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Mirror (computing) - Wikipedia, the free encyclopedia Mirror sites are most commonly used to provide multiple sources of the same information, and are of particular value as a way of providing reliable access to large downloads. Mirroring is a one-way operation whereas file synchronization is two-way. If one server is extremely popular a mirror may help relieve this load: for example if a Linux distribution is released as an ISO image onto the distribution developer's own server, this server may become overloaded with demand. en.wikipedia.org /wiki/Mirror_(computing)   (686 words)

Disk mirroring - Wikipedia, the free encyclopedia In data storage, disk mirroring or file shadowing is the replication of data on separate disks in real time to ensure continuous availability, currency and accuracy. Mirroring is a common function found in enterprise storage and RAID devices. Some mirroring schemes employ three disks, with two of the disks for the redundancy mirroring and the third to be split off for performing backups. en.wikipedia.org /wiki/Disk_mirror   (370 words)

Disk I/O Tuning RAID Technology Disk Stripping Shadowing Mirroring As its name implies, disk shadowing or mirroring is the process whereby each disk has a shadow or mirror disk that data is written to simultaneously. Once the disk is brought back on-line, the shadow or mirror process brings it back in sync by a process appropriately called “resilvering.” This also allows for backup since the shadow or mirror set can be broken (e.g., the shadow separated from the primary), a backup taken, and then the set resynchronized. In figure 4-2 disk group A is considered the active group, disk group B is the "mirror" group. www.rampant-books.com /disk_119.htm   (319 words)

Daemon News '200502' : '"FreeBSD System Disk Mirroring "'   (Site not responding. Last check: 2007-10-21) Unfortunately, it works only if the two disks are really equal in size or, at least, requires that the mirror is established on the smaller disk first and that extra space is lost on the second disk. This is a little bit less obvious, but provides a lot more flexibility and allows the usage of disks of different sizes and the possibility to make use of the disks' remaining space (either for a second mirror or as plain partitions). The assumption is that the two disks are equal in size or that the second disk is a little bit smaller than the first one. ezine.daemonnews.org /200502/diskmirror.html   (1132 words)

PRS Technologies, Inc. - hp_mirror_bootdisk.sh By using mirror copies of the root or primary swap logical volumes on another disk, you will be able to use the copies to keep your system in operation, if either of these logical volumes fail. Mirror the boot logical volume, primary swap logical volume, root logical volume and other logical volumes as needed, to the mirror disk in the correct sequence The primary swap mirror does not need to be on a specific disk or at a specific location, but it does need to be allocated on contiguous disk space. www.peterschmidt.com /src/hp_mirror_bootdisk.shtml   (689 words)

SoftRAID Support Page Disks initialized with Apple Disk Utility or SoftRAID 2.x which have volumes with data that you want to keep can be converted to SoftRAID 3 volumes, with the Convert to SoftRAID 3 command in the Disk menu. To detect which disk has failed, you can try copying a large file to or from the volume and seeing which disk is blinking (working) and which disk isn’t (failed). Mirror volumes can contain a Mac OS X system and be used as a startup volume. www.softraid.com /usingmanualb.html   (1888 words)

Jerry Jelinek's Weblog : Weblog   (Site not responding. Last check: 2007-10-21) If the primary disk is once again made available and then you reboot without first resyncing the mirror back onto the primary drive, then you should use the GRUB menu entry for the second disk to manually boot from the correct boot archive (the one on the secondary side of the mirror). For example, if the disk was on one side of a mirror, you would have had to detach the submirror, delete it, DR out the disk, DR in the new one, recreate the submirror and reattach it to the mirror. With root mirroring, a common test is to pull the primary boot disk and reboot to verify that the system comes up properly on the other side of the mirror. blogs.sun.com /jerrysblog   (8652 words)

Using Mirroring to Move Devices to a Larger Partition - Sybase Inc This document describes using SQL Server disk mirror to move devices to a different or larger partition after the disk has been repartitioned. There are four stages to move the master device out and back to the same disk after the disk has been repartitioned. There are four stages to move the devices out and back to the same disk after the disk has been repartitioned. www.sybase.com /detail?id=2870   (844 words)

Cannot Create Software Mirror If Disk Contains Bad Blocks If the disk that contains bad blocks is an integrated device electronics (IDE) disk, you must back up the data and then replace the disk with a new IDE disk before you establish the mirror. In the Add Mirror case where the bad sector is on the source disk, the bad sector number from the source disk is recorded in the bad sector list but is never written to. In the Add Mirror case where the bad sector is on the destination disk, the write failure does not add the bad sector number to the bad sector list. support.microsoft.com /default.aspx?scid=kb;en-us;325615   (1242 words)

Novell Documentation: NetWare 5.1 - Mirroring and Duplexing Partitions The term mirroring is used in all menus to refer to both mirroring and duplexing. Note that mirroring can take a long time to complete, depending on the size of the partitions and the amount of data to be mirrored. Mirroring can take a long time, depending on the size of the partitions and the amount of data to be mirrored. www.novell.com /documentation/nw51/sdiskenu/data/hyjb6x9u.html   (1085 words)

FreeBSD System Disk Mirroring I currently prefer GEOM mirror for establishing such a RAID-1 solution for the system disk partitions because it both provides the possibility to directly boot from the mirror without tricks and is a really clean and modern solution. Unfortunately is works only if the two disks are really equal in size or at least requires that the mirror is established on the smaller disk first and that space is lost on the second disk. This is a little bit less obvious, but provides a lot more flexibility and especially allows the usage of disks of different size plus the possibility to still use (either for a second mirror or as plain partitions) the unused space on the disks. people.freebsd.org /~rse/mirror   (1167 words)

Duke Mag-Sep,Oct 2001-Obsidian Mirror Disk-Gallery He also often wore a large mirror on his head or chest, as is known from ancient Mesoamerican paintings (see accompanying illustration from the ancient Codex Borgia for an image of Lord Tezcatlipoca depicted with obsidian disks on chest and foot). Both reflective and translucent, the obsidian mirror was seen as a threshold between two worlds, with the obsidian conceptualized as a membrane or tissue separating this earthly world from the beyond. Another obsidian mirror comparable to the one in the DUMA collection was published recently in Burlington Magazine, confirming the museum’s research and suggesting the potential importance of the origins of the DUMA piece. www.dukemagazine.duke.edu /dukemag/issues/091001/depgall.html   (603 words)

Adding a Mirror to a Volume The volume Add Mirror procedure creates a mirror (copy) of a volume on a disk that is not already being used by the volume. To place the mirror on a specific disk, select Manually select disks for use by this volume, and assign the destination disks for the mirrors. Only disks in the same disk group as the volume can be used to create the new mirror. docs.hp.com /en/5991-0613/ch04s07.html   (439 words)

DOS Command: MIRROR Purpose: Used to store information about a disk`s file allocation table, boot record, and root directory (to be used later for file recovery). The MIRROR command is used to save information that can be used later for file recovery using the UNDELETE and UNFORMAT commands. MIRROR creates a duplicate or MIRROR of this important information in case the original information becomes unreadable. www.csulb.edu /~murdock/mirror.html   (287 words)

Solaris Tips - Solstice Disk Suite   (Site not responding. Last check: 2007-10-21) The partition table of the mirrored drive should be identical to the boot drive. In this case c0t0d0s2 is the boot drive and c0t1d0s2 is the mirror. Edit the /etc/vfstab to mount the new mirrors on boot. www.manucomp.com /solaris_tips/solstice_disk_suite.html   (537 words)

Mirroring a Disk The Mirror Disk procedure mirrors (copies) all concatenated and striped volumes on a disk onto another disk. Only concatenated and striped volumes that reside on a single disk are mirrored onto the other disk. Only disks in the same dynamic disk group can be used to create the new mirrors. docs.hp.com /en/5991-0613/ch03s10.html   (196 words)

How to create a floppy boot disk in Windows A boot disk is a floppy or a CD that you can use to boot your computer into a state in which you can use it to fix a problem. With that said, it is a good thing to have a boot disk pre made and ready in case there is a problem with starting Windows in the future. Now that the boot disk has been completed you should remove the disk, label it as a boot disk, and store it in a safe location for when it is needed. www.bleepingcomputer.com /tutorials/tutorial108.html   (841 words)

Twincom - Network Disc Mirror. Network Mirroring By redirecting the users to the alternate CPU (as simple as a keystroke or flipping a switch), data accessibility is maintained with minimum interruption should the primary computer fail. In the event of a disk failure, the system immediately notifies the console and continues data processing automatically. The Operating system must be loaded on a separate disk for each server, not on the mirrored disks. www.twincom.com /netdisc.html   (778 words)

Setting up linux mirroring RAID's for booting The original disk is now not in use, and can be made to be the replacement for the 'failed disk'. The first annoying problem is that for some reason, the empty disk often has a different geometry than the disk the OS was installed on. The raidtab should be created such that the first disk in the mirror (/dev/hda) is marked as failed and the second disk (/dev/hdc) is just fine. www.isrl.uiuc.edu /systems/newmachine/linuxmirror.html   (1691 words)

[No title]   (Site not responding. Last check: 2007-10-21) This article is a step-by-step guide to regenerating a mirrored volume on a Windows 2000-based computer after you replace a failed hard disk. To be able to boot from the mirror disk, add the appropriate entry to your boot.ini file. The disk status may be displayed as "Offline," "Missing," or "Online (Errors)." To resolve this issue, repair any disk, controller, or connection problems and verify that the physical disk is turned on and correctly attached to the computer. www.jsifaq.com /SF/Tips/Tip.aspx?id=4564   (974 words)

INFO: Static Mirror (Disk) Image Backup   (Site not responding. Last check: 2007-10-21) A Static Mirror Disk Image backup is an Image backup that is done to another hard disk, rather than to a tape. The most important one is that in the case of a systems crash, instead of boot floppy disks needing to be used, the user may simply switch the boot SCSI ID to the mirrored drive, and they are up and running again with little or no down time. The first step in doing a Static Mirror Disk Image backup is to make certain that a second hard disk of equal or greater size to the original hard disk exists in the computer, and that it is free space (not partitioned, not formatted, and not assigned a drive letter) through Disk Administrator. www.ultrabac.com /kb5/htm/UBQ000109.htm   (353 words)

RAID 1 The advantages are that you can lose either disk and the data will still be accessible, and reads can be alternated between the two disks to improve performance. You are required to create the mirror on top of another type of SVM metadevice, known as a concat/stripe*. The SVM mirror code understands the layout of the concat/stripe submirrors and can therefore determine which resync regions reside on which underlying devices. www.softpanorama.org /Solaris/Disks_and_filesystems/SVM/mirroring.shtml   (2312 words)

ONLamp.com -- Using Software RAID-1 with FreeBSD   (Site not responding. Last check: 2007-10-21) If those two drives are attached to the same IDE cable, they are a mirror; if they are attached to separate cables, they are a duplex. You can complicate things by insisting on different disks with different sizes, but in the end you just end up with a harder configuration that wastes the extra disk space on the larger disk. This is a security feature that indicates that the disk is currently mounted for writing and therefore is unavailable. www.onlamp.com /pub/a/bsd/2005/11/10/FreeBSD_Basics.html   (995 words)

dannyman.toldme.com / FreeBSD HOWTO: Software Mirror System Disk Long and short of it I was unable to clean the disks on that first box and try again, i tried using dd but failed because at this point I was out of my depth. If it isn’t the boot drive that has failed (or the mirror is already running and you have hot-swap hardware) then it’s just a matter of ‘gmirror forgeting/removing’ the old disk and ‘gmirror inserting’ the new disk. Use ‘gmirror status’ to wait until the mirror rebuilds itself before exiting fixit (since it was the boot drive that failed). dannyman.toldme.com /2005/01/24/freebsd-howto-gmirror-system   (2881 words)

mirror disk - just once (replica) - LinuxQuestions.org Just in case disk damage i wish to have a replica of entire hda on another disk (hdb) If a disk dies you plug in the new disk and there are linux utilities (google search) availible to cause the mirror to rebuild. So i can put then replicated disk to machine with exactelly this same configuration and have backup system in case disaster. www.linuxquestions.org /questions/showthread.php?threadid=321584   (558 words)

Create a mirror on disk with valid data   (Site not responding. Last check: 2007-10-21) However, other sources like +> http://ezine.daemonnews.org/200502/diskmirror.html +> say that the mirror device should be first partitioned, labelled and +> formatted. From experimenting with +> different disks I have found out that (according to fdisk) the size of gm0 +> is several sectors smaller than that of ad0. The example is there actually to show that you can create a mirror with only one disk and add another one later. lists.freebsd.org /pipermail/freebsd-geom/2005-September/000798.html   (297 words)

Data Protection Solutions by Arco - Drive Backup, Hardware RAID 1 Disk Mirroring and Drive Copier / Drive Duplicator ...   (Site not responding. Last check: 2007-10-21) We provide easy to use low-cost hardware RAID 1 disk mirroring and drive backup products as well as hard drive copiers designed to duplicate IDE and SATA drives. This disk to disk, or drive to drive backup isn’t complicated and it has a number of very real advantages. The difference is that you set the EzBackup via software to automatically perform backups at certain times and it allows you to select and restore individual files if necessary. www.arcoide.com   (346 words)

FREE Disk Copy Tool. Hard Drive sector to sector Copy, Disk-to-Disk Backup, Clone and Image software EASEUS Disk Copy utility offers a very fast and easy way to copy all or part of a hard drive to another hard drive. EASEUS Disk Copy can be used for backup, cloning, or Upgrading your original small hard drive to a new larger drive. The combination of our three software as EASEUS Disk Copy, EASEUS Data Recovery Wizard and Partition Table Doctor is the perfect utility pouch for data recovery. www.easeus.com /disk-copy/index.htm   (334 words)

The UNIX Forums - sun mirror I have a solaris 9 machine which I would like to mirror it system disk using disk suite but my sun solaris machine has one internal disk which has the OS installed on. I have spare external disk of the same size, is it possible to mirror and internal disk with external disk using disk suite? i have only one internal disk which has the Os installed and metadb needs to the spread across as many disk as possible, at least two disk. www.unix.com /showthread.php?t=15528   (284 words)

Microsoft TechNet: The Mole 29: Technical Answers from Inside Microsoft - Disk Mirror, DHCP, Service Packs, Windows ... As far as Mole knows, a mirror never breaks, it's deliberately broken, either because one of the mirrored drives in the set fails, or because you decide you don't want to mirror your drives anymore—you'd rather have the disk space than the safety net, let's say. Broken mirrors, part deux, addresses the possibility you're actually looking to automate a fix after a drive has failed, in which case, Mole has bad news. If your solution means replacing a controller card or a disk, make it easy on yourself by using the exact same model you had before. www.microsoft.com /technet/archive/community/columns/inside/techan29.mspx   (2112 words)

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