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RE: how to find bad blocks

> Date: Wed, 10 Feb 2010 00:39:35 -0600
> From: stan@hardwarefreak.com
> To: debian-user@lists.debian.org
> Subject: Re: how to find bad blocks
> Vadkan Jozsef put forth on 2/9/2010 11:44 AM:
> > Besides the badblocks app?
> >
> > We have a samsung hdd, that keeps falling out of raid, but there are no
> > bad blocks on it, according to "badblocks" prog.
> This is probably because there are no bad blocks on it.
> > we would like to return it [warranty], but it would be better to find
> > e.g. bad blocks on it..:\ :D
> If "falling out of raid" means your hardware PCI/X/e/mobo mounted "real" RAID
> card is taking this drive "off line", usually this is because of a firmware
> issue. The firmware on the RAID card doesn't want to play with the firmware on
> the drive. This most often happens when a drive of dissimilar
> brand/make /model/size/fw_rev is added into an existing array of identical
> drives, or a group of identical drives is used but the controller doesn't like
> the drive firmware rev, period. In either case, "good" drives will be kicked
> off line by the controller. I went through a wacky case of this back in the
> late 1990s with Mylex DAC960 cards kicking Seagate ST118202LC drives off-line
> once a week (or more). Five DAC960s and 40 identical drives. Those DAC960s
> just didn't like that ST118202 firmware. These were U2W 80MB/s drives and the
> DAC960s were limited to UW or 40MB/s. Both Mylex and Seagate tech support said
> this was not the problem, that is was a firmware bug in the drives unrelated to
> bus speed. Took a while but we eventually got all the drives replaced. That is
> the most array rebuilding I've ever done, or probably ever will.
> To get RMA authorization in this situation usually only requir es telling the
> vendor what RAID controller you're using and what drive configuration. It
> always helps if you bought all components from the same vendor, and helps even
> more if you got a verbal or written commitment that the card and drives would
> work together in the configuration you had planned. If it's a low ball no name
> vendor that doesn't sell both RAID cards and drives, they may tell you to ____
> yourself, that the drive is fine. This is one huge disadvantage of using low
> end vendors and why corporations usually buy the bulk of their hardware from a
> single vendor.
> --
> Stan
> --
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Use 'fsck.ext3'


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