That would be every couple of days in a few shops. Where did you read that?
My understanding was what the previous folks said, that it was an on-demand
thing.
Curtis Preston | VP Data Protection
GlassHouse Technologies, Inc.
T: +1 760 710 2004 | C: +1 760 419 5838 | F: +1 760 710 2009
cpreston AT glasshouse DOT com | www.glasshouse.com
Infrastructure :: Optimized
-----Original Message-----
From: veritas-bu-bounces AT mailman.eng.auburn DOT edu
[mailto:veritas-bu-bounces AT mailman.eng.auburn DOT edu] On Behalf Of smpt
Sent: Saturday, October 25, 2008 9:12 AM
To: 'Justin Piszcz'; 'A Darren Dunham'
Cc: Veritas-bu AT mailman.eng.auburn DOT edu
Subject: Re: [Veritas-bu] Poll: How many times do you use a cleaning tape?
IBM LTO3 and LTO4 requires cleaning every 16 TB of data.
stefanos
-----Original Message-----
From: veritas-bu-bounces AT mailman.eng.auburn DOT edu
[mailto:veritas-bu-bounces AT mailman.eng.auburn DOT edu] On Behalf Of Justin
Piszcz
Sent: Tuesday, October 14, 2008 1:10 AM
To: A Darren Dunham
Cc: Veritas-bu AT mailman.eng.auburn DOT edu
Subject: Re: [Veritas-bu] Poll: How many times do you use a cleaning tape?
On Mon, 13 Oct 2008, A Darren Dunham wrote:
> On Mon, Oct 13, 2008 at 04:54:22PM -0400, Justin Piszcz wrote:
>> Also I've read / heard its best to let LTO-3 LTO-4 drives set the tape
>> alert flag when they need cleaning vs. cleaning drives at intervals
>> (which is recommended for sure with LTO-2) -- what have you observed?
>
> I'm not sure which you're saying is recommended for LTO-2. As far as
> I'm aware, periodic cleaning is not recommended for any model of LTO
> drive. This is documented for HP and IBM drives:
>
> HP
> Should I do regular cleaning like DDS?
>
> The HP Ultrium drive is designed to require very minimal
> cleaning. The internal head cleaner provides an effective
> preventative cleaning against head contamination. Regular cleaning
> using cleaning cartridge is not necessary. Do not use a cleaning
> cartridge unless the drive requests it and the Use Cleaning
> Cartridge
>
> IBM
> The IBM Ultrium LTO Tape Drive was intentionally designed to be
> self-monitoring and self-cleaning. Therefore, the IBM recommendation
> is not to manually clean the tape drive, but rather to use the
> automatic cleaning function provided with the library or by your
> application.
>
> Each drive determines when it needs to be cleaned and alerts the
> library or your application.
>
> In order to prevent recontamination of drive surfaces, you are
> limited to using a specific cleaner cartridge a maximum of 50 times.
>
> Note: Do not manually initiate drive cleaning unless requested by
> support engineers. LTO drives are self-cleaning and will require
> infrequent cleaning using cleaning cartridges.
>
> I found the document I was thinking of. HP LTO-1 uses 18.5 meters of
> cleaning tape, other models use 5.5 meters. So you get 15 on an LTO1
> and 50+ on LTO-2 and LTO-3 (and I assume on LTO-4 as well).
>
> I love whoever proofread this sentence. (...up to at least..)
>
> IMPORTANT: A cleaning cartridge can be used up to at least 50 times
> (LTO2 and LTO3) or 15 times (LTO1). The cleaning cartridge is ejected
> immediately if it has expired or if it is not an approved Ultrium
> cleaning cartridge. Discard it and use a new one.
>
> Technically, because the cleaning usage algorithm isn't mandated,
> there's no way for a universal cleaning *tape* manufacturer to know what
> the usage will be beforehand. A manufacturer could use more or less.
> However, it appears that both IBM and HP use 50 on recent drives.
>
> --
> Darren
Very nice information/description, thanks!
Justin.
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