2(two) NSR e1200-160 in MSL 6030 LTO3

[Goran Kubelka]

Dear all,

If we put 2(two) NSR e1200-160 in MSL 6030 with two tape drives, can we dedicate first NSR to first tape Drive and second NSR to second tape drive to achieve NSPoF regarding SAN conectivity.
Regards

[Kurt Beyers. · Accepted solution]

Goran,

You should indeed connect only one LTO3 drive to each NSR router. One router cannot keep two LTO3 drives streaming, they are rather fast.

The robotarm however stays connected to only one NSR router, so this remains a SPOF.

best regards,
Kurt

[Sยภเl Kย๓คг]

Hi,

Very well u can have this setup. All that you need to do is to dedicate one NSR for one drive, then create the maps. There won't be much performance diffrence as there won't be much data flow because of only two drive setup. How ever u can have a redundancy in ur library. If one NSR or path fails, the other drive will be operational.

Regards,
Sunil

[vsnap]

Good Evening!

We have connected two LTO Ultrium 3 (960) Drives to one NSR 1200-160. Is the NSR 1200 160 powerfull enough to keep these drives Streaming when Backing up on both devices at the same time (different Machines with Media Agents)?

Bernd

[Arend Lensen]

Bernd,

Most of the time the problem is the host and not the NSR.
Native speed for LTO-3 is 80MB/sec but thats without compression. If the data can be compressed 2:1 then you must supply twice the amount of data to the drive to keep it running on maximum speed.
The minimim speed for the drives is 27MB/s, again without compression, with 2:1 compression, you need to supply at least 54MB/s.

Kind regards,
Arend

[vsnap]

Currently I get about 50MB when writing to one Drive. When writing to two drives I get about 30MB on each device. Currently I'm not shure where to search the Bootleneck. Either it is our EVA the NSR or the Fabric (everything is connected wiht 2GB).

Bernd

[Arend Lensen]

Bernd,

Install LT&T and do the System performance test and the Device performance test, it will show you exactly where the problem is, most of time its the host (filesystem).

Kind regards,
Arend

[Tom O'Toole]

This old thread never had a satisfactory answer. It looks like you can put two embedded NSRs in a 6000MSL library according to this (doc seems to indicate otherwise).

This guys question about whether an NSR e1200-160 could keep two LTO3s running did not get answered. Anybody know?


I guess I will probably try putting two e1200-160s which we have lying around in an MSL6000 w/ two LTO4s and see if that's faster than a single e1200-320. The number to beat is 215MB/s for two drives.

comments?

[Tom O'Toole]

Oh actually it did get answered, it was stated it would not be able to keep 2 LTO3s going, missed that...