Re: support for tape library sun sl24 or sun sl48

[Chris Hoogendyk]

I use a lot of Sun equipment, but I haven't splurged on Sun tape drives 
(they haven't come up on the education deals for one thing). However, as 
you say, the tape drive itself is a standard lto4 from HP. The old 
internal DAT drives on some of my Sun servers are also standard HP.


You could use one of the tapetypes from the wiki, but I would be 
inclined (as Paul suggested) to run amtapetype. It will take a long 
time, but it will spit out a configuration specific to your server, and 
you will see how your server handles the tape drive. And, actually, it 
would take less time than this thread has been running. ;-)


Then compare your configuration to the published specifications for the 
drive (see, e.g. 
http://en.wikipedia.org/wiki/Linear_Tape-Open#Generations). 
Theoretically, you should get somewhere up around 120MB/s. If you end up 
with a speed down around 31MB/s as the one configuration someone posted 
on the wiki, then you probably need to evaluate your backup server, 
because it's not keeping up with the tape, and the tape is probably 
shoe-shining.



---

Chris Hoogendyk

-
  O__   Systems Administrator
 c/ /'_ --- Biology & Geology Departments
(*) \(*) -- 140 Morrill Science Center
~~ - University of Massachusetts, Amherst 




--- 


Erdös 4




Uwe Bartels wrote:

Hi,

does any has experiences with amanda  and sun(storagetek) sl24 or 
better sl48 with 2 lto4 tape drives?

the tape drives are normal lto4 tape drive from HP.

Or can I simply take the configuration from the "Arcvault 48 - HP 
LTO4-800 tape"?


best regards,
Uwe



2009/5/18 Paul Bijnens >


On 2009-05-18 16:28, Uwe Bartels wrote:

Hi,

does anybody know if the tape library sun(storagetek) sl24 or
sun(storagetek) sl48 with 2 lto4 tape drives are working?

If so. how are the general parameters, which i'm missing in
the "Tape Type List
 ".


http://wiki.zmanda.com/index.php/Tapetype_definitions#LTO4

Dell PowerVault LTO4-120 - LTO4-800 tape

define tapetype LTO4 {
  comment "Dell LTO4 800Gb - Compression Off"
  length 802816 mbytes
  filemark 0 kbytes
  speed 52616 kps
}

Arcvault 48 - HP LTO4-800 tape

define tapetype HPLTO4 {
  comment "HP LTO4 800gb - Compression Off"
  length 772096 mbytes
  filemark 0 kbytes
  speed 31368 kps
}

Re: support for tape library sun sl24 or sun sl48

[Uwe Bartels]

Hi,

does any has experiences with amanda  and sun(storagetek) sl24 or better
sl48 with 2 lto4 tape drives?
the tape drives are normal lto4 tape drive from HP.

Or can I simply take the configuration from the "Arcvault 48 - HP LTO4-800
tape"?

best regards,
Uwe



2009/5/18 Paul Bijnens 

> On 2009-05-18 16:28, Uwe Bartels wrote:
>
>> Hi,
>>
>> does anybody know if the tape library sun(storagetek) sl24 or
>> sun(storagetek) sl48 with 2 lto4 tape drives are working?
>>
>> If so. how are the general parameters, which i'm missing in the "Tape Type
>> List  ".
>>
>
> http://wiki.zmanda.com/index.php/Tapetype_definitions#LTO4
>
> Dell PowerVault LTO4-120 - LTO4-800 tape
>
> define tapetype LTO4 {
>   comment "Dell LTO4 800Gb - Compression Off"
>   length 802816 mbytes
>   filemark 0 kbytes
>   speed 52616 kps
> }
>
> Arcvault 48 - HP LTO4-800 tape
>
> define tapetype HPLTO4 {
>   comment "HP LTO4 800gb - Compression Off"
>   length 772096 mbytes
>   filemark 0 kbytes
>   speed 31368 kps
> }
>
>
>

Re: support for tape library sun sl24 or sun sl48

[Uwe Bartels]

2009/5/18 Paul Bijnens 

> On 2009-05-18 16:28, Uwe Bartels wrote:
>
>> Hi,
>>
>> does anybody know if the tape library sun(storagetek) sl24 or
>> sun(storagetek) sl48 with 2 lto4 tape drives are working?
>>
>> If so. how are the general parameters, which i'm missing in the "Tape Type
>> List  ".
>>
>
> http://wiki.zmanda.com/index.php/Tapetype_definitions#LTO4
>
> Dell PowerVault LTO4-120 - LTO4-800 tape
>
> define tapetype LTO4 {
>   comment "Dell LTO4 800Gb - Compression Off"
>   length 802816 mbytes
>   filemark 0 kbytes
>   speed 52616 kps
> }
>
> Arcvault 48 - HP LTO4-800 tape
>
> define tapetype HPLTO4 {
>   comment "HP LTO4 800gb - Compression Off"
>   length 772096 mbytes
>   filemark 0 kbytes
>   speed 31368 kps
> }


yes. i read this. but thanks.


>
>
>
> But I believe both of these entries have a speed that is indicating
> the host cannot keep up with the speed of the tapedrives.
>
> I believe the speed for LTO4 should be near 120Mbyte/second. And probably
> (can't find the source where I learned about it) the tapedrive
> can slow down to about 50% to the minimum streaming speed.
> Below the minimum streaming speed the drive needs to stop/restart
> and while doing that, it looses capacity, as you can see from the
> length numbers above.  (And besides capacity loss, the wear/tear
> on the tape and tapedrive becomes significant as well!)
>
> So I would insert a tape in your drive, and run amtapetape on your
> own configuration, to verify if your host is capable to drive the tape
> at full speed.  Also take into consideration that amtapetype does
> not even read the data from disk.  To be able to read the data at
> at least 60Mbyte/sec from disk, you'll need a holdingdisk with a
> striped raid setup.


we are planning to use a machine with 48 sata disks in a configuration of
20 + 20 disk in rain 10 + 8 hot spares. this should give enough speed for
the drive.

Cheers,
Uwe

Re: support for tape library sun sl24 or sun sl48

[Paul Bijnens]

On 2009-05-18 16:28, Uwe Bartels wrote:

Hi,

does anybody know if the tape library sun(storagetek) sl24 or 
sun(storagetek) sl48 with 2 lto4 tape drives are working?


If so. how are the general parameters, which i'm missing in the "Tape 
Type List  ".


http://wiki.zmanda.com/index.php/Tapetype_definitions#LTO4

Dell PowerVault LTO4-120 - LTO4-800 tape

define tapetype LTO4 {
   comment "Dell LTO4 800Gb - Compression Off"
   length 802816 mbytes
   filemark 0 kbytes
   speed 52616 kps
}

Arcvault 48 - HP LTO4-800 tape

define tapetype HPLTO4 {
   comment "HP LTO4 800gb - Compression Off"
   length 772096 mbytes
   filemark 0 kbytes
   speed 31368 kps
}


But I believe both of these entries have a speed that is indicating
the host cannot keep up with the speed of the tapedrives.

I believe the speed for LTO4 should be near 120Mbyte/second. And probably
(can't find the source where I learned about it) the tapedrive
can slow down to about 50% to the minimum streaming speed.
Below the minimum streaming speed the drive needs to stop/restart
and while doing that, it looses capacity, as you can see from the
length numbers above.  (And besides capacity loss, the wear/tear
on the tape and tapedrive becomes significant as well!)

So I would insert a tape in your drive, and run amtapetape on your
own configuration, to verify if your host is capable to drive the tape
at full speed.  Also take into consideration that amtapetype does
not even read the data from disk.  To be able to read the data at
at least 60Mbyte/sec from disk, you'll need a holdingdisk with a
striped raid setup.

--
Paul Bijnens, Xplanation Technology ServicesTel  +32 16 397.525
Interleuvenlaan 86, B-3001 Leuven, BELGIUM  Fax  +32 16 397.552
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support for tape library sun sl24 or sun sl48

[Uwe Bartels]

Hi,

does anybody know if the tape library sun(storagetek) sl24 or
sun(storagetek) sl48 with 2 lto4 tape drives are working?

If so. how are the general parameters, which i'm missing in the "Tape Type
List  ".

thanks.
Uwe