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• Disable RAID Controller

  - by B.Mr.W.

  I have some decent HP Proliants server that come with "HP Smart Array P410i Controller" enabled, I am using these boxes to set up a Hadoop cluster and I know, RAID is for sure a no-no for Hadoop since the application itself will take care of data redundancy and extra intelligence provided by RAID won't be helpful and might turn down the performance. I tried to disable the devices at the BIOS and the box cannot even access the disk afterwards. So I am assuming the controller is sitting between disks and mother board, and we have to turn it on and configure it to "level0" or something like that. I am wondering what should I do to "disable" the RAID functionality so it will fit into the Hadoop environment.

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• Suggestions for Backup solution

  - by jiewmeng

  i am considering between windows home server simple nas extra HDD's in desktop btw, i will be the main user i am looking to fulfil the following needs: reliability (i am think RAID 1 or 5) not so prone to virus/malware infections (will using a separate NAS or home server help? say windows home server is still a windows pc except separated by network?) power efficiency (eg. spin down when not in use) download (eg. i may want to dl big files/torrents overnight and i may not want to use a full powered PC for it? does a full pc vs NAS provide significant power usage to justify cost of new system esp. since i am only user?) performance (i guess i like to write/access my files fast, on 2nd thought, maybe for backup i can forgo this? maybe for a WD Green HDD? but how much slower will it be? plus since i am the only user, i think the whole HDD will be mine?)

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• How long do uploaded files stay in the tmp folder in Linux Ubuntu?

  - by Jean-Nicolas Boulay Desjardins

  I am building a web application where my users will be able to upload files. After the files are uploaded I need to send the files to two other servers, and after they will be deleted from the server where they were just uploaded to. I am wandering is it a good I idea to keep the uploaded files in the tmp/ folder the time the uploaded files are sent to the other two servers or should I move them to another folder incase they get deleted? I am also wandering because I would like to know if I have to build a cron script to get rid of the files that have been transfered to the other servers so that I get my disk space back.

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• What's the maximum size Windows 7 allows for ReadyBoost?

  - by ymasood

  I read somewhere the Windows 7 had removed the limit on ReadyBoost from 4GB and now allows an unlimited number of GBs. I would like to reconfirm this as a fact. At present, my Windows 7 RC 7100 allows me a maximum of 4GB on one of my 8GB flash drives (though I've tried to connect two at a time and use 4GB on one and 2GB on another). Thanks!

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• Analyse frequencies of date ranges in Google Spreadsheet

  - by wnstnsmth

  I have a Google Spreadsheet where I would like to compute occurrences of date ranges. As you can see in my sheet, there is a column date_utc+1 which contains almost random date data. What I would like to do is put the date values into bins of 6 hours each, i.e., 12/5/2012 23:57:04 until 12/6/2012 0:03:17 would be in the first bin, 12/6/2012 11:20:53 until 12/6/2012 17:17:07 in the second bin, and so forth. Then, I would like to count the occurrence of those bins, such as bin_from bin_to freq ----------------------------------------------- 12/5/2012 23:57:04 12/6/2012 0:03:17 2 12/6/2012 11:20:53 12/6/2012 17:17:07 19 ... ... ... Hope it is clear what I mean. Partial hints are very welcome as well since I am pretty new to spreadsheeting.

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• How should I interpret the specifications of a SSD?

  - by paulgreg

  When considering to buy a SSD, how should I interpret the different specifications of the SSD? Here are some specific things that need to be deciphered: Controller (this can affect performance and endurance more than all other factors combined) Bus Technology Form Factor (Physical Size) Capacity NAND or NOR technology Power Consumption during Read, during Write, when Idle Read/Write Burst and Sustained Throughput All of these things I would like to be explained in more detail and their actual importance in selecting an SSD.

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• Huge HDD response time in Resource monitor

  - by Mille

  Just bought all parts for a computer and put it together and installed a fresh version of windows 7. After a while, when using the computer it gets very slow, and even closing down windows can take several minutes. I started to look in the resource monitor and though I found the answer watching my hdd. The thing is that the hdd completes all tests in Seagate's SeaTools for Windows successfully. Which makes me doubt on the problem and weather I can send it in to get an replacement. Suggestions on what it could be and what I can do about it? Here a screenshoot from the resource monitor:

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• dd on entire disk, but do not want empty portion

  - by Jonathan Henson

  I have a disk, say /dev/sda. Here is fdisk -l: Disk /dev/sda: 64.0 GB, 64023257088 bytes 255 heads, 63 sectors/track, 7783 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x0000e4b5 Device Boot Start End Blocks Id System /dev/sda1 * 1 27 209920 83 Linux Partition 1 does not end on cylinder boundary. /dev/sda2 27 525 4000768 5 Extended Partition 2 does not end on cylinder boundary. /dev/sda5 27 353 2621440 83 Linux /dev/sda6 353 405 416768 83 Linux /dev/sda7 405 490 675840 83 Linux /dev/sda8 490 525 282624 83 Linux I need to make an image to store on our file server for use in flashing other devices we are manufacturing so I only want the used space (only about 4gb). I want to keep the mbr etc... as this device should be boot ready as soon as the copy is finished. Any ideas? I previously had been using dd if=/dev/sda of=[//fileserver/file], but at that time, my master copy was on a 4gb flash ide.

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• Dual boot: Windows XP and Ubuntu

  - by user19455

  (I know that there are some questions similar to this one, but the ones I have read (and I have read more than one, did not answer my question) I have installed, in two physically different hard drives Windows XP and Ubuntu 9.0. I would like to have a dual boot that, if nothing was pressed, the Windows XP would start automatically. I have read about Grub but got the impression that it wasn't possible to default the operating system to start to something other than Ubuntu. Thanks.

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• My WD passport detected but not shown on my computer

  - by Rakesh Patel

  1TB WD harddisk is detected in laptop but drives not visible on my computer. Under disk managment drives shown without letters. Right clicking on these drives give 2 options: Delete volume Help. The same harddisk was running well on the same laptop a day before. It is also showing full size of hard drives, Healthy (Primary Partition) etc. (this happened after harddisk usage by guest). Harddisk is new only (about 5 month usage) Please suggest: Is there hardware related problem inside harddisk, if so is it repairable? Is there any option to recover data?

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• How do I catalog files on several external hard drives that I want to store off-line? OSX

  - by raudi

  My partner, an artist, has more than 10 external hardisks both USB and firewire and every 2-3 months a new one has to be added (She's working with videos and pictures) currently its 10TB and growing so too much for a affordable NAS. Right now the files are not indexed and I think can not be searched with spotlight because not all drives can be connected at the same time. So if she wants to search for a file, she has to guess which disk/disks (based mostly on the date) and then search several drives. Now I'm looking for a solution to index/catalog the drives, something like GentibusCD Cathy Disclib (all these solutions are unfortunately Windows only) Is there any software for OSX that will catalog all the hard drives, so she can search the catalog, find the files, and get the ID of the disk / disk name that has the content? Preferably something with a GUI so my partner can also use it easily Preferably with Thumbnails for pictures/videos (But even an equivalent to "tree /F /A" would be better than nothing)

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• USB sticks optimized for OS booting and virus removal [closed]

  - by Rupert

  I'm looking to buy some usb sticks which will mainly be used in tech support for the purposes of removing viruses and booting up various OS's. Therefore, I am looking for the following features: Write protected switch (so that they may be safely plugged in to potentially infected machines) As fast as possible (so that loading, for example, a windows recovery, doesn't take forever) At least 4GB in size Any other features that might be useful for the above purpose Price is no object but, of course, the cheaper the better.

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• Old HDD is not getting detected when connected through USB

  - by Mayur

  My laptop HDD got corrupted and I replaced that with a new HDD. Now I wanna retrieve the data in the old HDD. I tried using external HDD casing and connected it my laptop cable thru USB. But it is not getting detected. Is there any way to retrieve the data from my old HDD. Please help. Thanks

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• Is there a limit on the number of USB external drives?

  - by Beska

  I've got three external HDDs, all My Books, 500 GB, 750 GB, and 1 TB. If I hook one or two of them up to a computer, everything seems fine. If I hook all three of them to a computer (I've tried this on two different computers, one running Windows XP, one running Windows Vista), the bootup time goes up by more than an order of magnitude. It can suddenly take about 10-20 minutes to boot the machine, whereas before it might take a minute. All three drives work fine on their own. I'm not using any kind of hub; all three are plugged directly into the machine. Is this associated with some kind of inherent limit in USB? Is this bad hardware design in the CPU box? Is this a My Book problem?

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• Transfer Raid Drives to External Enclosure

  - by dubbeat

  I have 2 raid disks (a grand total of 360GB) in my laptop. I'm fast running out of space and want to install new drives. I've a pretty good idea how to do this. My question is what can I do with the drives that I remove? I've got lots of media files on these drives that I'd like to keep and maybe transfer back onto my laptop once I have the new drives installed. Bearing in mind that I know next to nothing about hardware how do you suggegst I go about reusing the removed drives somehow? Thanks,

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• How to know which disk has failed on a Mirrored Raid? marked as DR0 [migrated]

  - by Saariko

  Our 2ndry DC, which is on a W2K8R2 Mirrored software raid has lost it's sync, and disk management displays the failed redundancy error How do I know which of the disks has failed? (beside to try and replace one - and see if it loads and syncs) On the device manager, under disks I see both disks, one of them has an icon of: Disable, while the other doesn't Event log displays an event id 7 - bad block on Hard disk DR0 The thing is that looking in device manager, both disks are located in '0' location, which is bizzare

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• How can I combine non-identical disks efficiently?

  - by Odys

  There are some not-identical disk of various capacities that I want to combine (somehow). Since there are no duplicate models, I can't use raid between none of them. Is there a way to use them efficiently while being safe? What I have in mind is a software that will use them as if it were Raid-5 or something. I really don't care about max speed. I want in the end to have as less logical drives as possible. Also, I don't mind spending some money on hardware, if needed.

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• 4 month old 500 GB SATA HDD making noise?

  - by metal gear solid

  My 4 month old 500 GB SATA HDD making noise sometimes and the PC hangs when it makes noise when the noise stops desktop work fine. It doesn't happen every day but it does happen. Is something wrong with HDD, Data, power cable, or my cabinet's power supply? Should I run scandisk or defragmentation on the disk.

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• tell me how to corrupt my hard disk ???? please..

  - by amit

  Hi superuser, Please tell me how to corrupt my hard disk. I have dell inspiron 6400 & it's under complete cover insurance. Operating system is Window Vista Premium. So please tell me the method which actually work & damage/corrupt my hd.

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• How to know which disk has failed on a Mirrored Raid? marked as DR0

  - by Saariko

  Our 2ndry DC, which is on a W2K8R2 Mirrored software raid has lost it's sync, and disk management displays the failed redundancy error How do I know which of the disks has failed? (beside to try and replace one - and see if it loads and syncs) On the device manager, under disks I see both disks, one of them has an icon of: Disable, while the other doesn't Event log displays an event id 7 - bad block on Hard disk DR0 The thing is that looking in device manager, both disks are located in '0' location, which is bizzare

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• Recovery Harddisk for windows 7 (Details inside)

  - by iSumitG

  I want to create recovery media (DVD or HDD) for my Windows 7 running on my VAIO laptop. I noticed that my HDD is already having 13.51 GB partition which is labelled as "Recovery Partition" (not visible in My Computer but visible in Computer management tool in control panel). Can you please suggest me how to use this Recovery partition as a recovery media for my windows? I don't want to create DVDs as recovery media.

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• one 16K random read I/O issues 2 scsi I/O (16K and 4K) requests in linux

  - by hiroyuki

  I noticed weird issue when benchmarking random read I/O for files in linux (2.6.18). The Benchmarking program is my own program and it simply keeps reading 16KB of a file from a random offset. I traced I/O behavior at system call level and scsi level by systemtap and I noticed that one 16KB sysread issues 2 scsi I/Os as following. SYSPREAD random(8472) 3, 0x16fc5200, 16384, 128137183232 SCSI random(8472) 0 1 0 0 start-sector: 226321183 size: 4096 bufflen 4096 FROM_DEVICE 1354354008068009 SCSI random(8472) 0 1 0 0 start-sector: 226323431 size: 16384 bufflen 16384 FROM_DEVICE 1354354008075927 SYSPREAD random(8472) 3, 0x16fc5200, 16384, 21807710208 SCSI random(8472) 0 1 0 0 start-sector: 1889888935 size: 4096 bufflen 4096 FROM_DEVICE 1354354008085128 SCSI random(8472) 0 1 0 0 start-sector: 1889891823 size: 16384 bufflen 16384 FROM_DEVICE 1354354008097161 SYSPREAD random(8472) 3, 0x16fc5200, 16384, 139365318656 SCSI random(8472) 0 1 0 0 start-sector: 254092663 size: 4096 bufflen 4096 FROM_DEVICE 1354354008100633 SCSI random(8472) 0 1 0 0 start-sector: 254094879 size: 16384 bufflen 16384 FROM_DEVICE 1354354008111723 SYSPREAD random(8472) 3, 0x16fc5200, 16384, 60304424960 SCSI random(8472) 0 1 0 0 start-sector: 58119807 size: 4096 bufflen 4096 FROM_DEVICE 1354354008120469 SCSI random(8472) 0 1 0 0 start-sector: 58125415 size: 16384 bufflen 16384 FROM_DEVICE 1354354008126343 As shown above, one 16KB pread issues 2 scsi I/Os. (I traced scsi io dispatching with probe scsi.iodispatching. Please ignore values except for start-sector and size.) One scsi I/O is 16KB I/O as requested from the application and it's OK. The thing is the other 4KB I/O which I don't know why linux issues that I/O. of course, I/O performance is degraded by the weired 4KB I/O and I am having trouble. I also use fio (famous I/O benchmark tool) and noticed the same issue, so it's not from the application. Does anybody know what is going on ? Any comments or advices are appreciated. Thanks

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• kernel warning disk error for command write - solaris svm

  - by help_me

  Recently this warning came up on my message logs, scsi: [ID 107833 kern.warning] WARNING: /pci@1c,600000/scsi@2/sd@0,0 (sd0): Oct 27 00:14:44 Error for Command: write(10) Error Level:Retryable Oct 27 00:14:44 scsi: [ID 107833 kern.notice] Requested Block: 101515828 Error Block: 101515828 Oct 27 00:14:44 scsi: [ID 107833 kern.notice] Vendor: SEAGATE Serial Number: 0441B9B5H Oct 27 00:14:44 scsi: [ID 107833 kern.notice] Sense Key: Hardware Error Oct 27 00:14:44 scsi: [ID 107833 kern.notice] ASC: 0x19 (defect list error), ASCQ: 0x0, FRU: 0x2 This is showing signs of disk failing in my opinion. I have not seen the messages re-occurring. This is on a Solaris 9 Sparc system V240. The disks are managed by SVM and "metadb" is showing the flags as "a" Are there any tests or indications as to check/see if the disk is actually failing or was that error message initiated by something else. Thank you!

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• Pendrive not working on USB port - USB2 Enhanced Host Controller - 27CC

  - by user1664417

  I have a situation here, is kind of weird. Situation as below: If i enable the 'Intel(R) 82801G (ICH7 Family) USB2 Enhanced Host Controller - 27CC' , then my pc will not be able to read any USB stick/pendrive, but usb port work fine with keyboard and mouse. If I disable the device driver, then all kind of pendrive can be read. Below is What i have done : 1) try the same pendrive on other pc, it work like charm. 2) try others pendrive on issue pc, same problem, but it work fine in others pc. 3) try all the port, including the port that connected to mouse n keyboard. 4) update the driver version. 5) restore default setting of usb in bios Please help to solve these issue if anyone experience it before. Many thanks.. :

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• How to corrupt my hard disk ?

  - by amit

  Hi superuser, Please tell me how to corrupt my hard disk. I have Dell Inspiron 6400 & it's under complete cover insurance. Operating system is WindowS Vista Premium. So please tell me the method which actually work & damage/corrupt my hd.

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