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Dan Farrell wrote: |
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> On Sat, 1 Mar 2008 02:04:31 -0500 |
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> "Ritesh Kumar" <ritesh@××××××.edu> wrote: |
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> |
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> |
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>> On Fri, Feb 29, 2008 at 8:23 PM, maxim wexler <blissfix@×××××.com> |
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>> wrote: |
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>> |
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>> |
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>>>> Doesn't Ghost work with Ext3? What can I do to |
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>>>> recover my system without |
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>>>> reinstalling from scratch? |
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>>>> |
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>>>> |
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>>> I've had success with #dd if=<partition-to-be-copied> |
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>>> of=<partition-to-be-copied-to> bs=<varies> |
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>>> |
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>>> |
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>>> |
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>> Is there a reason why you backup the filesystem along with the data |
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>> on it? I do only minor backups... but even for anything major I would |
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>> use a tool like tar or rsync and drop the filesystem metadata |
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>> entirely. |
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>> |
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>> Also directly reading from the block device is hazardous unless you |
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>> umount (or mount as readonly) the filesystem in question. This is |
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>> because, the filesystem may not keep all the data synced to the disk |
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>> at all points in time. |
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>> |
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> |
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> not that i'd recommend it for production systems, but you could mount |
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> with the 'sync' option to help with this. |
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> |
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> |
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Even mounting sync is not safe, if you want to use dd for a backup then |
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boot from the live cd to backup everything. Otherwise using these |
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methods is risking a backup that once restored, does not work - not good |
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for the blood pressure... |
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|
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If you want to back the system up while it is running (in particular /), |
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then you need to use a tool that understands how to create a backup |
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image that is valid (i.e will boot) - something like xfsdump, dumpe2fs |
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etc or smart tar/dump based tools like Amanda. |
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|
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I would recommend using one of the dump tools for /boot, /, /usr, /var |
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*at least*. I've had the misfortune of helping many people restore their |
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broken Linux and Freebsd systems... and the only backups I've never had |
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issues with have been the *dump variety. They are a little unfriendly at |
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first, but they work. |
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regards |
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|
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Mark |
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-- |
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