[j-nsp] JUNOS: "UDMA ICRC error reading fsbn ..."

[Matt Yaklin]

On Tue, 5 Feb 2008, Paul Civati wrote:

> Samuel GAY <samuel.gay at c-s.fr> wrote:
>
>> We have a M7i with these errors at the end of the boot:
>>
>> ad0: 245MB <SanDisk SDCFJ-256> [980/16/32] at ata0-master PIO4
>> *ad1: UDMA ICRC error reading fsbn 78140097 of 0-3 (ad1 bn   78140097; cn 77519 tn 15 sn 0) retrying
>> ad1: UDMA ICRC error reading fsbn 78140097 of 0-3 (ad1 bn  78140097;  cn 77519 tn 15 sn 0) retrying
>> ad1: UDMA ICRC error reading fsbn 78140097 of 0-3 (ad1 bn  78140097;  cn 77519 tn 15 sn 0) retrying
>> ad1: UDMA ICRC error reading fsbn 78140097 of 0-3 (ad1 bn  78140097;  cn 77519 tn 15 sn 0) falling back to PIO mode
>> *ad1: 38154MB <HTE541040G9AT00> [77520/16/63] at ata0-slave PIO4
>>
>> Have you an idea of the meaning?
>> Is it an hardware problem? A clean install can solve the problem?
>
> fsbn = file system block number
>
> I would suggest there is a media problem with your disk (ad1) and
> you might want to look at replacing it.
>

I checked the juniper cluepon site as I was curious to remember how
to replace the hard disk myself.

I did it long ago on a m40 and i seem to remember creating the partitions
myself and dd'ing over the files from a working disk. As in having both
the new and old HD in a fbsd box and working from there. This assumes
a working hard disk from the router that has yet to fail but is old as
dirt.

But what if the old hard disk was toast? What would be the proper way
to get a working hard disk back into a juniper router by doing it 
yourself?

Could you create the partitions and MBR, install it back into the
router and then take a system snapshot?

I am trying to think it through as a mental exercise and I feel I
may be missing something.

Any tips from people who have recently done this would be greatly
apprecaited!

thank you,

matt

> -Paul-
>
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