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  • ZFS recordsize for VirtualBox and other virtual disks

    - by JOTN
    Has anyone run across any good benchmarks or other research on tuning the ZFS recordsize when putting virtual disk files on it for a guest OS? I'm using VirtualBox at the moment. I have notice significant performance improvement when working with a DBMS by setting the ZFS recordsize to the same as the DB blocksize, so I'm guessing matching the blocksize of the guest filesystem would also be a good idea.

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  • What filesystem for shared (read/write) PC/Mac external drive?

    - by webworm
    Is there a recommended filesystem to use when sharing an external drive between the Mac and PC? I understand there are options for Macs to read/write NTFS filesystems and also for PCs to read/write HFS+ filesystems. Is there a preferred filesystem or perhaps a different filesystem that both Mac and PC and read/write? I know I could use FAT32 but some of the files I use are larger than 4 GB (i.e. Virtual Machine images)

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  • How remove/de-index a page from Google?

    - by Jason
    On the results page when I Google "e-luminate", the 3rd and 4th link seems to point to specific directory deep within the folders which stores the images. How can I get rid of these 2 results from Google search results? How can I get Google to de-index it? I checked on the server and the folders did not seem different from other folders but these 2 paths seems to get indexed by Google. Thank you.

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  • Recognition of USB drive

    - by lamcro
    I have a Motorola phone, with a MicroSD slot, which my Ubuntu machine does not recognize as a USB drive. It does know there is something there since It automatically charges my phone whenever I connect it. using the command lsusb shows it as "Motorola PCS" Is there a way to tell Ubuntu/Linux that the connected hardware is a disk drive?

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  • Trouble with installing Ubuntu 14.04 alongside Windows 8.1

    - by user3121138
    I work with Windows 8.1 and today I installed Ubuntu 14.04 alongside it, but now I can't set the boot menu to display both OS. When I boot the system it normally loads Windows 8.1 without opening the boot menu. I created a boot USB with Yumi. When booting with Yumi and selecting "boot from hard disk", Ubuntu turned on. My drives: My laptop is a Fujitsu Lifebook AH532/G52 and the BIOS is a Phoenix v1.10

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  • Why doesn't my web page load completely every time?

    - by Gayanee Wijayasekara
    I have an intranet website running on IIS 7. When I try to load my site, it reacts differently every time. Here are the following different scenarios that occur when I try to load my site: The site loads right away and is working properly The site loads slowly and some my styling/images/javascript did not appear to load correctly. I receive a "503 service unavailable" error Any ideas why this is happening?

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  • How to restore OEM software after upgrade from Vista to WIndows 8 on Notebook, Aspire 6935G

    - by Rocky
    Recently I upgraded my notebook from Vista home premium to windows 8 pro, now after updating most of the preinstalled programs by Acer, I've found out they are not restored as before. For example, I can't access my hidden hard disk drive utility, finger print scanner, etc. Please tell me how to restore all these programs by Acer on Windows 8 pro which were originally available when I purchased my notebook with Vista.

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  • Windows install missing NTLDR

    - by Jack
    Hi all. I'm having trouble install WinXP Pro on my pc because NTLDR is missing or can't find during installation process. I highly doubt it's my DVD drive because this machine work fine before the install process. The DVD rom work. Is there a work around for this problem? edit: this is the problem that i'm having. I'm trying to reformat the hard disk with killdisk.

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  • ZFS Recover from Faulted Pool State

    - by nickv2002
    I have a six disk ZFS raidz1 pool and had a recent failure requiring a disk replacement. No problem normally, but this time my server hardware died before I could do the replacement (but after and unrelated to the drive failure as far as I can tell). I was able to get another machine from a friend to rebuild the system, but in the process of moving my drives over I had to swap their cables around a bunch until I got the right configuration where the remaining 5 good disks were seen as online. This process seems to have generated some checksum errors for the pool/raidz. I have the 5 remaining drives set up now and a good drive installed and ready to take the place of the drive that died. However, since my pool state is FAULTED I'm unable to do the replacement. root@zfs:~# zpool replace tank 1298243857915644462 /dev/sdb cannot open 'tank': pool is unavailable Is there any way to recover from this error? I would think that having 5 of the 6 drives online would be enough to rebuild the right data, but that doesn't seem to be enough now. Here's the status log of my pool: root@zfs:~# zpool status tank pool: tank state: FAULTED status: One or more devices could not be used because the label is missing or invalid. There are insufficient replicas for the pool to continue functioning. action: Destroy and re-create the pool from a backup source. see: http://zfsonlinux.org/msg/ZFS-8000-5E scan: none requested config: NAME STATE READ WRITE CKSUM tank FAULTED 0 0 1 corrupted data raidz1-0 ONLINE 0 0 8 sdd ONLINE 0 0 0 sdf ONLINE 0 0 0 sdh ONLINE 0 0 0 1298243857915644462 UNAVAIL 0 0 0 was /dev/sdb1 sde ONLINE 0 0 0 sdg ONLINE 0 0 0 Update (10/31): I tried to export and re-import the array a few times over the past week and wasn't successful. First I tried: zpool import -f -R /tank -N -o readonly=on -F tank That produced this error immediately: cannot import 'tank': I/O error Destroy and re-create the pool from a backup source. I added the '-X' option to the above command to try to make it check the transaction log. I let that run for about 48 hours before giving up because it had completely locked up my machine (I was unable to log in locally or via the network). Now I'm trying a simple zpool import tank command and that seems to run for a while with no output. I'll leave it running overnight to see if it outputs anything.

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  • iMac MXM Update Failing

    - by dmcollie
    Hi all iMac 24" Late 2006 Mac OS X (10.6.3) I'm trying to install Bootcamp. I've partitioned my HD but when I reboot with the Windows installation disk I get a black (blank) screen. The advice from the Apple Support website is to install the MXM Update but when I run that as per the instructions I get this error: An unexpected error occurred (11.1). Your firmware cannot be updated. Any ideas on how to proceed? Thanks.

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  • Extend volume where unallocated space lies ahead of it

    - by T3rm1
    I want to extend my volume. However the unallocated space lies ahead of the volume. Is it possible to extend this volume without converting it to a dynamic volume? I can't include images yet, so here you go: http://www.abload.de/img/unbenannttboxq.png I tried to use diskpart with the extend command but it doesn't work. Makes sense because the instructions says that the unallocated space has to be behind the volume.

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  • Does changing the default HDFS replication factor from 3 affect mapper performance?

    - by liamf
    Have a HDFS/Hadoop cluster setup and am looking into tuning. I wonder if changing the default HDFS replication factor (default:3) to something bigger will improve mapper performance, at the obvious expense of increasing disk storage used? My reasoning being that if the data is already replicated to more nodes, mapper jobs can be run on more nodes in parallel without any data streaming/copying? Anyone got any opinions?

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  • How to monitor streaming servers

    - by pcdinh
    Hi all, I have had a bunch of Linux based streaming servers that employed lighttpd web server to provide video streaming via port 80. Recently, our service is very slow. Therefore, I would like to ask if there is a good software package that helps us monitor and record our bandwidth usage, lighttpd established connections, TCP sync connections, disk I/O ... over time. Any suggestions? Regards, Dinh

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  • Blue Screen error BAD_POOL_CALLER 0x000000C2

    - by Adam
    My computer was working fine for months but now when it starts up the Windows XP screen comes up to show the computer is starting up but then a blue screen appears with the error below: BAD_POOL_CALLER STOP: 0x000000C2 (0x00000043, 0xDB3C6000, 0x00000000, 0x00000000) I have tried booting off the Windows XP CD and trying to do a re-installation but when the setup try's to query the disk the setup crashes and exists. I've run diags and that says everything is fine. Any ideas?

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  • restore -A usage

    - by Martin v. Löwis
    I have created a number of dump files using Linux dump(8), using the -A option to get a table of contents on disk (the backups are on tape). Now I'm trying to look into these archive files, using restore -i -A <archive>` However, this insists on asking what tape to use, and complains if I say none. What am I doing incorrectly? I was hoping that I can use these archive index files without having to insert the tape to use.

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  • Icons in windows 8 changed automatically

    - by Sidharth Vinod
    The icons of my folders in Windows 8 have changed automatically ! Now it is similar to that of the Unknown File Type icon. My C: drive icon and some icons in the Explorer-Home menu had also changed, but they became normal after a restart. But the folder icons (Medium Size) don't change. This is also seen in the "Save Dialog"-box. Please help, Thanks in advance... Here are the Images: (originals Image 1 , Image 2)

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  • Recover strategy single bad sector in moricon

    - by Damon
    This week, my harddisk made me an early christmas present in the form of a single defect sector. To make up for the puny size of the present, it chose a sector inside moricons.dll for that. This means that now the system takes about 5 minutes to boot before Windows gives up and moves on, and there's 2 dozen scary "critical failure" entries in the system log after every boot, which is annoying. OK, admittedly, I shouldn't complain, it could be worse, the bad sector could be in ntldr... SMART info more or less indicates (for what SMART can indicate anyway) that the drive is mostly OK. Soft Read Error Rate has a score of 96, and Current Pending Sector Count has a raw value of 8, which translates to a score of 100. Acronis DriveMonitor makes this an issue (lowering the overall rating to 75%), HDD Health calls it "excellent", giving an overall rating of 95% (which is what this harddisk from day one). No single score is below 95 (power on hours and spin up count), and most are 100 anyway. Well, whatever, I've seen drives with perfect SMART values fail from one second to the other, and drives with moderate values work for years. So, I'm inclined not to put too much weight into that overall. TL;DR Now... to the problem: I don't feel like trashing the disk just yet (that's planned with a new OS install upgrading to Win7 early next year, independently of this issue), but in the mean time, I would still like to have a smoothly running system again. Therefore, I feel tempted to tamper with it, but before I render my system entirely unusable (since I've never done this before), I'd like to verify that my planned procedere is likely to suceed in having a working system again: Copy moricons.dl_ from the Windows install disk, rename it to moricons.zip, and unzip it. This gives an intact 5.1.2600.2180 version (the broken one is 5.1.2600.5512 - but I guess this makes not much of a difference, since it's an icon-only DLL, and an outdated copy should work better than one that can't be read) Run chkdsk /r /f` which will "repair" the file (i.e. delete the file without asking, tell the drive to remap the sector, and toss some unreadable junk into a file with a hexadecimal number) Hopefully Windows still boots after this (is that a reasonable expectation, or do I need to have something like BartPE ready? -- but then again, what's that good for in case chkdsk has nuked the entire file system...) Delete the junk file generated by chkdsk, copy the new DLL to %windir%\system32 Reboot. Pray. Maybe I just shouldn't touch anything, since it still kind of works... if annoying, but it works. Unsure... But, is there anything fundamentally wrong with the planned approach? Is this a sensible approach at all?

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  • Exclude certain files or directories from redirected folders

    - by jao
    We have a windows 2003 AD and are using Folder redirection to redirect the users My Documents to a share. Is there a way to save certain filetypes (*.mp3, *.avi) or folders (My Music, My Pictures) on the user's hard disk instead of saving on the netwerk share? I'm aware of the GPO setting 'Exclude directories in roaming profile' but I'm not sure if that will do what I want (we're using redirected folders)

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  • iotop for Linux kernel 2.6.18

    - by Lightsauce
    So it has to come to my attention that iotop isn't availalbe for 2.6.18 since it's less than 2.6.20 and requires Python 2.6+. I've done some research and came across this article: http://lserinol.blogspot.com/2009/09/io-usage-per-process-on-linux.html According to this, if these process have io stats in /proc/pid#/io (where pid# is the process #) it's doable regardless of the kernel version. So, in reality, I could upgrade Python to 2.6 and test out iotop. However, my flavor of Linux, CentOS release 5.5 (Final), only supports Python 2.4.3-44.el5 currently. If I were to do uninstall from yum, it doesn't look so pretty. It ends up wanting to uninstall 235 packages, most of which are very important! I read in one place, online (I forget the URL from yesterday), that you can install Python 2.6+ parallel to this one, and have the rpm install for iotop use that. Well, I didn't choose that route. I figured, what the heck, lets write iotop (not copying it, but reverse engineering it without actually looking at it's code/it in use) in bash. I thought it would just grab the /proc/pid#/io file and parse stats. So I wrote a script to grab the top 10 rchar, wchar, read_bytes, and write_bytes by collecting all these stats from all the /proc/pid#/io files, sorting them by each metric, then grabbing the top 10 highest values. The conclusion, the data seems completely useless. Does anybody know any resources for advanced Linux where I can figure out how to take these /proc/pid#/ directories and figure out what the heck they are doing with io on the disk? My main goal is to figure out what exactly is causing high load on my disk. I just know it's on the / partition (/dev/sda2 in this case), and I'm not really sure how to narrow it down without the help of iotop. If I run iostat to grab metrics for 1 minute, every second, the first result it gives me shows a high 'kB_read/s', so that makes me think, it's reading mostly. However, if I watch the update it gives me every second, it's actually just showing values for kB_wrtn/s. This makes me think the initial value iostat gives me is misleading.

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