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• Unix : `nc` on Ubuntu vs Redhat (netcat)

  - by bguiz

  How do I achieve the equivalent of nc -q in Redhat 5? Details? nc -q -1 local host ${PORT} ${CMD} In Ubuntu, nc may be use as above, with the -q option. See manpage. -q after EOF on stdin, wait the specified number of seconds and then quit. If seconds is negative, wait forever. However, this option is not available in Redhat 5. See manpage. (Note: The Red Hat website is horrible to search, if someone finds their manpage for nc, please edit this post or comment with the new link).

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• Canon LiDE 600F FAU on Snow Leopard?

  - by jdmuys

  Hello, I have been able to use my Canon LiDE 600F scanner under Snow Leopard to scan paper sheet, after installing Canon's latest driver software. However, I cannot find a way to make the FAU (Film Adaptor Unit) to work: Canon's software want to calibrate it first and gives an error message "Calibration cannot be performed. Pull out the film. 182.0.0". (of course there is no film). Hamrick's VueScan doesn't seem to support the FAU Apple's Image Capture doesn't propose a film option either Did I miss something? Did somebody manage to scan film (positive or negative) using the LiDE 600F under Snow Leopard? Many thanks

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• How safe is it to run CHKDSK on an SSD?

  - by Eilon

  I recently saw Windows 7 pop up a warning or two that I should run chkdsk on my laptop. My laptop came with an SSD and I'm not sure if there are any negative implications to running chkdsk on such a drive. Are there any potential issues with reporting "bad sectors" on the drive? I would imagine that the physical concept of sectors is completely different between a platter and a microchip. I don't think my SSD supports TRIM. It's about 14 months old and a quick web search seems to hint that it doesn't (though it's nearly impossible to find out this info for sure!). I'm also not sure if TRIM is even relevant here since there shouldn't be much in the way of deletes. So, how safe is it to run chkdsk on my SSD drive? The model of SSD that I have is reported as "Samsung SSD PB22-JS3 2.5".

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• How to make ClearType looks ok even with large fonts

  - by Sorin Sbarnea

  I discovered that on large/huge fonts ClearType does have a negative impact. Just take a look at http://patterns.dataincubator.org/book/ page (check title with huge fonts versus normal text). If you are on Windows 7 you can use Win+Plus/Minus to zoom in/out. I'm looking for a configuration that would make both small fonts and large fonts look well. The system is Windows 7 but I suppose you could replicate the problem on Vista and even XP if you activate ClearType. Current results: ClearType on and tunned - small fonts looking good and large one looking bad ClearType off - small fonts looking bad and large one looking ok (smoothed)

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• rm failing inside cron script

  - by Nicholas

  I have a cron job calling a bash script which runs fine, except for one line inside it that is suppose to remove all fines in a directory. The result of this line is always 'no such file or directory' even though I have verified (many times) that there are files in that directory. The line in question is as simply: rm /dir1/dir2/dir3/* The script works fine when run manually in the terminal, so it must be something about how the cron is run. I've tried giving 'dir3' and all the files inside it every permission possible, so it shouldn't be a permission problem. (The directory and files are also owned by the user). I've tried specifing 'SHELL=/bin/bash' inside 'crontab'. There is no sticky bit set and there is no alias on the rm command. Interestingly changing the 'rm' command to 'ls' gives the same negative result (unless you remove the trailing '*', and then that works). What am I missing here?

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• What is polarity for an unmarked USB hub?

  - by Feral Oink

  On my USB hub where the power supply plugs in, the polarity is unmarked (I got it used, from my brother's friend). I need to know what the polarity should be. I don't think it makes a difference about the brand. Could someone who has a USB hub tell me what the polarity markings are? This is why I need to know about the polarity: Usually the center pin is positive and the outer pin is negative. But I'm not sure with this, and want to be certain before I plug anything into it.

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• Per-machine decentralised DNS caching - nscd/lwresd/etc

  - by Dan Carley

  Preface: We have caching resolvers at each of our geographic network locations. These are clustered for resiliency and their locality reduces the latency of internal requests generated by our servers. This works well. Except that a vast quantity of the requests seen over the wire are lookups for the same records, generated by applications which don't perform any DNS caching of their own. Questions: Is there a significant benefit to running lightweight caching daemons on the individual servers in order to reduce repeated requests from hitting the network? Does anyone have experience of using [u]nscd, lwresd or dnscache to do such a thing? Are there any other packages worth looking at? Any caveats to beware of? Besides the obvious, caching and negative caching stale results.

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• Oracle tuning optimizer index cost adj and optimizer index caching

  - by Darryl Braaten

  What is the correct way to set the optimizer index cost adj parameter for Oracle. As a developer I have observed huge performance improvements as this parameter is lowered. Common queries are reduced from 2 seconds to 200ms. There are lots of warnings on the net that lowering this value will cause dire issues with the database, but no detail is given on what will start going wrong. I am currently only seeing only an upside, much improved application performance and no downside. I need to better understand the possible negative repercussions of adjusting these parameters.

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• Tor Browser: how do I restart just the browser?

  - by GDR

  I'm using Tor Browser on Linux from time to time, but I close the browser because it has high memory usage, and leave Vidala running in background to help the network and relay traffic. The problem is, when I want to use Tor Browser again, I have to shut down Vidala and start it again. This takes time and has negative effect on the network. When I execute ./App/Firefox/firefox-bin, the browser starts but says it's not connected via Tor network. Any ideas how to start tor browser and make it connect to existing Vidala instance?

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• SpeedTracer NETWORK_RESOURCE_RESPONSE vs NETWORK_RESOURCE_FINISH

  - by Ben Flynn

  I'm using SpeedTracer with GoogleChrome to measure the load times of requested resources. The SpeedTracer site says: NETWORK_RESOURCE_RESPONSE "Indicates that the renderer has started receiving bits from the resource loader" NETWORK_RESOURCE_FINISH "Indictes a resource load is successful and complete." In my mind that means we would always see a network resource response (bytes are arriving) before we see a finish (all bytes received). This doesn't seem to be the case at all. Here is a sample: Request Timing @33519ms for 926ms Response Timing @34445ms for -847ms Total Timing @33519ms for 78ms I'm guessing response time isn't supposed to be negative. Can someone explain this or is this a bug? I'm using Chrome 10.0.612.3 dev with a SpeedTracer I downloaded today.

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• Scanned JPEGs are large and slow to load - can they be optimized losslessly?

  - by Alistair Knock

  I have hundreds of JPEG photographs which were scanned about 5 years ago from negative using a Konica Minolta DiMAGE Scan Dual IV. The dimensions are ~4500x3000, and the filesize is around 12Mb, compared to shots from a DSLR with dimensions of 3000x2300 and filesize of 2-4Mb (actually, these are the output from a RAW convertor). The filesize is obviously quite a big difference, but the issue that's bothering me is that the (perceived) loading time is at least 10 times slower. Is this size/speed discrepancy likely to be because the scanner software saved the JPEGs inefficiently / using an old compression format, or is it simply that the scanned negatives contain much more "detail" (in the form of grain/noise) than the digital images? If the former, is there a way to losslessly optimize them? I've tried re-exporting the scanned files to full size JPEG from my RAW software but the filesize is pretty much the same. Both files will have been saved at 100 quality.

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• Clear / Flush cached memory

  - by TheDave

  I have a small VPS with 6GB RAM hosting a couple of websites. Recently I have noticed that my cached memory size is quite high - see below: Cpu(s): 0.1%us, 0.1%sy, 0.0%ni, 99.1%id, 0.0%wa, 0.2%hi, 0.4%si, 0.0%st Mem: 6113256k total, 5949620k used, 163636k free, 398584k buffers Swap: 1048564k total, 104k used, 1048460k free, 3586468k cached After investigating if there is some method to have this flushed or cleared I stumbled upon a command which is: sync; echo 3 > /proc/sys/vm/drop_caches I read it could be useful to add this to a chron-task/job. Is this method recommended or could this lead to potential problems? The only concern I have is that I use one Magento installation on Memcached - could this have any negative effects on it? I am certainly not a pro therefore I would very much appreciate some expert advise. PS: My VPS runs on CentOS 5 x64 and I have WHM + NGINX installed.

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• Canon LiDE 600F FAU on Snow Leopard?

  - by jdmuys

  I have been able to use my Canon LiDE 600F scanner under Snow Leopard to scan paper sheet, after installing Canon's latest driver software. However, I cannot find a way to make the FAU (Film Adaptor Unit) to work: Canon's software want to calibrate it first and gives an error message "Calibration cannot be performed. Pull out the film. 182.0.0". (of course there is no film). Hamrick's VueScan doesn't seem to support the FAU Apple's Image Capture doesn't propose a film option either Did I miss something? Did somebody manage to scan film (positive or negative) using the LiDE 600F under Snow Leopard? Many thanks

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• Is vSphere's Data Recover appliance 'production-ready'?

  - by Chopper3

  I have a smallish lab environment (16 x ESX4iU1 hosts and VC4U1) that I periodically want to backup. Normally in production we snap to secondary SAN boxes then have disk-based VTL backups via NetBackup which eventually migrate to off-site removable disks but this seems like an overkill for my own kit. I've spent a bit of time with vSphere's 'Data Recovery' appliance, it was easy enough to setup and I've not really ran into any issues with it but that doesn't mean I trust it fully. Have you had any experiences with it, positive or negative that would help me decide whether to trust it or pay Symantec for more licences? Thank you in advance.

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• Is there anything like a link or shared mount point for FAT32 folders in Linux/Android?

  - by endolith

  I often want the same files to be accessed by different apps on my Android phone, but the apps look in different folders. Is there a way to make two different folder paths on a FAT SD card point to the same file? For EXT, I think I could do this with a symbolic or hard link, but those don't exist for FAT. Can FAT be extended to support them? Can Android use an EXT-formatted SD card? Can a folder be mounted on top of another folder? If this does exist, does it have any negative side effects?

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• Mongodump on Gridfs is killing the host IOs

  - by Raphael

  I'm trying to make a mongodump from our production mongodb while the production is running. We have three production instances, one regular mongodb, one with very few gb of data on gridfs, one with a larger amount of data on gridfs. All mongodb instances are running in version 2.4.9 on a ubuntu 10.04 virtual server. I use a mongodump command to export the bases to another server. Unfortunately our machines are virtually hosted in a "low performances" datacenter (vmware based) so when I try to export the large gridfs db, the disk IO hits 100% (and 50% of the cpu starts waiting for IO too). This has a very negative impact on the production applicatiosn because db access time is excessively increased, making the applications unusable. I'm looking for a way to regulate the mongodump so the export goes slower but cooler on the hardware ressources allowing better performances for the applications to run. Has anyone had a similar scenario ?

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• Excel wizardness needed - Group By, Sort, Count function help

  - by Chris

  Riddle me this: You have 3 part numbers with the same part name xyz, each with a quantity of 10 items. The items can be picked during the day or week, therefore changing the amount of items on hand. I know I need to use the group by, sort, count and perhaps sumif formulas to have a running count of the number of items on hand at the end of each day (which could be positive or negative). Help? it wont let me add an image because i'm a new user. 'Oops! Your edit couldn't be submitted because: * we're sorry, but as a spam prevention mechanism, new users aren't allowed to post images. Earn more than 10 reputation to post images. '

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• What is the meaining of "deassert" in this context?

  - by Sam.Rueby

  The English majors over at Dell provided me with this error message provided by a PowerEdge 2950. CPU2 Status: Processor sensors for CPU2, IERR was deasserted I've Googled it, random forum posts aren't providing me with a clear answer. It's also apparently not a word: http://dictionary.reference.com/browse/deassert?s=t I can guess the meaning. Assert: to state with assurance, confidence, or force Okay. So the negative of that. The state of lack-of-confidence? What is this error message trying to tell me? Memory errors were grouped with this one: is it trying to say that IERR for CPU2 should be set, but is not? That the current system state is SNAFU but CPU2 sees everything as fine?

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• Is it possible, and is it advisable, to host a mail server on a Windows Azure VM role?

  - by JcFx

  I know this question has been asked on various forums before, and that all the answer were negative, but many of the answers are quite old, and with Azure developing so quickly it seems useful to ask it again. Can we run a mail server (such as mailenable) on an Azure VM? And if not, why not? I've seen one posting on the MS forums (here) that suggests the IP of the Azure machine would be blacklisted as a source of spam. Why would this be (as opposed to hosting a mailserver on a dedicated box)?

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• Few questions on giga tweaker

  - by user23950

  I better consult first the people here before I do anything unnecessary using this app called giga tweaker. I don't really understand what this increase the performance of your CPU thing. It is under Customization-Memory Management-ram & disk cache of giga tweaker. What will happen if I change the level cache size of l2 cache into the highest possible value which is 8Mb. What are the negative effects of doing it? The file system caching memory, still under Customization-Memory Management-ram & disk cache. What effects will it have on my system which has 2Gb of Ram and 2.50 Ghz of Dual Core CPU. Please enlighten me.

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• How Do You Stress-Test Your Hard Drives?

  - by MetaHyperBolic

  When looking for large new drives (= 1 TB) on newegg and the like, I note a number of reviews talking about drives being either D.O.A. or hitting the Click of Death (or even releasing the Magic Smoke) within a week or so of use. A portion of the reviews mention this phenomenon whether the drive in question is Western Digital or Hitachi or whatever. For those of you using Windows, what do you to: 1) Place a large initial stress on the drive to see if it can take it? For how long? 2) Test the drive afterwards (presumably with some sort of S.M.A.R.T. tool or others) to see if any negative changes have been noted? Note: This is one component of a larger plan for both high-availability and backups for my home data.

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• A definition for a CPU second?

  - by dude

  Hey, I'm totally behind this topic. Yesterday I was doing profiling for some script I'm working on, and the unit for time spent was a 'CPU second'. Can anyone remind me with the definition of it? For example for some profiling I got: 200.750 CPU seconds. What does that supposed to mean? At other case and for time consuming process I got: -347.977 CPU seconds, a negative number! Is there anyway I can convert that time, to calendar time? Cheers,

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• Disadvantages of using a swap file/partition on an SSD, even when swappiness is set to 0

  - by pjv

  What are the disadvantages of using a swap file/partition on an SSD, even when swappiness is set to 0 I'm particularly interested in the /proc/sys/vm/swappiness=0 case. How much writes are still done, in practice, to that swap file, and does it have a negative impact to the SSD or any other disadvantage? Or would it nearly compare to not having a swap file? I am pretty aware of what swappiness=0 means, just not of what it amounts to in practice. My question stems from a problem I am experiencing without a swap: http://stackoverflow.com/questions/4567972/error-executing-aapt-all-of-the-sudden. There are similar questions regarding SSD and swap but they don't go in-depth into the swappiness=0: Disadvantages of not having a swap partition, Should I keep my swap file on an SSD drive?

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• Putting a whole linux server under source control (git)

  - by Tobias Hertkorn

  I am thinking about putting my whole linux server under version control using git. The reason behind it being that that might be the easiest way to detect malicious modifications/rootkits. All I would naively think is necessary to check the integrity of the system: Mount the linux partition every week or so using a rescue system, check if the git repository is still untempered and then issue a git status to detect any changes made to the system. Apart from the obvious waste in disk space, are there any other negative side-effects? Is it a totally crazy idea? Is it even a secure way to check against rootkits since I most likely would have to at least exclude /dev and /proc ?

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• Excel 2010: How to color the area between charts?

  - by Quasdunk

  Hello, I asked this question already on stackoverflow but it hasn't been answered yet. Instead I was advised to try it here, so here I go :) So there's that simple XY-Line-Chart in Excel (2010). It is surrounded by two other graphs which are parallel but offset by the same factor in both the positive and negative direction - something like this: ---------------- (positively offset parallel graph) ---------------- (main graph) ---------------- (negatively offset parallel graph) Now I want to color the space between the main graph and the offset ones, but I just can't seem to find a way! Is it maybe possible with VBA? Or is there maybe a solution for Excel 2007?

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