On 7 February 2011 16:21, Robert G. (Doc) Savage <[email protected]>wrote:
> On Mon, 2011-02-07 at 21:37 +0530, vishesh kumar wrote: > > Dear all > > I suspect one of my hard disk have corruption. I want to perform > > surface scan to get idea of corrupted hard disk sectors. What command > > will be most appropriate for this purpose on RHEL 5. > > Does 'badblocks' is right command to use in this scenario ? > > Vinesh, > > >From 'man badblocks': > > Important note: If the output of badblocks is going to be fed to the > e2fsck or mke2fs programs, it is important that the block size is > properly specified, since the block numbers which are generated are > very dependent on the block size in use by the filesystem. For this > reason, it is strongly recommended that users not run badblocks > directly, but rather use the -c option of the e2fsck and mke2fs > programs. > > Hope this helps... > > That's also somewhat dated now. You can often recover bad blocks simply by writing to them and letting the disk allocate replacements -- badblocks -n can be useful for this. You should also look at smartctl -- it'll tell you whether or not it thinks the disk is healthy. Usually when a disk is throwing errors I bin it on the grounds that once it's started to have problems it's only going to get worse. Disks are not generally cheaper than the data they store :-) jch
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