatever you'd like. You can put a counter on that redirect page, like StatCounter. StatCounter can tell you how many, from where they came, i.e country and area, repeat visits, etc.
Tutorials #12 & #13 describe how to put a visible counter on a page but with a redirect page you wouldn't have to bother since it wouldn't be seen. You can get all of your information from your account on the StatCounter site.
The redirect page would be a simple plain text page titled redirect.html and would look like this:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="refresh"
content="0; Destination URL">
<title>Redirecting or whatever you'd like to appear at the top of the browser</title>
</head>
<body>
</body>
</html>
0 Is the number of seconds to wait before redirecting the visitor. If set to zero the visitor would not know they were being redirected. Replace Destination URL with the Amazon URL you want them to go to.
OT

I just have questions about the AirPort Express and how it works.

My household Wi-Fi is not the strongest in my room and I found out about the AirPort Express and I read the overvie, but I still have some questions on how it works, how its setup and other questions as well.

The AirPort Express will not wirelessly extend the signal from another router unless that router is also an Apple product.
Not sure what other questions you might have, but we'll try to answer if you want to ask.

Question about suitability of iPhone and specific comparisons

I like the Verizon network (for which I'm considering upgrading to the Omnia II) but am thinking about biting the bullet and going to AT&T for the iPhone. I use Macs at home and at work. My main uses will be phonecalls (with reliable voice dialing from my car - bluetooth stereo and earpiece), mail (Exchange server access for calendar, mail, and addressbook), internet through the cellphone network (not wifi) - browsing, SFTP, VNC, etc., watching videos, photos, and listening to music, calendar reminders (as well as periodic sound reminders for missed calls, voicemails, etc.), opening PDF and Word documents, GPS (ideally with spoken driving directions),and Skype. Given these uses, can anyone advise me if there's anything here that is a problem for the iPhone?
thanks,
Mike

"VNC"
There are pretty nice VNC clients for the platform, the best being Jaadu VNC. (See my just-published "Everything you will ever want to know about the remote desktop controllers on the iPhone" for more info if interested; it's been cross-posted to several iPhone forums. Not this one - yet - as I still don't have Level 1.)
watching videos
The 3G S (but not the 3G!) is far better than current for example Windows Mobile or Symbian phones in that it can play back MPEG-4 / H.264 videos without excessive power consumption. That is, if all your videos are in this format, the 3G S is the way to go.
Nevertheless, if your videos are in DivX, XviD or - even worse - WMV, you won't be able to natively play them back - you'll need to transcode them first.
This, unfortunately, also means WMV streaming TV stations are far harder to watch than on, say, Windows Mobile. The only AppStore app ("Streamer") supporting them is really bad and delivers dismal performance, even on the 3G S.

Question about Movie Rental Times and AirPlay

Just wondering. I have been sitting with my Apple TV2 since I got it this morning with it saying to download an hd movie. 1920 minutes remaining.I can get a faster download off my computer so that comes to my second question. Can I rent it on my computer and airplay it to my Apple TV?
Oh and my network speed is 3mbs. Not alot I know... But is that ok?

Are either of you using a DNS server / name server other than the one provided by your Internet service provider? OpenDNS or Google's DNS service, for instance? (If you don't know what I'm talking about, probably not.) There have been a number of reports suggesting that this can result in slow media downloads due to the way the movie servers try to optimize delivery based on your location, though it's unclear to me how accurate this really is.
Also, be aware that by default, the new Apple TVs provide "hi-def" rentals from the iTunes store (this is not applicable to Netflix), which means a larger and therefore longer download. To rent standard definition, you have to go into Settings and switch rentals to standard definition.

Question about evictor, application performance, and log growth

Hello,
I've got an application that using two BDB environments, one with critical data and one with data that can be reconstructed, just for the sake of backup convenience. For a while, I was getting OutOfMemoryErrors with increasing frequency. This caused the app to crash without closing the databases or the environment until the recovery time was around 30 minutes. After reading through many of the posts here and trying various workarounds, I got to a state where that stopped happening. I think that what did that fixed is was decreased the cache sizes.
Then, I was seeing what appeared to be evictor deadlocks. The application would hang for thirty minutes before a monitoring script that I've got would detect that no work was being done and would restart the application. Another round of searching ensued and I seem to have gotten it to a state where it doesn't run out of memory or deadlock anymore.
After getting rid of all these issues and letting it run for four or five days, the size of one of the critical BDB environment was 550GB. Since it was almost filling the drive, I moved it aside and created a new BDB for the app to use. Now, I'm trying to figure out what happened. It looks like the BDB contains about 15G of actual data.
It seems like everything starts out fine and then, somehow, it starts to collapse under the weight of itself. I'd like to figure out what type of abuse I may be guilty of that could cause this.
Here's a little bit about my application:
First (critical) BDB environment:
- add only, no deletes
- two databases
- average data sizes are 1k and 11k respectively
- average key sizes are around 80 and 16 bytes respectively
- almost no locality of reference to access pattern in either
- minimal lookups, mostly used as an archive
- cache size is 1MB
- 8 threads reading/writing, 40 threads reading only
Second (reconstructable) BDB environment:
- six databases
- five databases are mostly add with purges of two-week-old data
- one database has frequent adds and deletes
- lots of lookups, things are likely to be looked up shortly after they're added
- cache size is 64MB
- 40 threads reading/writing
On both environments,I've set je.evictor.forcedYield=true.
I'm running the JVM with:
-Xmx1800m
-Dje.adler32.chunkSize=8192
-XX:+UseMembar
JVM version is:
java version "1.6.0_01"
Java(TM) SE Runtime Environment (build 1.6.0_01-b06)
Java HotSpot(TM) Server VM (build 1.6.0_01-b06, mixed mode)
BDB version is 3.2.23
OS/Kernel is:
Linux app2 2.6.9-42.0.10.ELsmp #1 SMP Fri Feb 16 17:17:21 EST 2007 i686 i686 i386 GNU/Linux
So, my question is:
What could cause the critical database (especially with no deletes) to grow to 550GB when there's only 15GB of data in it? It was my understanding that the cleaner should take care of any unused log file cruft. It seems like the log files grow faster as the performance gets worse. I have no idea which is the cause or the effect.
And, I guess the real question is how can I prevent this in the future?
Thanks,
-Justin

For the record, the problem was that the user's cache size was too small for the size of the database thereby creating a large number of records in the log when eviction of dirty records occurred. The cleaner was unable to keep up with the log load.
Note to readers: eviction of dirty records causes records to be written to the log. JE has to evict to somewhere and the log is what it uses.
Charles Lamb

Question about full cycle charges and battery life

So I've had the new iPad since day 1 and absolutely love it, though recently I've noticed that my battery life doesn't seem to hold up as well as it has in the past. I've done three full cycle charges since getting it however during my latest one I accidently brought along my iPod wall charger and not the one that comes with the iPad. My iPad was fully discharged and I plugged it in assuming that in the 7 hour window I had that it would be fully charged within 5 hours, but this was not the case due to me having the wrong charger. After about 7 hrs of charging it was only at around 60-70% so I had to unplug it, bring it home, then plug it in once more using the correct charger. Probably a fairly obvious question but does this not count as a full cycle charge because I unplugged it? Should I perform another full cycle charge even though this most recent one was not even a week ago. I know you're supposed to completely discharge your battery as few times as possible so it worries me having to do it again so soon.
About battery life, I've noticed lately that my iPad battery seems to be depleting quicker than normal, and was hoping that perhaps this was caused by being overdue for a full-cycle charge which I may have flubbed as seen above. I'm aware of a majority of the little tips and tricks to prolong battery life however I'm not so knowledgeable on the "do's and don'ts" of charging the actual iPad so any information on that would be helpful. I should also note that unfortunately I accidently left by iPad in a hot car for a little over an hour and was tremendously devastated knowing what this can do to the battery, so could this be the main cause for a seemingly weaker battery?
Thanks for any feedback!

The quickest way (and really the only way) to charge your iPad is with the included 10W USB Power Adapter. iPad will also charge, although more slowly, when attached to a computer with a high-power USB port (many recent Mac computers) or with an iPhone Power Adapter (5W). When attached to a computer via a standard USB port (most PCs or older Mac computers) iPad will charge very slowly (but iPad indicates not charging). Make sure your computer is on while charging iPad via USB. If iPad is connected to a computer that’s turned off or is in sleep or standby mode, the iPad battery will continue to drain.
Apple recommends that once a month you let the iPad fully discharge & then recharge to 100%.
How to Calibrate Your Mac, iPhone, or iPad Battery
http://www.macblend.com/how-to-calibrate-your-mac-iphone-or-ipad-battery/
At this link http://www.tomshardware.com/reviews/galaxy-tab-android-tablet,3014-11.html , tests show that the iPad 2 battery (25 watt-hours) will charge to 90% in 3 hours 1 minute. It will charge to 100% in 4 hours 2 minutes. The new iPad has a larger capacity battery (42 watt-hours), so using the 10W charger will obviously take longer. If you are using your iPad while charging, it will take even longer. It's best to turn your new iPad OFF and charge over night. Also look at The iPad's charging challenge explained http://www.macworld.com/article/1150356/ipadcharging.html
Also, if you have a 3rd generation iPad, look at
Apple: iPad Battery Nothing to Get Charged Up About
http://allthingsd.com/20120327/apple-ipad-battery-nothing-to-get-charged-up-abou t/
Apple Explains New iPad's Continued Charging Beyond 100% Battery Level
http://www.macrumors.com/2012/03/27/apple-explains-new-ipads-continued-charging- beyond-100-battery-level/
New iPad Takes Much Longer to Charge Than iPad 2
http://www.iphonehacks.com/2012/03/new-ipad-takes-much-longer-to-charge-than-ipa d-2.html
Apple Batteries - iPad http://www.apple.com/batteries/ipad.html
Extend iPad Battery Life (Look at pjl123 comment)
https://discussions.apple.com/thread/3921324?tstart=30
New iPad Slow to Recharge, Barely Charges During Use
http://www.pcworld.com/article/252326/new_ipad_slow_to_recharge_barely_charges_d uring_use.html
Tips About Charging for New iPad 3
http://goodscool-electronics.blogspot.com/2012/04/tips-about-charging-for-new-ip ad-3.html
Prolong battery lifespan for iPad / iPad 2 / iPad 3: charging tips
http://thehowto.wikidot.com/prolong-battery-lifespan-for-ipad
In rare instances when using the Camera Connection Kit, you may notice that iPad does not charge after using the Camera Connection Kit. Disconnecting and reconnecting the iPad from the charger will resolve this issue.
 Cheers, Tom

Question about Photoshop scratch disk and specific setup

Hi Folks
Thanks for the help in advance.
I'm a novice and need help finding a solution to a new PC Build. (Windows 7 Pro 64bit with Photoshop CS6)
I only recently found out about having a scratch disk dedicated for photoshop (very novice i know ), and was wondering if a 120-128GB SSD would be enough? (Please bear in mind I can't fit large SSD raid configs to my budget, plus I live in New Zealand, so prices are higher for SSD at the moment).
I only edit single camera RAW files at a time around 25mb per file, with no large amount of layers and very rarely do large images i.e. Panorama etc. I have searched the forums but could not find a concrete answer.
My setup was originally meant for a HTPC (I don't intend to overclock), but I will also be using it for light photography projects. Specs below:
CPU: Intel i7 3770
Mobo: Asrock B75 Pro3-M (or Asus P8H77m Pro, depending on budget)
16gb Ram (maybe bump up to 32gb later)
120-128gb SSD for OS and apps
120-128gb SSD scratch disk
2 TB HDD for storage
If anyone knows, the motherboards I've listed have 3x Sata3 ports, Asrock has one Intel chip and two Asmedia controlled Sata3 ports, while Asus has 2x Intel controlled and 1x Marvell controlled Sata3 port. If I went with the Asrock, would it be okay to connect the OS/Apps SSD to the intel controlled sata3 port and have the scratch disk and storage HDD to the Asmedia sata3 ports?
And one more novice question, when I begin to edit my images, is it best to transfer my photos from memory card to storage HDD then work from there? Or would it be quicker opening images direct from a USB 3.0 card reader / USB 3.0 external hard drive?
Thanks again everyone, really appreciate it

priddye wrote:
Just to clarify, if/when I get one 256gb SSD for my main C: drive, I can load the OS/Apps and store some data for the time being (until I get another SSD) and use the 2TB HDD for scratch disk only?
Yes, that's what I meant. You could try putting Photoshop scratch on C: at least temporarily, and watch your free space carefully. If you don't work on big documents or set your history states to be very large, it might be workable. But be careful. The safe "set it and forget it" configuration is to make your HDD the one and only Photoshop scratch drive.
When I do get around to getting the second 256gb, I will look at installing the two SSD's in RAID configuration. If i were to do this, can I load the OS/Apps to the RAID SSD's as well as using them for scratch disks and have the 2TB HDD for storage? I hope that makes sense.
Sounds about right; with 512GB on tap you should be able to run just about everything from C:, as long as you don't keep your entire photo library on there. Realistically, on a big system that's got a lot of apps installed and has been used for some time, Windows and your apps may end up consuming 100 to 150 GB, so that would still leave you a lot of breathing room.
Keep in mind that what you describe may require 3rd party re-partitioning software and/or backup and restoral, or a complete reinstallation of Windows and everything (usually the latter is what is recommended when moving up to a RAID system volume).
By the way, SSDs stay in best working order if you overprovision - i.e., maintain a fair amount of free space. The internal controllers need the free space to keep the data organized well and maintain top performance.
-Noel

Questions about Assumption of Liability and device to be used for unlimited data plan

This is my first post on here. I have an opportunity that someone I know is willing to transfer his smartphone plan with unlimited data to me. I have read extensively on here and other sites and gathered some information, and also heard of many complications and questionable losses of unlimited data plans when making various types of changes to devices or services. Some of what I read may be outdated as well if Verizon has made changes in their policies, so I will start with the most obvious question: as of this date, is an AOL possible while keeping the unlimited data plan intact?
If so, here are some other questions I have:
-Will I receive a new SIM card by mail or do I need to use my friend's old SIM card?
-If my ultimate end goal is to use laptop, do I have to connect through a smartphone (and is there any additional charge for that, or would it change the plan), or can I put the SIM card in a mobile hotspot such as the MHS291L and use only the data portion of the plan?
-After getting the plan, is there any way I can get TWO SIM cards - one for a mobile hotspot, and the other strictly for voice and text? If so, how much extra would that cost?
-If we went to a Verizon store to do this transfer or AOL, how can we be absolutely certain it goes smoothly, that no one makes any unauthorized plan changes and does not lose the unlimited data? I have unfortunately read some horror stories of it being lost in similar situations, no one seems to be accountable, and it winds up costing someone countless hours of struggle with Verizon to try to get it back (whether they are successful or not I don't know).
-If at some point the SIM card was lost (such as if I lost the device), can it be replaced without affecting the plan?
For what it's worth (especially for those working for Verizon), I am not looking for a way to hog up absurd amounts of data but simply to be able to do the basic stuff I need to online and maybe watch a movie once in a while without having really huge bills. Even if I used the internet without giving data consumption a second thought, I doubt I'd go much over 25-30GB most months.
Thanks to whoever can provide me with information.

Hi NicandroN_VZW, sorry i did not see your reply in time but thank you just the same. I called the number for the AOL department and they were able to help me with it pretty easily and answer most of my questions
I do have a couple other questions regarding the unlimited data plan on smartphones. I have seen various comments regarding these things online, and i can make a good guess about what "might work," but i'm really looking to know Verizon's official policy on these things, if one exists. In case any non-verizon employees are able to provide this information as well, if you have references to where i can find it in writing that would be helpful.
First, i realize there is an optional $30 fee for mobile hotspot use. But does Verizon have any policy about whether this fee must be paid if i connect only via a USB cable (since it would not actually be a "hotspot," and could not connect multiple devices)?
And my other question is, if i do opt to pay the $30 hotspot fee, is there any policy either for or against using that SIM card in a 4g hotspot such as the MHS291L?
PS i am asking these things here rather than by PM because, given the wide range of opinions which can be found online and that others have looked into similar things, i am sure other people could also benefit from knowing Verizon's policy regarding these things.

Question about "fast fsck", ext4 and defragmentation status [SOLVED]

Similar Messages

Maybe you are looking for