???????????? How does this work? I have not seen
anything about this or seen it implemented anywhere in
NetWorker 6.x. Does it actually work??? I know it will
be implemented in NetWorker 7, but 6.x? Could you
please let me know how to implement this?
// Matts
--- Salvatore Buccoliero <sb AT EXELLO DOT DK> skrev: > One
thing i want to add to the cleaning discussion.
>
> If NetWorker is installed on a W2k server, NetWorker
> can actually handle
> the cleaning signal from the device. In that case
> you get the best of
> two worlds: Cleaning when needed, and NetWorker
> knows it is happening
> and the cleaning does not disturb the running
> backups/restores.
>
> Salvatore Buccoliero
> ____________________________________
> Tlf: 70 211 480
> Fax: 70 211 481
> Mobil: 2428 5505
> Mail: sb AT exello DOT dk
> http: www.exello.dk
> ____________________________________
>
>
>
> -----Oprindelig meddelelse-----
> Fra: Davina Treiber [mailto:treiber AT HOTPOP DOT COM]
> Sendt: 27. februar 2003 12:07
> Til: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
> Emne: [Networker] Drive cleaning
>
>
> I'd like to revisit the age old discussion about the
> best way to do
> drive cleaning. I'm working at a site with a large
> number of tape
> libraries of various sizes, mainly from StorageTek,
> but also some older
> ADIC units. The drives are DLT7000 gradually
> migrating to LTO. They
> currently use NetWorker cleaning on most of these
> and we are trying to
> establish the best strategy. Here is my attempt to
> be objective about
> the pros and cons of the two possible approaches, as
> well as my own
> opinion. I would be very interested to hear what the
> NetWorker community
> think about this emotive issue. Some views from
> Legato staff would also
> be welcome.
>
> NetWorker controlled cleaning.
> NetWorker is configured to clean drives at set
> intervals of elapsed
> time. The cleaning tape(s) is/are stored in a
> designated tape slot
> within the range normally used for data tapes. The
> number of cleaning
> tape uses is configured within NetWorker. When a
> cleaning tape is used
> up, a notification can be sent from NetWorker.
>
> Library firmware controlled cleaning.
> The library firmware is configured to clean drives
> on demand. The DLT or
> LTO drives are sophisticated enough to send a signal
> to the library when
> cleaning is needed, and the library automatically
> loads and unloads the
> cleaning tape at exactly this time. The cleaning
> tape(s) is/are stored
> in dedicated cleaning slots (library dependent). The
> number of cleaning
> tape uses is configured in the library firmware.
> When a cleaning tape is
> used up, most libraries withdraw the tape to the CAP
> and display a
> message on the library front panel, this may be
> accessible remotely if
> the library has remote management software and a
> network connection.
>
> What is wrong with NetWorker controlled cleaning?
> * The cleaning is based on an elapsed time since the
> last clean, e.g.
> two weeks. This takes no account of the drive usage
> in this time, a
> heavily used storage node drive may have had perhaps
> 168 hours of use in
> that time, whereas a drive attached to an
> application server may have
> only had perhaps 14 hours use. It is highly likely
> that the former case
> would have required a clean before that time, but
> unlikely that the
> latter case is anywhere near to needing a clean.
>
> * Cleaning a drive before it is required is wasteful
> of cleaning tapes
> and can be bad for the drive. DLT drives need
> infrequent cleaning, LTO
> drives rarely need cleaning at all.
>
> * A heavily used drive may require cleaning before
> the cleaning interval
> is reached. It will not get cleaned on demand, and
> may cause errors or
> damage to data tapes. You can clean manually if
> there are errors but
> this is not ideal on a remote site because unless
> you can actually see
> the library you don't know whether the error was
> caused by the need to
> clean or some other problem.
>
> * One or more data slots are lost due to the need to
> store cleaning
> tapes.
>
> * Because cleaning tapes are in data slots, you must
> take care to
> specify a slot range to avoid the cleaning tapes
> when inventorying the
> jukebox.
>
> What is wrong with library controlled cleaning?
> * NetWorker may show an error on loading a tape when
> the library is
> cleaning a drive. Usually these errors are
> recoverable without user
> intervention.
>
> * Cleaning tape usage data is only available from
> the library front
> panel. Some libraries have remote monitoring
> software available, but
> this requires a network connection which may not
> have been set up. Even
> with remote monitoring software, it requires
> pro-activity, to go and
> check usage rather than being automatically alerted.
>
> * When a drive goes bad, it may repeatedly request
> cleaning and use up a
> cleaning tape. NetWorker cleaning would just show
> errors. Which is
> worse?
>
> * Not all libraries support this feature.
>
> Legato Support always recommended using library
> firmware cleaning where
> available in pre 6.x days. Now it seems that they
> are recommending
> NetWorker cleaning instead. I don't understand the
> reason for this
> U-turn, since all the disadvantages listed above
> still apply. I firmly
> believe that library firmware cleaning is superior
> to NetWorker
> cleaning.
>
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