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Q1. Which four activities are part of evaluating the tape application workloads supported by an SL8500?
A. dedicating rails to separate workloads
B. grouping tape drives by type function and quantity
C. managing cartridges for improved performance and archiving
D. minimizing elevator and pass-thru activities
E. mapping CAPS and pass-thru ports to partitions
Answer: A,B,D
Explanation: A:Dedicating rails—separating workloads to specific rails
Note:
Assign each workload its own tape drives, data tapes, scratch tapes, and free cells.
Dedicating separate resources to each workload and configuring these resources on as few LSMs as possible decreases pass thru activity, minimizes the time to mount tapes, and maximizes library throughput.
B: Grouping tape drives—locating them by function and drive type, with enough drives to support the workload
Note:Application-specific requirements may separate drive-types.
Example: placing T9840 access-centric tape drives on one rail, and T10000 capacity-centric tape drives on another.
C:Managing cartridges—moving inactive cartridges to archival LSMs or ejecting them. Maintaining free cells on each rail so cartridges can “float” there on a dismount.
D:Minimizing elevator and pass-thru port activity—enabling float and using CAPs intelligently.
Note:Do not try to distribute tape drives across all four rails is usually as this can increase pass- thru activity by the elevator and decrease overall performance of the library.
Reference; StorageTek SL8500 Modular Library System, Best Practises, Configuring Libraries to
Support Your Workloads
Q2. Which statement best describes the background audit process that the SL8500 library performs?
A. The library background audit updates the entire cartridge database during robotic operations ACSLS and HSC cartridge audit requests will be processed first, and then the library will satisfy the background audit.
B. The library will process all audits in the background or the library, never interfering with the mount or dismount requests. This audit will update the entire cartridge database during robotic operations.
C. A background audit updates the entire cartridge database in between robotic operations. If a particular cartridge has a request pending and that cartridge has not been audited, the SL8500 will audit the cartridge first and satisfy the request.
D. A background audit updates the entire cartridge database both during and in between robotic operations. ACSLS and HSC cartridge audit requests will be processed first, and then the library will satisfy the background audit.
Answer: C
Explanation: If an audit must be done after the failover, it is done in the background, while other jobs are processed. As a result, you may notice that library operations take slightly longer to perform until the audit is complete. In addition, if a particular request requires information about a location that has not yet been audited, the location will be audited first, causing a slight delay in processing the request.
Note: Entire library audit. The robot visits all cartridge slots (including the CAPs and drives), catalogs the VOLIDs and locations, and updates the HBC cartridge database. This audit is a background process and so does not interrupt online library operations. View the Cartridge Summary Report for the latest cartridge locations and VOLIDs.
Reference: StorageTek StreamLine SL8500, modular library system, User's Guide,Audit the Entire Library
Q3. If you have a current need for about 70 TB of backup, and have data growth expectations of about 10% per year, which library would you recommend?
A. SL24
B. SL48
C. SL500
D. SL3000
E. SL8500
Answer: C
Explanation:
C: SL500:
Capacity, Maximum Native (Uncompressed)
. LTO 5 (1.5 TB/cartridge) – 862 TB (575 cartridges)
. LTO 4 (800 GB/cartridge) – 460 TB (575 cartridges)
Reference: Datasheets
Q4. Using ACSLS, how would you delete a tape pool?
A. Set scr off and delete the pool
B. Remove all data tapes and delete the pool
C. Delete pool 0 and all empty pools will delete automatically
D. Remove all volumes from the pool and then delete it
Answer: A
Explanation: Use the delete pool command to delete empty scratch pools. If a pool contains scratch cartridges, you must reassign these cartridges to another pool before deleting the first pool. If a scratch cartridge is mounted, it becomes a data cartridge but remains in its scratch pool. Use the set scratch off command to reassign the data cartridge to the common pool.
Reference: StorageTek ACSLS, Automated Cartridge System Library Software , delete pool
Q5. Which four are recommendations for optimizing library performance for an SL8500?
A. Install redundant robotics.
B. Enter sufficient scratch cartridges to each rail.
C. Use ExLM with ACSLS.
D. Install tape drives that use the same media types on the same rails.
E. Use the float option.
Answer: A,B,D,E
Explanation: A: Redundant Robotics
A single SL8500 rail section can accommodate two robots, for a total of eight robots per library.
These robots can operate in parallel, significantly increasing the overall performance of the library.
B: When populating the rails:
Scratch cartridge pools: make sure the rails have enough scratch cartridges
D: When populating the rails:
Media types: make sure the rails have compatible cartridges for the tape drives
Note: Ways tape drives can enhance performance of the library are by:
.Placing tape drives in the outer tape drive columns to minimize dual robotic contention.
.Grouping tape drives by type on the same LSM.
.Keeping compatible media and drives on the same LSM.
.Allocating LSMs to support specific application workloads.
.Maintaining free cells on each LSM to support dismounts using the float option.
E: Cartridge Float Both ACSLS and HSC have cartridge float enabled by default. *Cartridge float is a feature that allows ACSLS or HSC to place a dismounted tape cartridge in an empty slot in the same LSM as or a closer LSM to the tape drive if the tape originally came from a different LSM using a pass-thru operation. *This feature minimizes elevator and pass-thru port activity by not requiring the cartridge to be returned to its original slot in another rail or library. Warning – Turning the default Float option OFF can have serious consequences for overall library performance. In both ACSLS and HSC, turning Float OFF can greatly increase the total robotics activity to unacceptable levels.
Q6. Which three statements about cap partitioning in the SL3000 are true?
A. CAPs can only be shared by partitions with the same host interface type (FC-SCSLor HLI).
B. Whole rotational or AEM CAPs can be allocated for exclusive use by one partition, or they can beshared by multiple partitions.
C. All CAPs in a partitioned library are unallocated by default. You use the SLC screens to allocate CAPs as dedicated or shared.
D. A portion of a CAP can be allocated to a partition.
Answer: B
Explanation: A rotational or AEM CAP is a shared library resource, meaning all partitions in the library can use the CAP. However, only one partition at a time can use a CAP. While a partition is using a CAP for enters or ejects, the CAP is reserved to that partition and unavailable to all others. For a partition to reserve a CAP, the CAP must meet all these conditions:
.Be available, meaning not reserved by any other partition
.Be empty
.Be closed and locked
Reference: StorageTek SL3000 Modular Library System, User’s Guide, Using CAPS in a Partitioned Library
Q7. How are logical libraries configured?
A. Only at the initial hardware install
B. Only through the Command Proc
C. Through the Command Proc and the ACSLS GUI
D. Only through the ACSLS GUI
Answer: D
Explanation:
Q8. What ACSLS command would change a cap priority?
A. set cap priority 5 0, 0, 1
B. define cap priority 5 0,0,1
C. change cap priority 5 0, 0, 1
D. lock cap priority 5 0, 0, 1
Answer: A
Explanation: A: The set cap priority command sets a CAP's automatic selection priority. Format set cap priority cap_priority cap_id
Reference: StorageTek ACSLS, Automated Cartridge System Library Software , set cap priority
Q9. When configuring drives in logical libraries which of the following is false?
A. To assign multiple drives to a logical library, the drives must be located in the same ACS.
B. Drives may be shared across multiple logical libraries.
C. Both LTO and Enterprise drives may be configured into logical libraries.
D. Drives may only be added to logical libraries through the ACSLS GUI.
Answer: A
Explanation:
Note:When partitioning the StorageTek SL8500, SL3000 or SL500 libraries into logical libraries, one can assign volumes and drives to the logical library to enable library consolidation, gain capacity on demand, and allow only the client connected to the logical library to access those volumes and drives.
Note: logical library
A virtual representation of a physical library. Synonymous with virtual library partition.
Q10. Which statement is NOT a recommendation for managing media on the SL8500?
A. Makesurethat each rail has the correct amount and type of cartridges plus enough scratch cartridges to support the workload.
B. Install redundant robotics to support maximum activity for each rail.
C. Migrate the least recently used cartridges away from the tape drives.
D. Cluster cartridges by workload on separate rails with enough drives to support the maximum activity for that workload.
Answer: B
Explanation:
Reference: StorageTek SL8500 Modular Library System, Best Practises, Configuring Tape Drives