Question & Answer
Question
What can be checked when seeing poor tape performance
Answer
The following is a list of items to check for poor tape performance, however, this list should only be considered a starting point:
1) Verify the device drivers are up to date.
2) Check that the firmware is up to date.
3) Determine if the disk and tape share the same HBA/Port as this configuration is not recommended.
4) Determine if the number of tape drives and if their total throughput is greater than the HBA/port capacity. Example:
- Physical 3584 with 15 3592E06 drives
Each drive capable of 160MBytes/sec
HBA 4Gbit/sec is 500MB/sec
This would indicate 3 or possibly 4 drives could be used on the HBA Port
( 3x160MB=480MB or 4x160MB=640MB)
4 or 5 HBA ports would be needed for the 15 drives. HBA's may be either single or dual port.
Example on AIX:
- fcstat fcs0
FIBRE CHANNEL STATISTICS REPORT: fcs0
Device Type: 4Gb FC PCI Express Adapter (df1000fe)
(adapter/pciex/df1000fe)
Serial Number: 1A122002C6
Option ROM Version: 02E8277F
ZA: Z1F2.70A5
World Wide Node Name: 0x20000000C9BAD4DE
World Wide Port Name: 0x10000000C9BAD4DE
FC-4 TYPES:
Supported:
0x0000012000000000000000000000000000000000000000000000000000000000
Active:
0x0000010000000000000000000000000000000000000000000000000000000000
Class of Service: 3
Port Speed (supported): 4 GBIT
Port Speed (running): 2 GBIT <----- Here, this indicates the switch port is 2 Gbits
[{"Product":{"code":"SSGSG7","label":"Tivoli Storage Manager"},"Business Unit":{"code":"BU058","label":"IBM Infrastructure w\/TPS"},"Component":"--","Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"All Versions","Edition":"Edition Independent","Line of Business":{"code":"LOB26","label":"Storage"}}]
Product Synonym
TSM ADSM ITSM IBM Spectrum Protect
Was this topic helpful?
Document Information
Modified date:
17 June 2018
UID
swg21663043