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• Switch from encrypted partition to unencrypted (Error: cryptsetup: evms_activate is not available)

  - by Chris Lercher

  I initially installed Ubuntu 11.04 with an encrypted file system (from the alternate install CD: Guided Partitioning, LVM encrypted). Now I wanted to change this setup to have my root file system on an unencrypted partition. I had the following setup before: /dev/mapper/my-root on / type ext4 (rw,noatime,errors=remount-ro,commit=0,commit=0) /dev/sda1 on /boot type ext2 (rw,noatime) I backed up /, reformatted /dev/sda5 (which had contained the encrypted LVM device) to an ext3 partition, and restored / to that partition. I edited /etc/fstab, removed the line /dev/mapper/my-root / ..., and added the line: /dev/sda5 / ext3 noatime,rw,errors=remount-ro,commit=0 0 1 I edited /etc/crypttab, and commented out the single entry. On reboot, I get the grub screen as usual, but then I get the message cryptsetup:evms_activate is not available, waiting for encrypted source device. I tried reinstalling Grub2 using a LiveCD with the ChRoot method, but that didn't make any difference. Why is Ubuntu still searching for an encrypted device?

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• Triple-Boot + 4 partition Limit

  - by dsimcha

  I just bought a new hard drive so that I could convert my XP-only machine into an XP-Ubuntu-Windows 7 triple boot machine. Since the drive is absurdly huge (1 TB) I wouldn't mind throwing ReactOS into the mix, too. I just found out that master boot records are limited to 4 entries, meaning 4 primary partitions. I had Windows XP set up on my old drive as a boot partition, a program files partition and a media partition. Since I really didn't want to install XP from scratch, I cloned this setup on my new drive. This leaves me one MBR partition entry for installing Windows 7, Ubuntu and ReactOS. I'd like to avoid having to install XP from scratch like the plague, partly because it's supposed to be a safety net in case things go wrong with my other OS's and because I've invested a lot of time getting it set up exactly the way I like it. Here are the options I've considered and why I don't like them: Install Windows 7 on my media partition. This would work, but I prefer to keep my media partition completely separate from any OS, so that I can reformat an OS partition without affecting my media partition at all. Use wubi or something to install Ubuntu in the same partition as something else. Again, this is brittle. Move all my media to a logical drive on an extended partition. Create another logical drive on this extended partition for Ubuntu. The problem here is that extended partitions are rather brittle--if you nuke one, it renders the rest useless. Just put the old drive back in my computer and run XP off it. Use the new one for the other OS's. The problem here is that the old drive is slower and uses extra power, generates extra heat, etc. Can anyone suggest any other possibilities that I may have overlooked?

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• Can I install Natty alongside Maverick and retain my encrypted /home partition?

  - by Jon

  This is my partitioning scheme: 10GB partition empty -- will be installing Natty here 10GB partition containing Maverick 2GB swap partition 300GB encrypted /home partition I've had few problems in the past with having two ubuntu installs on two separate partitions, giving /home it's own partition, but I'm a little concerned since I'm now using an encrypted /home partition. Install won't try to wipe my /home if I click " encrypt home directory," will it?

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• Partition table corrupted (USB flash drive)

  - by 13ren

  It's an 8 GB Patriot thumb drive, which I've used extensively with lots of data. Today, it is detected, but all data is gone: (EDIT at least some data is still there, but the partition table is gone) EDIT @Sathya (thanks) here's the relevant output from sudo fdisk -l: Disk /dev/sdc: 8019 MB, 8019509248 bytes 247 heads, 62 sectors/track, 1022 cylinders Units = cylinders of 15314 * 512 = 7840768 bytes Disk /dev/sdc doesn't contain a valid partition table It looks like it is /dev/sdc, with that 8 GB... and no partition table. I tried to mount /dev/sdc (and then dmesg | tail): /media> sudo mount /dev/sdc mytmp mount: wrong fs type, bad option, bad superblock on /dev/sdc, missing codepage or other error In some cases useful info is found in syslog - try dmesg | tail or so /media> dmesg | tail [ 24.300000] sdc: unknown partition table [ 24.320000] sd 2:0:0:0: Attached scsi removable disk sdc [ 24.370000] usb-storage: device scan complete [ 26.870000] EXT2-fs error (device sdc): ext2_check_descriptors: Block bitmap for group 1 not in group (block 0)! [ 26.870000] EXT2-fs: group descriptors corrupted! [ 50.420000] unhashed dentry being revalidated: .DCOPserver_eeepc-brendanma__0 [ 50.430000] unhashed dentry being revalidated: .DCOPserver_eeepc-brendanma__0 [ 50.430000] unhashed dentry being revalidated: .DCOPserver_eeepc-brendanma__0 [ 5565.470000] EXT2-fs error (device sdc): ext2_check_descriptors: Block bitmap for group 1 not in group (block 0)! [ 5565.470000] EXT2-fs: group descriptors corrupted! EDIT @Col: results from testdisk Disk /dev/sdc - 8013 MB / 7642 MiB - CHS 1022 247 62 Current partition structure: Partition Start End Size in sectors Partition sector doesn't have the endmark 0xAA55 After I hit [proceed], it says: Structure: Ok. Keys A: add partition, L: load backup, Enter: to continue The "Structure: Ok." seems reassuring... will "A: add partition" make my old data accessible (if it's still there), or will it make a new, fresh partition? Another option is "[ MBR Code ] Write TestDisk MBR code to first sector" - would it be better to do this? EDIT I found that at least some of my data is still on the flash drive, by using the below, and searching for English text in less (like " the "): cat /dev/sde | tr -cd '\11\12\40\1540-\176' | less (The drive changed from "/dev/sdb" to "/dev/sde" because I connected some extra drives today). I've learnt that "/dev/sde1" would be the first partition; and "/dev/sde" is the whole drive. Because unix treats these devices just like files, you can use all the ordinary unix file commands on them, like cat, and then process them like any other stream of data. The tr above removes non-printable characters ("\40" is space, which I wanted to preserve). In less, you can use "/" to search, similar to Vim. How can I get my data back (assuming it's still there)? If only the partition table is corrupted, is there a standard "partition recovery tool"? Is there a way to "repartition" without deleting everything?

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• Strange error when Bootcamp attempts to create partition for Windows

  - by mozillalives

  I get a strange error when I tell Bootcamp to create a partition for Windows. I get to the Create a Partition stage. I select 20GB for Windows leaving 91GB (39GB free) for OS X. I then click Partition and it gives me the following error The disk cannot be partitioned because some files cannot be moved. Back up the disk and use Disk Utility to format it as a single Mac OS Extended (Journaled) volume. Restore your information to the disk and try using Boot Camp Assistant again. My disk is formatted in Mac OS Extended (Journaled), I have closed all applications (besides Bootcamp Assistant) and I have even restarted and tried again to see if that might help. Nothing. I can't get it to partition. I also tried to create the partition using Disk Utility and I got the following error Partition failed Partition failed with the error: Could not modify partition map because filesystem verification failed Any ideas? BTW - I am running OS X 10.6.2

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• what's the difference between a Volume and a Partition in Windows 7 diskpart

  - by user170232

  I was trying to follow the Intel guide for setting up iRST (Intel Rapid Start Technology) on my new laptop. The Intel manual says you need to create a *Volume that is as big or bigger than your available memory, set it to a specific id (id=84), then go into the iRST tool and adjust some settings. Looking at the disk manager on the laptop, I see there is already a Partition labeled as "Hibernation Partition" which is a little bigger than the memory in my system. So it looks like iRST was already set up...BUT, it's a Partition, not a Volume. Here's what the manual says to do: (from: http://download.intel.com/support/motherboards/desktop/sb/rapid_start_technology_user_guide.pdf) diskpart list disk select disk x (where x is the disk to use, there's only one disk in this laptop) create partition primary size=X000 (where X000 is the size to create) detail disk (which lists details for the disk. This is where i get hung up) select volume Z (where Z is the *partition you created previously) ** it says the 'detail disk' command will list the volume #, but it doesn't. ** 'detail disk' only lists two "volumes" for Recovery and OS. ** if i do 'list partition', i see the 8 GB *partition labeled as "Hibernation Partition") ** so I can't continue with the following steps: set id=84 override exit The reason I went looking for the manual is because when iRST is enabled in the BIOS, the system won't resume from sleep. When it's disabled, it works fine, but the system goes into (legacy?) Hibernation mode and takes a while to come out of Hibernation. the iRST is supposed to resume from deep sleep very quickly. So, what's the difference between a Volume and a Partition? Should I delete the Hibernation Partition and create a Hibernation Volume? Anyone have any ideas? (if it matters, this is on a Dell XPS 13 with BIOS A08) Thanks! J

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• Active Directory Partition Error

  - by BLAKE

  Right now my active directory is failing a dcdiag test. I can find no info online about this error. When I run dcdiag /test:crossrefvalidation, I get the output: .... Doing primary tests Testing server: Default-First-Site-Name\ad01 Running partition tests on : ForestDnsZones Starting test: CrossRefValidation ......................... ForestDnsZones passed test CrossRefValidation Running partition tests on : DomainDnsZones Starting test: CrossRefValidation ......................... DomainDnsZones passed test CrossRefValidation Running partition tests on : Schema Starting test: CrossRefValidation ......................... Schema passed test CrossRefValidation Running partition tests on : Configuration Starting test: CrossRefValidation ......................... Configuration passed test CrossRefValidation Running partition tests on : mydomain Starting test: CrossRefValidation ......................... mydomain passed test CrossRefValidation Running partition tests on : t Starting test: CrossRefValidation This cross-ref has a non-standard dNSRoot attribute. Cross-ref DN: CN=a3a24d3a-4782-460b-9148-86ac2d86b9ae,CN=Partitions,CN=Configuration, DC=mydomain,DC=com nCName attribute (Partition name): DC=t Bad dNSRoot attribute: dc01.mydomain.com Check with your network administrator to make sure this dNSRoot attribute is correct, and if not please change the attribute to the value below. dNSRoot should be: t It appears this partition (DC=t) failed to get completely created. This cross-ref (CN=a3a24d3a-4782-460b-9148-86ac2d86b9ae,CN=Partitions,CN=Configurat ion,DC=mydomain,DC=com) is dead and should be removed from the Active Directory. ......................... t failed test CrossRefValidation .... I used LDP from the windows support tools. I searched for the dnsRoot attribute in "cn=partitions,cn=configuration,dc=mydomain,dc=com", with the filter "(&(objectcategory=crossref)(systemFlags:1.2.840.113556.1.4.803:=5))" I got the result: ***Searching... ldap_search_s(ld, "cn=partitions,CN=Configuration,DC=mydomain,DC=com", 1, "(& (objectcategory=crossref)(systemFlags:1.2.840.113556.1.4.803:=5))", attrList, 0, &msg) Result <0>: (null) Matched DNs: Getting 3 entries: >> Dn: CN=65502be3-fc90-442a-83d8-4b3b91e82439,CN=Partitions,CN=Configuration,DC=mydomain,DC=com 1> dnsRoot: ForestDnsZones.mydomain.com; >> Dn: CN=a3a24d3a-4782-460b-9148-86ac2d86b9ae,CN=Partitions,CN=Configuration,DC=mydomain,DC=com 1> dnsRoot: ad01.mydomain.com; >> Dn: CN=f0ef5771-6225-4984-acd9-c08f582eb4e2,CN=Partitions,CN=Configuration,DC=mydomain,DC=com 1> dnsRoot: DomainDnsZones.mydomain.com; It looks like the bad partition has the name of my first domain controller 'ad01.mydomain.com'. I have googled for a while and have not been able to find any help or documentation about application partitions in Active Directory. Does anyone have any advice on how to cleanup this partition (or what the partition is for)? Does anyone know the repercussions for deleting this partition?

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• Setup was unable to create a new system partition or locate an existing system partition

  - by PearlFactory

  Have got a new kickn server as new DEV machine It has got two 3ware 9650 Cached Controllers with 8 x 300gig Velociraptor Drives First Problem was the 9.5.1.1 drivers Had to press F8 as soon as the Win 2008 r2 server cd started to load. Once in Adavanced Startup options Disable Driver Signing options Next Issue was I got everything running and accidently selected wrong raid part to do install once I restarted All I would get after waiting the 10 mins for the reboot to start & loading the driver was "setup was unable to create a new system partition or locate an existing system partition"  Finally after about 1 hour I removed all drives apart from the 2 needed for system part on cont 0 deleted system part and recreated this RAID1 mirror. (ALso make sure all USB drives are out on boot..only add them when browsing  the driver to be added )  Restarted loaded driver selected install and Once system is up I will go back and add drives and new parts on both controllers AT least I did not get stuck for a day as is the norm..lol

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• repair partition table

  - by m.sr

  Hallo. I've just overwritten my partition table of my system's hard disk. i made a cfdisk on the wrong device (/dev/sda instead of /dev/sdd), deleted all partitions, made one new primary spanning over the whole device, set its type to 07 (NTFS) and hit write. So here i am with my system running. Until i reboot, i hope/guess nothing will change - meaning: all my data is accessible (I'm currently making a dd-backup of the whole device and plan to make a .tar.gz-backup of the most important data later). I also backed up /proc/partitions, /proc/diskstats (even though i guess this is more about throughput and stuff like this ...) and /sys/block/sda/sda?/{start,size}. Some further things i know: 4 primary partitions 1st partition: ~100Mb, ext3, /boot 2nd partition: ~100Mb, "Win7 Boot Partition", ntfs(?) 3rd partition: ~20...30GB, Win7, ntfs 4th partition: ~20...30GB, luks-encrypted device The luks- de crypted device is a LVM-PV The /, /home & swap-partitions are all LVs on the (VG on the) above noted PV So my questions: What is the simplest way to just write the kernels partition table to the disk? What is the simplest way to take the above mentioned (and perhaps other I don't know of ...) data and generate the partition table? Are there any problems to take care of regarding to luks and/or lvm? Is there any data I should backup before rebooting (meanig stuff from kernel [ /sys/..., /proc/...] and so on, which could help me regenerate the partition table)? Thanks a lot! P.S.: debian sid, Kernel 2.6.34-1-amd64 from debian-experimental, 80GB Intel SSD

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• linux hardware raid 10 / lvm / virtual machine partition alignment and filesystem optimization

  - by Jason Ward

  I've been reading everything I can find about partition alignment and filesystem optimization (ext4 and xfs) but still don't know enough to be confident in setting up my current configuration. My remaining confusion comes from the LVM layer and if I should use raid parameters on the filesystem in guest os'es. My main questions are: When I use 'pvcreate --dataalignment' do I use the stripe-width as calculated for a filesystem on RAID (128kB for ext4 in my situation), the Stripe size of the RAID set (256kB), something else altogether, or do I not need this? When I create ext2/3/4 or xfs filesystems in guests on the Logical Volumes, should I add the settings for the underlying RAID (e.g. mkfs.ext4 -b 4096 -E stride=64,stripe-width=128)? Does anyone see any glaring errors in my set up below? I'm running some benchmarks now but haven't done enough to start comparing results. I have four drives in RAID 10 on a 3ware 9750-4i controller (more details on the settings below) giving me a 6.0TB device at /dev/sda. Here is my partition table: Model: LSI 9750-4i DISK (scsi) Disk /dev/sda: 5722024MiB Sector size (logical/physical): 512B/512B Partition Table: gpt Number Start End Size File system Name Flags 1 1.00MiB 257MiB 256MiB ext4 BOOTPART boot 2 257MiB 4353MiB 4096MiB linux-swap(v1) 3 4353MiB 266497MiB 262144MiB ext4 4 266497MiB 4460801MiB 4194304MiB Partition 1 is to be the /boot partition for my xen host. Partition 2 is swap. Partition 3 is to be the root (/) for my xen host. Partition 4 is to be (the only) physical volume to be used by LVM (for those who are counting, I left about 1.2TB unallocated for now) For my Xen guests, I usually create a Logical Volume of the needed size and present it to the guests for them to partition as needed. I know there are other ways of handling that but this method works best for my situation. Here's the hardware of interest on my CentOS 6.3 Xen Host: 4x Seagate Barracuda 3TB ST3000DM001 Drives (sector size: 512 logical/4096 physical) 3ware 9750-4i w/BBU (sector size reported: 512 logical/512 physical) All four drives make up a RAID 10 array. Stripe: 256kB Write Cache enabled Read Cache: intelligent StoreSave: Balance Thanks!

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• Testdisk won’t list files for an ext4 partition inside a LVM inside a LUKS partition

  - by user1598585

  I have accidentally deleted a file that I want to recover. The partition is an ext4 partition inside an LVM partition that is encrypted with dm-crypt/LUKS. The encrypted LUKS partition is: /dev/sda2 which contains a physical volume, with a single volume group, mapped to: /dev/mapper/system And the logical volume, the ext4 partition is mapped to: /dev/mapper/system-home A # testdisk /dev/mapper/system-home will notice it as an ext4 partition but tells me that the partition seems damaged when I try to list the files. If I # testdisk /dev/mapper/system it will detect all the partitions, but the same happens if I try to list their files. Am I doing something wrong or is it a known bug? I have searched but haven’t found any clue.

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• Combine OS partion with data partition on NAS4Free/FreeNAS

  - by Pak

  I recently built a NAS4Free (formerly FreeNAS) machine using a 256MB (yes, MB) USB drive for the OS. When I did the original install, I had the bright idea of making the OS partition just big enough for the OS and a then creating a second partition using the remainder of the drive to store stuff pertaining to the OS. I never really found a use for the data partition and I ended up running out of space on the OS partition, so now I'd like to combine the partitions into a single partition. Is this something that is possible to do while everything is up and running? If it comes down to it, I can take down the machine and do a fresh install of the OS using the entire space of the USB drive, but I'd like to use this as an opportunity to better familiarize myself with FreeBSD/UNIX type systems. If this is possible, will it interfere with the NAS4Free things? The data partition shows up in the web interface under the disks section. If I end up manually changing the partitions, I'd be concerned with NAS4Free getting confused by the missing partition.

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• Ubuntu 10.04 preseed unattended install results in faulty partition table

  - by joschi

  I'm currently trying to set up an unattended installation of Ubuntu 10.04 (Lucid Lynx) through preseeding. But whenever I try to create a custom partition scheme, the Debian installer (which Ubuntu is using) produces a faulty partition table. I've taken the partition scheme described in the example preseed file: d-i partman-auto/expert_recipe string \ boot-root :: \ 40 50 100 ext3 \ $primary{ } $bootable{ } \ method{ format } format{ } \ use_filesystem{ } filesystem{ ext3 } \ mountpoint{ /boot } \ . \ 500 10000 1000000000 ext3 \ method{ format } format{ } \ use_filesystem{ } filesystem{ ext3 } \ mountpoint{ / } \ . \ 64 512 300% linux-swap \ method{ swap } format{ } \ . Unfortunately it also produces an incorrect partition table on the disk. The installation process itself is working and the installed system eventually boots and is working, as far as I can tell. But fdisk and cfdisk are still complaining: # fdisk -l /dev/sda Disk /dev/sda: 17.2 GB, 17179869184 bytes 255 heads, 63 sectors/track, 2088 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: 0x000a1cdd Device Boot Start End Blocks Id System /dev/sda1 * 1 5 37888 83 Linux Partition 1 does not end on cylinder boundary. /dev/sda2 5 2089 16736257 5 Extended /dev/sda5 5 2013 16121856 83 Linux /dev/sda6 2013 2089 613376 82 Linux swap / Solaris cfdisk even refuses to start at all: # cfdisk /dev/sda FATAL ERROR: Bad primary partition 1: Partition ends in the final partial cylinder parted on the other hand does not complain about the cylinder boundary of /dev/sda1: # parted /dev/sda p Model: VMware Virtual disk (scsi) Disk /dev/sda: 17.2GB Sector size (logical/physical): 512B/512B Partition Table: msdos Number Start End Size Type File system Flags 1 1049kB 39.8MB 38.8MB primary ext4 boot 2 40.9MB 17.2GB 17.1GB extended 5 40.9MB 16.5GB 16.5GB logical ext4 6 16.6GB 17.2GB 628MB logical linux-swap(v1) Since the installed system is working, it shouldn't be a big problem but I'm afraid that this will mean trouble in the future.

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• re-partition new drive and use new partition as 'home'

  - by vector

  Linux noob here. I installed Ubuntu 12.04 on a brand new drive (dual boot with windows on another drive) and re-partitioned it afterwards (with gparted off of live cd) like so (sudo fdisk -l) : Device Boot Start End Blocks Id System /dev/sdb1 * 2048 63735807 31866880 83 Linux /dev/sdb2 1448509438 1465147391 8318977 5 Extended Partition 2 does not start on physical sector boundary. /dev/sdb3 63735808 1448507391 692385792 83 Linux /dev/sdb5 1448509440 1465147391 8318976 82 Linux swap / Solaris I'd like to use sdb3 as default home for all work and fun related program installs and files, but I haven't even gotten as far as changing permissions on it. Any help will be most appreciated.

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• Windows 7: moved system partition, need to update boot partition

  - by Actorclavilis

  So, I have a decently standard Windows7/Ubuntu dual-boot setup, and (since Ubuntu is my usual operating system) I found I needed to grow my Ubuntu partition and shrink my W7 partition. Originally, my system (500G) looked like this: W7 Boot Partition (1.5G) Ubuntu (around 240G) W7 (same as Ubuntu) (on an extended partition, all by itself) Swap (rest of disk, around 16G) Now I'm no stranger to partitioning and filesystem tools, especially GParted, which I used on a Linux boot disk. After my partition editing, the partitions are laid out the same, except the Ubuntu partition is now 407G and the W7 partition is smaller to compensate. I had supposed, based on http://www.gparted.org/faq.php, that I would be able to run the W7 install disk in recovery mode and have it deal with the rearrangement, then possibly reinstall GRUB or something. Well, now the W7 install disk doesn't even see my W7 installation. All my files are there, the NTFS is perfectly clean, no problems there, but the install disk won't notice it. (Of course, the GRUB entry works fine but the W7 boot partition (which I didn't change) refuses to boot it.) So, basically, any ideas on how to fix this? I don't especially want to rerun the entire install procedure because I'll have a bunch of programs to reinstall (never mind redoing GRUB), but I fear that might be the only option. Thanks.

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• Recover an HP recovery partition

  - by eric.chartier

  I have a (semi)-dead hard drive with an HP recovery partition on it. My goal is to Buy a new hard drive Copy the recovery partition to a drive ( dd if=/dev/sdb1 of=~/recovery.bak ) Make a new partition of 12000 mb with Windows 7 Copy back recovery partition to the new drive ( dd if=~/recovery.bak of=/dev/sdb1 ) Then press F11 when the laptop boots. However, this doesn't work. Any idea why? Edit: I suspect the F11 doesn't work because the laptop tries to boot the laptop, because my partition is the primary partition of the drive. Does anyone have any experience dealing with stuff like this?

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• Can't boot after Deleted System Reserved Partition

  - by mauris

  I accidentally deleted the System Reserved Partition and now I can no longer boot into Windows 7. The installation of Windows and all my files still exists in the partition, but without the System Reserved Partition I can no longer boot. After I deleted the System Reserved Partition I moved left the primary partition to fill the space. Is there any way I can "reinstall" that System Reserved Partition and the boot files? PS: I only have Windows 7 installed. No dual-boot nothing.

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• Partition table damaged

  - by emaster70

  Hello, I'm currently in a terrible situation with my hdd: I was trying to install an OS side by side with my windows 7 x64 and I used the Paragon Partition Manager feature made for that. It disabled/hid/(damaged?) one of my partitions and now I can no longer access it. The partition, unfortunately, contains data I need to access urgently and I've got no backup. To complicate things even further I don't have another PC (I'm writing this msg from my iphone) and all I can rely on is a backtrac 4 disk (wkn't connect to my wifi, gets stuck obtaining IP address) and. Windows 7 x64 disk. Booting into windows fails with the pc hanging on the starting windows screen. Safe mode won't work either. Is there anything I can do? Here's the layout of the disk: Recovery partition Win partition Unallocated space (it's supposed to be my data partition) Other os partition (don't care about that, the installation of the other OS failed) Please help me, I'm desperate.

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• Partition Wise Joins II

  - by jean-pierre.dijcks

  One of the things that I did not talk about in the initial partition wise join post was the effect it has on resource allocation on the database server. When Oracle applies a different join method - e.g. not PWJ - what you will see in SQL Monitor (in Enterprise Manager) or in an Explain Plan is a set of producers and a set of consumers. The producers scan the tables in the the join. If there are two tables the producers first scan one table, then the other. The producers thus provide data to the consumers, and when the consumers have the data from both scans they do the join and give the data to the query coordinator. Now that behavior means that if you choose a degree of parallelism of 4 to run such query with, Oracle will allocate 8 parallel processes. Of these 8 processes 4 are producers and 4 are consumers. The consumers only actually do work once the producers are fully done with scanning both sides of the join. In the plan above you can see that the producers access table SALES [line 11] and then do a PX SEND [line 9]. That is the producer set of processes working. The consumers receive that data [line 8] and twiddle their thumbs while the producers go on and scan CUSTOMERS. The producers send that data to the consumer indicated by PX SEND [line 5]. After receiving that data [line 4] the consumers do the actual join [line 3] and give the data to the QC [line 2]. BTW, the myth that you see twice the number of processes due to the setting PARALLEL_THREADS_PER_CPU=2 is obviously not true. The above is why you will see 2 times the processes of the DOP. In a PWJ plan the consumers are not present. Instead of producing rows and giving those to different processes, a PWJ only uses a single set of processes. Each process reads its piece of the join across the two tables and performs the join. The plan here is notably different from the initial plan. First of all the hash join is done right on top of both table scans [line 8]. This query is a little more complex than the previous so there is a bit of noise above that bit of info, but for this post, lets ignore that (sort stuff). The important piece here is that the PWJ plan typically will be faster and from a PX process number / resources typically cheaper. You may want to look out for those plans and try to get those to appear a lot... CREDITS: credits for the plans and some of the info on the plans go to Maria, as she actually produced these plans and is the expert on plans in general... You can see her talk about explaining the explain plan and other optimizer stuff over here: ODTUG in Washington DC, June 27 - July 1 On the Optimizer blog At OpenWorld in San Francisco, September 19 - 23 Happy joining and hope to see you all at ODTUG and OOW...

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• Help in recovering partition

  - by goshopedero

  Okay so i had one NTFS partition and i wanted to resize it, but while resizing it with partition magic some error occurred and now i am not able to enter in my partition anymore. I have slackware 13 also and i tried mounting the partition from there but it didn't succeed. One friend of mine came to my house with some live-cd os called backtrack3 and when he booted from cd, he was able to mount the damaged partition - and was able to read/write on it anywhere. I saw my files, they are all there, so nothing's erased just the partition is somehow damaged. But strange thing was that from backtrack we weren't able to mount some of the working partitions of my comp, and we could mount the damaged one. So i am asking for some help here: My files are all there, and i saw them from backtrack. What can i do to fix the partition so it would be usable from windows/slackware again ? Please tell me anything you've got because i have some important data on it. Thank you.

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• Copying Windows 7 system onto Mac Pro partition?

  - by BEATFROMBRAIN

  Instead of installing a new Windows 7 system onto a mac pro partition, is it possible to copy over my complete Windows 7 system directly onto the partition, and get it to run? I just bought the mac pro, and it's running OSX 10.6... Copied from a comment: I wish to make a windows partition on the mac pro startup disk, but instead of installing windows, was wondering if I can copy over from my pc laptop byte for byte my windows system into said partition, and successfully run it

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• Recover an HP recovery partition from an offline drive

  - by eric.chartier

  I have a (semi)-dead hard drive with an HP recovery partition on it. My goal is to 1-Buy a new hard drive (checked) 2-Copy the recovery partition to a drive ( dd if=/dev/sdb1 of=~/recovery.bak ) 3-Make a new partition of 12000 mb with Windows 7 4-Copy back recovery partition to the new drive ( dd if=~/recovery.bak of=/dev/sdb1 ) Then press F11 when the laptop boots however it does NOT work. Any idea why? It seemed quite fool proof...

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• Cannot assign a letter to a FAT32 partition

  - by Toc

  I have an external hard disk where I have created many partitions to use also in Linux. First two partitions are FAT32. The third is a Truecrypt partition. I cannot assign a letter to the second partition. When I go to Manage disk and right-click on the unassigned partition, most of the options are not enabled. What have I to do to see this partition on my XP PC?

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• Transform a NTFS partition type into EISA

  - by doug

  hi there Some time ago I've installed windows 7 on my laptop which has a EISA partition with MS Vista. I really don't remember what I did(I'm silly i Know) but now, that EISA partition has NTFS type but is also hidden. Does anyone knows how can I make that NTFS partition into a EISA partition type, as it was build when I've buyed the laptop? TY

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• Copy the contents of one partition to another partition hardrive

  - by user35319

  if i write this command in linux "dd if=/dev/sda1 of=/dev/sda2" it will copy the whole /dev/sda1 partition bit by bit to /dev/sda2 ......is there any way in WINOWS not in linux that i can just only copy the contents of one partition to another partition not the whole partition.....

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