Re: badblock handling

["Donghui Wen" <dhwen@protegonetworks.com>]

I read some posts before says 3ware's hardware raid is doing bad block
remapping, which is transparent to file system. I was wondering if md is
doing
the same way.

I am trying hardware raid 1+0 now, even it will lost half of the disk space,
but if it is stable and fast, I will go for it.

Donghui

----- Original Message ----- 
From: "Martin Dohmen" <md@tripnet.se>
To: "'Donghui Wen'" <dhwen@protegonetworks.com>;
<linux-raid@vger.kernel.org>
Sent: Wednesday, February 04, 2004 11:35 PM
Subject: Re: badblock handling


I have seen the same problem, but I have also noticed that if I use the
3ware cards own raid5 instead of md things work diffrently, the only thing
that seems to happen when a disk develops a bad block is this in the log:

3w-xxxx: scsi0: AEN: ERROR: Drive error: Port #6.
3w-xxxx: scsi0: AEN: WARNING: Sector repair occurred: Port #6.

I do not now if 3ware sets some block asside when the raid is created for
use when errors occure or if they justs writes the block agan and the disk
does the realocation by it self.

The downside of using 3ware raid5 is that performance is quite much lower
than with md, with 8 disks I get 90MB/s with md and 40MB/s with 3ware in
writespeed.


--On den 4 februari 2004 20:45 -0800 Donghui Wen
<dhwen@protegonetworks.com> wrote:

> Hi,
>      I am running a server with Linux software-raid (3ware controller).
> But from time to time,
> a disk is kicked out by md. This will happen when 3ware card reports a
> unrecovered read error
> for a sector. But when I run raidhotadd, the disk can added back to raid
> with no problem.
>      So my questions are:
>         (1) Will md  kick out one disk if it find out ONE bad block?
>         (2) Is it possible to set up a threshold, only the amount of bad
> blocks pass this threshold,
>             the disk will be kicked out.
>         (3) Is it possible to remap the bad blocks to some spare blocks
> automatically on the fly?
>
> Thanks!
>
> Donghui
>
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