From mboxrd@z Thu Jan  1 00:00:00 1970
From: Vijayan Prabhakaran <pvijayan@gmail.com>
Subject: Disk retries on error
Date: Wed, 2 Feb 2005 08:59:26 -0600
Message-ID: <d68fdf7d050202065917a56d45@mail.gmail.com>
Reply-To: Vijayan Prabhakaran <pvijayan@gmail.com>
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Hi,

I'm new to the Linux SCSI community. I got a few questions on how SCSI
drivers handle read/write failures.

When there is a latent sector fault (unable to read/write into a
sector), or if the data is corrupted (CRC failed), does the SCSI
drivers reissue the command ?

Does this differ from one SCSI driver (say, for IBM disk) to another
(say, for Seagate) ?

>>From my code browsing, I assume that retry happens in few cases. Some
of them are:

1. MEDIUM_ERROR 
What types of errors are classified as MEDIUM_ERROR ? Is this same as
data corruption ?

2. ABORTED_ERROR
Again, what types of errors are classified as this type ?

Any information regarding this will be greatly helpful.

Thanks,
Vijayan