Sun StorageTek SL8500 Modular Library System
 
Sun StorageTek T10000 Tape Drive
 

PLA-Support>Sun Systems>TAPE>Tape Hardware>SN-TP: SL3000-8500 Library
 

In this Document

Goal

Solution

Oracle Confidential PARTNER - Available to partners (SUN).
Reason: Confidential to Service Personnel Only

Applies to:

Goal

 SL8500/T10000D - Maximum Number of Drives That Can Fit in an SL8500 for T10000D.

Solution

With maxed out configuration, the SL8500 can populate 53 T10000D drives.

Engineering is investigating the phase balancing to see if more tape drives can be installed.  A phase balancing change involves an embed of the PDU and/or cable changes.  Any potential improvement with phase balancing will take some time to determine.

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Follow on to above statement:

That only covers a library that has one type drive (T10kD) in it. What is the trade-off for a mixed library. For instance, having SL8500s with 9840s and T10k A, B and C drives in them.  Can we substitute only one T10kD drive for one of any of the others or is there a formula we can use?  This could be an issue for the field as well.

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A formula to determine the possible mix of drives was not derived - it would be too complicated. The attached calculator has drop down lists for the other drive types and other configurable system components. There is also an area for the rack power, which can be entered in Watts. The technique is not elegant as it is "trial and error", but the tradeoffs for a mixed library involve entering in the number of system components and then seeing if the AC line current is below the service rating (26.4A for 30A service and 44A for 50A service). If the current exceeds the service rating, then the number of T10K D drives or other system components has to be reduced.

As an example, if the customer wanted to install the maximum number of T10K D drives with the balance consisting of T10K A B or C drives, then they would by trial and error select the drives and see when the AC power is okay. I did that for the attached condition and it turns out to be 10 T10K D drives and 54 T10K A B or C drives.  If the rack power is reduced or other system components are reduced, then the mix will change. The solution is also dependent on which AC source is used, Wye or Delta.

Note: FYI, This is a Sales tool, not intended for direct customer use.  With the complex configurations and increasing drive and hardware support engineering will have to explore how simplify this.  

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