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  • Very slow disk performance on Dell PowerEdge 2950 w/ PERC 6/i running RAID 10

    - by vocoder
    I recently set up a server running Ubuntu 10.04 LTS on a Dell PowerEdge 2950 server - it has 6 500 gb 7200RPM SATA drives setup in a RAID 10 config. I am seeing extremely poor disk performance - the RAID array reports all disks are normal and using MegaCLI, it looks like the BBU is fine. hdparm -tT /dev/sda reports: Timing cached reads: 90 MB in 2.05 seconds = 43.96 MB/sec Timing buffered disk reads: 24 MB in 3.11 seconds = 7.72 MB/sec So as you can see, it takes forever to something as simple as an apt-get upgrade and even logging into the server. How do I go about troubleshooting what is causing this? I upgraded the firmware on the PERC 6i RAID controller to the latest, but didn't see any improvements.

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  • Boot linux off hard drive and then switch to run from usb flash disk

    - by Jesse
    I have an older laptop that I want to use as a simple media server on my home network. I would like to avoid using the internal hard drive except for booting (BIOS does NOT support booting from USB). My thought was to mirror the hard drive (currently has current install of Arch Linux) onto the flash drive and then after booting switch over to run everything from the flash drive. I read the following article about using a RAM disk (HOW-TO: Boot OS into RAM for speed and silence) but ran into problem because the USB subsystem does not seem to be initialized soon enough (I create root and home paritions on the flash disk and modified fstab to pick those - didn't work). Any thoughts?

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  • insert system disk error after switchting SATA cables

    - by Matthias
    I have 5 hard disks built in my computer, two connected by IDE cables, three by SATA. Today I had to return two of the SATA cables to my room mate. So I grabbed another one I had floating around and connected the remaining disk by unplugging my DVD R/W. Now I receive the 'insert system disk and press enter' error after booting. Disks and cables seem to be fine, since all the disks are recognized in the BIOS. Also, I can mount the disks using a live CD w/o problems. I also tried different orderings of the cables (i.e. plugging the disks in different plugs on the mainboard), I'm not sure if that even matters using SATA. Any Ideas what might be the problem here? The OS installed are Windows 7 and Ubuntu 10, the bootloader installed is GRUB. PS: No RAID involved, JBOD.

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  • How to encrypt disk transparently without destroying data

    - by aseq
    On a Linux system, be it Debian, Redhat or any distro, I would like to encrypt the disk on the fly. That is, encrypt the disk transparently to the OS whilst it is running, reboots, shuts down etc. In addition it should not destroy data. I know there is (commercial) software for windows that does it. But I need a Linux solution. The solutions I know of do not support this as far as I can see (luks, truecrypt...). Maybe there is some hack or work around available?

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  • Producer / Consumer - I/O Disk

    - by Pedro Magalhaes
    Hi, I have a compressed file in the disk, that a partitioned in blocks. I read a block from disk decompress it to memory and the read the data. It is possible to create a producer/consumer, one thread that recovers compacted blocks from disk and put in a queue and another thread that decompress and read the data? Will the performance be better? Thanks!

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  • .NET - A way to add my own clipboard format to existing formats

    - by A9S6
    I have a Excel addin that displays some structures on the worksheet. Users can copy the structures and paste them in another worksheet or another application which is handled by the Clipboard formats. When a user copies the structure, I convert the structure into a specific format and put it on the clipboard using the DataObject::SetData(). Please note that when a copy is initiated in Excel, it puts a number of formats on the clipboard (see image). The problem is that there is a third party application that depends on the data on the clipboard(Copy from Excel and paste into this 3rd party app) but the funny thing is that I am not sure which format it depends on. I need to preserve the existing formats that Excel has put up there and also add my own format to it. Currently when I use the Clipboard class in .NET (taking the DataObject and calling SetData inside it), all the other formats are replaced by new ones. I then tried to create a new DataObject, copy the existing format data to this data object and then set this data object in the Clipboard. This works fine but it takes time to copy the data. // Copying existing data in clipboard to our new DataObject IDataObject existingDataObject = Clipboard.GetDataObject(); DataObject dataObject = new DataObject(); string[] existingFormats = existingDataObject.GetFormats(); foreach (string existingFormat in existingFormats) dataObject.SetData(existingFormat, existingDataObject.GetData(existingFormat)); I am looking for a solution to just access the existing DataObject and quietly add my own data to it without affecting other formats. Excel Clipboard Formats - (Ignore the Native Format)

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  • Creating GPT partitions on EFI raw disk using diskpart

    - by kafka
    I've got a raw, blank GPT disk for use in a UEFI system. I need to create the partitions on it using diskpart. The only tutorial I've found so far is for diskpart.efi, which I believe is slightly different from the command-line diskpart. MS guide to GPT partitions with diskpart.efi Also the guide says to create a MSR of 32MB, but for a disk= 16GB I know it needs to be 128MB. I'm happy doing it with diskpart, just want to be sure I understand the fundamentals. I'm planning on installing, in this order: ESP partition, size 102 MB (create partition esp size=102) MSR partition, size 128 MB (create partition msr size=128) data partition, the remaining space (approx 460GB) Is this the correct thing to do, or is there anything I'm missing?

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  • Converting a Word document to LaTeX format

    - by Mehper C. Palavuzlar
    I'm preparing a book to be published and keeping everything in .docx files. Other than text the files include graphs (jpeg) and lots of equations typed in MathType. Since MS Word is not fully appropriate to balance text and shapes according to book format, some pages are having spacings at the bottom after some text, and then comes a shape on the next page. I know that LaTeX is very good at formatting, so is it possible to convert MS Word documents (or PDF documents, since I can easily convert them to PDF) into LaTeX format so that I can handle my work in LaTeX from now on?

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  • XEN disk mapping problem under opensolaris

    - by Louis
    I have a system with two harddisks, i wanted to use the simplicity of ZFS for my file server and i also need to run a linux. I choosed XEN virtualization for that, supported on both system. My GRUB is well configured and i can boot both system. I would like is to run both system with solaris as a dom0 and the debian installed on the 2nd HD as a virtual machine. My problem is that i want to use the partitions of my 1st harddisk (sda1 under linux) and it does not work. I didn't find my use case on the web- Here is my Opensolaris device name of this partition : /dev/rdsk/c7d0p1 But when i use : disk = [ 'phy:rdsk/c7d0p1,sda1,w' ] as a disk mapping in my XEN configuration file i have the error : Error: Device 2049 (vbd) could not be connected. error: "rdsk/c7d0p1" is not a valid block device. I am "lost".

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  • Resetting Mac OS X administrator password without a disk

    - by Simon Sheehan
    I'm currently in possession of an eMac G4 running OS X 10.4. I went to install some software, and found I didn't actually have the password. No one seems to know it, and it's not written down anywhere. These were purchased by the school many years ago and are not really maintained, since people just used Garageband mostly. I went to look for the restore disk, and its nowhere to be found. How can I reset the password without a disk?

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  • Format Factory not working for mov files

    - by LanguaFlash
    I have attempted multiple destination formats with no success. I am using Format Factor 2.30. I drag and drop a .mov file into FF, select all to mpg (or any format) then click Start. It thinks for a couple seconds and then jumps to 100%. When I open the file I get no sound or picture from the video. These mov files were created with a Canon SX10 camera. (It is my brother's camera so I'm not sure of the model.) Any suggestions? TMPGEnc is able to convert the files with the QTReader plug in so the video isn't corrupted or something. Thanks. Jeff

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  • How do I write a analyzable thread dump format

    - by gamue
    I'm creating a global exception handling which collects some information before shutting down in some cases. One of this information is the current thread dump. i do this with following code: ManagementFactory.getThreadMXBean().dumpAllThreads(true, true); The problem is to write the information into a analyzable format for TDA. Is there a "simple" way to format the information instead of writing the format on my own?

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  • HP ProBook 4540s CD/DVD Drive cannot Read Disks

    - by DavidB
    I seem to have a problem with the CD/DVD drive on my HP ProBook 4540s laptop. I cannot get it to read any disks. Normally, I would say that this is a hardware issue, but whenever I put a disk that previously could be read in the drive, it starts to make noise like it is trying to to read the disk but cannot and AnyDVD HD seems to be able to retrieve disk information with some struggle. Any ideas on what the problem could be?

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  • How do i pass arbitary date format from C# to sql backend

    - by Jims
    I have a datetime field for the transaction date in the back end. So I am passing that date from front C#.net, in the below format: 2011-01-01 12:17:51.967 to do this I have written: presentation layer: string date = DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss.fff", CultureInfo.InvariantCulture); PropertyClass prp=new PropertyClass(); Prp.TransDate=Convert.ToDateTime(date); PropertyClass structure: Public class property { private DateTime transdate; public DateTime TransDate { get { return transdate; } set { transdate = value; } } } From DAL layer passing the TransactionDate like this: Cmd.Parameters.AddWithValue("@TranSactionDate”, SqlDbType.DateTime).value=propertyobj.TransDate; While debugging from presntation layer: string date = DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss.fff", CultureInfo.InvariantCulture); in this I am getting correct expected date format, but when debugs goes to this line Prp.TransDate=Convert.ToDateTime(date); again date format changing to 1/1/2011. But my backend sql datefield wants the date paramter 2011-01-01 12:17:51.967 in this format otherwise throwing exception invalid date format. Note: While passing date as string without converting to datetime getting exceptions like: System.Data.SqlTypes.SqlTypeException: SqlDateTime overflow. Must be between 1/1/1753 12:00:00 AM and 12/31/9999 11:59:59 PM. at System.Data.SqlTypes.SqlDateTime.FromTimeSpan(TimeSpan value) at System.Data.SqlTypes.SqlDateTime.FromDateTime(DateTime value) at System.Data.SqlTypes.SqlDateTime..ctor(DateTime value) at System.Data.SqlClient.MetaType.FromDateTime(DateTime dateTime, Byte cb) at System.Data.SqlClient.TdsParser.WriteValue(Object value, MetaType type, Byte scale, Int32 actualLength, Int32 encodingByteSize, Int32 offset, TdsParserStateObject stateObj) at System.Data.SqlClient.TdsParser.TdsExecuteRPC(_SqlRPC[] rpcArray, Int32 timeout, Boolean inSchema, SqlNotificationRequest notificationRequest, TdsParserStateObject stateObj, Boolean isCommandProc)

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  • Strip my windows NTFS disk of all ACLs

    - by Alain Pannetier
    When you purchase a windows PC nowadays, you don't actually "own" the whole disk... There are so many ACLs on each folder that there are portions of it you actually can access only through a complex sequence of actions requiring skills well beyond the average PC user. You have to drill down to deeply buried dialog boxes accessible through concealed buttons. You have to understand at which level of the hierarchy you have to take ownership, remove ACLs etc... Yet when you think of it, that's your PC, that's what the "P" of PC originally stand for... So I'm toying with the idea of just stripping the disk of all ACLs I just purchased and leave standard file protections do the basic protection work... Just like previous century Windows used to do... (before I chmod -R 777 ;-) Has anybody done that already and nevertheless survived in reasonably good shape for a reasonable amount of time ? Any technical advice to do that ? Powershell script ? basic script using iCACLS ?

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  • What's the proper format for an SPF record?

    - by deltanovember
    Querying my domain I get: The TXT records found for your domain are: v=spf1 ip4:50.22.72.198 a mx:wordswithfriends.net ~all So superficially it appears OK. However I also get the following message SPF records should also be published in DNS as type SPF records. No type SPF records found. I want to make sure things are absolutely airtight. So in addition to TXT records I also want a pure SPF record. However I cannot figure out the format. Placing the same text in an SPF record does not seem to work. Edit: At the moment I have a TXT record but not SPF record. When I cut and paste from TXT straight to SPF I get some type of crazy recursive DNS error so quickly deleted the SPF. I just want to know the correct format. Copying v=spf1 ip4:50.22.72.198 a mx:wordswithfriends.net ~all Straight into an SPF record doesn't work.

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  • Proliant server will not accept new hard disks in RAID 1+0?

    - by Leigh
    I have a HP ProLiant DL380 G5, I have two logical drives configured with RAID. I have one logical drive RAID 1+0 with two 72 gb 10k sas 1 port spare no 376597-001. I had one hard disk fail and ordered a replacement. The configuration utility showed error and would not rebuild the RAID. I presumed a hard disk fault and ordered a replacement again. In the mean time I put the original failed disk back in the server and this started rebuilding. Currently shows ok status however in the log I can see hardware errors. The new disk has come and I again have the same problem of not accepting the hard disk. I have updated the P400 controller with the latest firmware 7.24 , but still no luck. The only difference I can see is the original drive has firmware 0103 (same as the RAID drive) and the new one has HPD2. Any advice would be appreciated. Thanks in advance Logs from server ctrl all show config Smart Array P400 in Slot 1 (sn: PAFGK0P9VWO0UQ) array A (SAS, Unused Space: 0 MB) logicaldrive 1 (68.5 GB, RAID 1, Interim Recovery Mode) physicaldrive 2I:1:1 (port 2I:box 1:bay 1, SAS, 73.5 GB, OK) physicaldrive 2I:1:2 (port 2I:box 1:bay 2, SAS, 72 GB, Failed array B (SAS, Unused Space: 0 MB) logicaldrive 2 (558.7 GB, RAID 5, OK) physicaldrive 1I:1:5 (port 1I:box 1:bay 5, SAS, 300 GB, OK) physicaldrive 2I:1:3 (port 2I:box 1:bay 3, SAS, 300 GB, OK) physicaldrive 2I:1:4 (port 2I:box 1:bay 4, SAS, 300 GB, OK) ctrl all show config detail Smart Array P400 in Slot 1 Bus Interface: PCI Slot: 1 Serial Number: PAFGK0P9VWO0UQ Cache Serial Number: PA82C0J9VWL8I7 RAID 6 (ADG) Status: Disabled Controller Status: OK Hardware Revision: E Firmware Version: 7.24 Rebuild Priority: Medium Expand Priority: Medium Surface Scan Delay: 15 secs Surface Scan Mode: Idle Wait for Cache Room: Disabled Surface Analysis Inconsistency Notification: Disabled Post Prompt Timeout: 0 secs Cache Board Present: True Cache Status: OK Cache Status Details: A cache error was detected. Run more information. Cache Ratio: 100% Read / 0% Write Drive Write Cache: Disabled Total Cache Size: 256 MB Total Cache Memory Available: 208 MB No-Battery Write Cache: Disabled Battery/Capacitor Count: 0 SATA NCQ Supported: True Array: A Interface Type: SAS Unused Space: 0 MB Status: Failed Physical Drive Array Type: Data One of the drives on this array have failed or has Logical Drive: 1 Size: 68.5 GB Fault Tolerance: RAID 1 Heads: 255 Sectors Per Track: 32 Cylinders: 17594 Strip Size: 128 KB Full Stripe Size: 128 KB Status: Interim Recovery Mode Caching: Enabled Unique Identifier: 600508B10010503956574F305551 Disk Name: \\.\PhysicalDrive0 Mount Points: C:\ 68.5 GB Logical Drive Label: A0100539PAFGK0P9VWO0UQ0E93 Mirror Group 0: physicaldrive 2I:1:2 (port 2I:box 1:bay 2, S Mirror Group 1: physicaldrive 2I:1:1 (port 2I:box 1:bay 1, S Drive Type: Data physicaldrive 2I:1:1 Port: 2I Box: 1 Bay: 1 Status: OK Drive Type: Data Drive Interface Type: SAS Size: 73.5 GB Rotational Speed: 10000 Firmware Revision: 0103 Serial Number: B379P8C006RK Model: HP DG072A9B7 PHY Count: 2 PHY Transfer Rate: Unknown, Unknown physicaldrive 2I:1:2 Port: 2I Box: 1 Bay: 2 Status: Failed Drive Type: Data Drive Interface Type: SAS Size: 72 GB Rotational Speed: 15000 Firmware Revision: HPD9 Serial Number: D5A1PCA04SL01244 Model: HP EH0072FARUA PHY Count: 2 PHY Transfer Rate: Unknown, Unknown Array: B Interface Type: SAS Unused Space: 0 MB Status: OK Array Type: Data Logical Drive: 2 Size: 558.7 GB Fault Tolerance: RAID 5 Heads: 255 Sectors Per Track: 32 Cylinders: 65535 Strip Size: 64 KB Full Stripe Size: 128 KB Status: OK Caching: Enabled Parity Initialization Status: Initialization Co Unique Identifier: 600508B10010503956574F305551 Disk Name: \\.\PhysicalDrive1 Mount Points: E:\ 558.7 GB Logical Drive Label: AF14FD12PAFGK0P9VWO0UQD007 Drive Type: Data physicaldrive 1I:1:5 Port: 1I Box: 1 Bay: 5 Status: OK Drive Type: Data Drive Interface Type: SAS Size: 300 GB Rotational Speed: 10000 Firmware Revision: HPD4 Serial Number: 3SE07QH300009923X1X3 Model: HP DG0300BALVP Current Temperature (C): 32 Maximum Temperature (C): 45 PHY Count: 2 PHY Transfer Rate: Unknown, Unknown physicaldrive 2I:1:3 Port: 2I Box: 1 Bay: 3 Status: OK Drive Type: Data Drive Interface Type: SAS Size: 300 GB Rotational Speed: 10000 Firmware Revision: HPD4 Serial Number: 3SE0AHVH00009924P8F3 Model: HP DG0300BALVP Current Temperature (C): 34 Maximum Temperature (C): 47 PHY Count: 2 PHY Transfer Rate: Unknown, Unknown physicaldrive 2I:1:4 Port: 2I Box: 1 Bay: 4 Status: OK Drive Type: Data Drive Interface Type: SAS Size: 300 GB Rotational Speed: 10000 Firmware Revision: HPD4 Serial Number: 3SE08NAK00009924KWD6 Model: HP DG0300BALVP Current Temperature (C): 35 Maximum Temperature (C): 47 PHY Count: 2 PHY Transfer Rate: Unknown, Unknown

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  • When and Where does Wubi mount it's virtual disks

    - by TuxPotato
    My use of the wubi-new-virtual-disk made Wubi start mounting this new virtual home disk over my /home folder. After the use of the script failed, I am left with Wubi constantly remounting an empty virtual disk over my /home folder. I followed the instructions on the Ubuntu website to revert the change, but the mounting continues. Where did Wubi put the mount operation, and how can I remove it? Thanks in advance!

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  • prevent OS X from prompting disk initialization/formatting

    - by Just-A-User.A-Superuser
    i have TrueCrypt partition, when i insert it in OS X, it always prompt me to initialize the hard disk. is there a way to prevent os x from detecting uninitialize hard disk? [UPDATE] by the way, as Truecrypt suggested while i'm in Windows, i must make partitions so the os won't detect the hard drive as uninitialized. Windows respected that the drive already have contents by the mere fact that it has partitions, while OS X thinks that it is still uninitialized. i think OS X is trying to be smart by detecting if each partition has a valid filesystem id/marker

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  • Why doesn't Windows 7 allow me to format?

    - by hydroparadise
    Dell support can be fun to deal with right? Ultimately, I have been going back and forth with Dell on an issue and came to reinstalling Windows 7 32-Bit Pro. The problem is that Windows Setup will not let me format. I've read other posts that say Windows 7 must installed on first partition here. But now that confuses me because the computer came shipped with the installation on the third partion as shown in the picture below? Is there a real problem? Or is this a Microsoftism? Should I obliterate the "OEM" partition to make this work? Please note that the format, delete, new, and extend options are grayed out.

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  • Run Wave Trusted Drive Manager from a bootable CD, recover crashed enrypted SSD?

    - by TigerInCanada
    Is there a way to run Wave Trusted Drive Manager from a live-cd to access a non-bootable SSD with Full Disk Encyption hard disk? http://www.wave.com/products/tdm.asp The crashed disk is a Samsung SSD PB22-JS3, 128Gb. Is has bad blocks at 128-block intervals. If the SSD password could be unset, is sending the unit for disaster recovery possible? What might cause a nearly new SSD to crash in this way, and what is the probability of it happening again? We have other units in service an I can do without every laptop disk in the company crashing...

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