CentOS - Oct 2011 - [HW] Do the HDD cages in rack mount chassis indicate visual/audio HDD failure?

I have no personal experience with rack mount chassis.
>From the past postings, I reckon there are  members, in this list, who
have experience in rack mount setups and would like get their advice.

To reduce the H/W cost, I am considering Linux mdadm RAID10 on a 2U chassis.

I would appreciate clarification on the following:

In rack mount chassis, do the cages that house the
hard disks have the following feature?

(a) Indicate disk failure. LED lights up and/or audio alarm?
(b) The failed HDD can be swapped.

TIA.
-- 
Arun Khan

On 10/11/11 12:11 AM, Arun Khan wrote:
> In rack mount chassis, do the cages that house the
> hard disks have the following feature?
>
> (a) Indicate disk failure. LED lights up and/or audio alarm?
that requires specific configuration to suit whatever drive interconnect 
you have.

> (b) The failed HDD can be swapped.
If they are in hotswap bays, yes.  if they aren't, no.

they have 2U servers with as many as 25 2.5" SAS bays now.


-- 
john r pierce                            N 37, W 122
santa cruz ca                         mid-left coast

Dear Arun,

On Tuesday, October 11, 2011 you wrote:

> I would appreciate clarification on the following:
> (a) Indicate disk failure. LED lights up and/or audio alarm?
> (b) The failed HDD can be swapped.
Don't rely on the LED going on. I mark all my hot swap disks with
labels with their serial number. This label is visible from the
outside without removing the HD.
That way, I can double check that I remove the faulty disk.
Pulling the wrong disk is the last thing you want to risk in a RAID
setup. Relying on a fault LED is close to that.
Also make a list of the HD serial numbers and their position within
the RAID in time. Store that in a safe place.

I pulled ONCE the wrong disk out of a Raid5 array. :-(
You know what that means?

best regards
---
Michael Schumacher
PAMAS Partikelmess- und Analysesysteme GmbH
Dieselstr.10, D-71277 Rutesheim
Tel +49-7152-99630
Fax +49-7152-996333
Gesch?ftsf?hrer: Gerhard Schreck
Handelsregister B Stuttgart HRB 252024

On Tuesday, October 18, 2011 01:07:02 PM Les Mikesell
wrote:
> I don't think anything is immune to failure.  Another fun case is a
> randomly-bad memory bit causing different things to be written to
> software raid mirrors.  I had one that took 3+ days of running
> memtest86 to catch.
ECC RAM?