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LTO6 - Poor Performance On Tape Drive (Doc ID 2621774.1)

Last updated on DECEMBER 20, 2019

Applies to:

StorageTek SL150 Modular Tape Library - Version All Versions and later
IBM LTO6 Tape Drive - Version All Versions and later
Information in this document applies to any platform.

4 LTO6 tape drives installed in an SL150 tape library. 3 of 4 tape drives have very poor performance. Tested multiple backups to the drives in question along with the 1 drive that has good performance. Tested the same backup, from the same Netbackup client, using the same master server and have found the performance on the 3 drives are much worse than the one drive. Changed media servers and had the same results. Changed clients and have the same results. Froze media to force the use of scratch tapes and had the same results. Checked the switch logs and found no errors. Believe the issue is with the tape drives. The drives in question are in slots 2, 3, and 4. The drive in slot 1 is performing very well. The bridged drive is in slot 2.

Symptoms

Drives shows a high write retry count.
Drives stated originally there were a lot of write retries with all 4 of the last tapes used in the drive.

log_error

2019-09-06T15:35:08.838, 1640.0.0, 535, robot, /usr/local/bin/Ifm, error, 0000, 1234, "Director - directorVerdeCapResp() directorVerdeCapRequ: CAP sensor not Opened after Open Operation; End of Text"
2019-09-20T15:03:19.470, 1640.0.0, 535, robot, /usr/local/bin/Ifm, error, 0000, 1234, "Director - directorVerdeCapResp() directorVerdeCapRequ: CAP sensor not Opened after Open Operation; End of Text"
2019-10-09T17:51:41.060, 0.0.0, 3200, ifm, , error, 3000, 3318, "(request id = HOST/0x94aff60) IfmMove::commonMoveCommand(): LOAD DRIVE: (P:MR) 0:1,Top Drive with tape NL0149L6 request failed:"
2019-10-10T10:09:43.314, 0.0.0, 3200, ifm, , error, 3000, 3315, "(request id = UNKNOWN/0) IfmMove::prepareForMove():DRIVE UNLOAD of (P:MR) 0:2,Top Drive with tape NL0030L6 failed"
2019-10-10T15:08:25.320, 0.0.0, 3200, ifm, , error, 3000, 3315, "(request id = UNKNOWN/0) IfmMove::prepareForMove():DRIVE UNLOAD of (P:MR) 0:2,Bottom Drive with tape NL0181L6 failed"
2019-10-11T15:25:21.209, 1640.0.0, 535, robot, /usr/local/bin/Ifm, error, 0000, 1234, "Director - directorVerdeCapResp() directorVerdeCapRequ: CAP sensor not Opened after Open Operation; End of Text"

log_warning
2019-10-10T09:43:48.275, 0.0.0, 000, tti-dbg, , warn, 0000, 0000, "ADT: receive: Called but nothing to read!! Drive: 2"
2019-10-10T09:43:48.276, 0.0.0, 000, tti-dbg, , warn, 0000, 0000, "ADT: sendPkt: not logged in, try to establish a new link"
2019-10-10T09:43:54.215, 0.0.0, 000, tti-dbg, , warn, 0000, 0000, "ADT: sendPkt: Drive: 2 - Was logged out, had to renegotiate the link!"
2019-10-10T09:44:04.310, 0.0.0, 000, tti-dbg, , warn, 0000, 0000, "ADT: receive: Called but nothing to read!! Drive: 2"
2019-10-10T09:44:04.310, 0.0.0, 000, tti-dbg, , warn, 0000, 0000, "ADT: sendPkt: not logged in, try to establish a new link"
2019-10-10T09:44:10.255, 0.0.0, 000, tti-dbg, , warn, 0000, 0000, "ADT: sendPkt: Drive: 2 - Was logged out, had to renegotiate the link!"
2019-10-10T10:09:28.351, 0.0.0, 000, tti-dbg, , warn, 0000, 0000, "ADT: receive: Called but nothing to read!! Drive: 3"
2019-10-10T10:09:28.352, 0.0.0, 000, tti-dbg, , warn, 0000, 0000, "ADT: sendPkt: not logged in, try to establish a new link"
2019-10-10T10:09:33.281, 0.0.0, 000, tti-dbg, , warn, 0000, 0000, "ADT: sendPkt: Drive: 3 - Was logged out, had to renegotiate the link!"
2019-10-10T10:09:43.310, 0.0.0, 000, tti-dbg, , warn, 0000, 0000, "ADT: receive: Called but nothing to read!! Drive: 3"
2019-10-10T10:09:44.391, 0.0.0, 000, tti-dbg, , warn, 0000, 0000, "ADT: sendPkt: not logged in, try to establish a new link"
2019-10-10T10:09:50.331, 0.0.0, 000, tti-dbg, , warn, 0000, 0000, "ADT: sendPkt: Drive: 3 - Was logged out, had to renegotiate the link!"
2019-10-10T15:08:09.350, 0.0.0, 000, tti-dbg, , warn, 0000, 0000, "ADT: receive: Called but nothing to read!! Drive: 4"
2019-10-10T15:08:09.351, 0.0.0, 000, tti-dbg, , warn, 0000, 0000, "ADT: sendPkt: not logged in, try to establish a new link"
2019-10-10T15:08:15.292, 0.0.0, 000, tti-dbg, , warn, 0000, 0000, "ADT: sendPkt: Drive: 4 - Was logged out, had to renegotiate the link!"
2019-10-10T15:08:25.318, 0.0.0, 000, tti-dbg, , warn, 0000, 0000, "ADT: receive: Called but nothing to read!! Drive: 4"
2019-10-10T15:08:26.405, 0.0.0, 000, tti-dbg, , warn, 0000, 0000, "ADT: sendPkt: not logged in, try to establish a new link"
2019-10-10T15:08:31.335, 0.0.0, 000, tti-dbg, , warn, 0000, 0000, "ADT: sendPkt: Drive: 4 - Was logged out, had to renegotiate the link!"
2019-10-10T17:10:46.289, 0.0.0, 000, tti-dbg, , warn, 0000, 0000, "ADT: receive: Called but nothing to read!! Drive: 4"
2019-10-10T17:10:46.290, 0.0.0, 000, tti-dbg, , warn, 0000, 0000, "ADT: sendPkt: not logged in, try to establish a new link"
2019-10-10T17:10:52.212, 0.0.0, 000, tti-dbg, , warn, 0000, 0000, "ADT: sendPkt: Drive: 4 - Was logged out, had to renegotiate the link!"
2019-10-10T17:11:02.309, 0.0.0, 000, tti-dbg, , warn, 0000, 0000, "ADT: receive: Called but nothing to read!! Drive: 4"
2019-10-10T17:11:02.310, 0.0.0, 000, tti-dbg, , warn, 0000, 0000, "ADT: sendPkt: not logged in, try to establish a new link"
2019-10-10T17:11:08.232, 0.0.0, 000, tti-dbg, , warn, 0000, 0000, "ADT: sendPkt: Drive: 4 - Was logged out, had to renegotiate the link!"
2019-10-11T15:25:21.210, 0.0.0, 3200, ifm, , warn, 3018, 1234, "ifmOpenCap - Director failed, Robot OK but CAP did not Open"
2019-10-12T09:50:23.872, 0.0.0, 000, tti-dbg, , warn, 0000, 0000, "ADT: receive: Called but nothing to read!! Drive: 4"
2019-10-12T09:50:23.873, 0.0.0, 000, tti-dbg, , warn, 0000, 0000, "ADT: sendPkt: not logged in, try to establish a new link"
2019-10-12T09:50:29.795, 0.0.0, 000, tti-dbg, , warn, 0000, 0000, "ADT: sendPkt: Drive: 4 - Was logged out, had to renegotiate the link!"
2019-10-12T09:50:39.892, 0.0.0, 000, tti-dbg, , warn, 0000, 0000, "ADT: receive: Called but nothing to read!! Drive: 4"
2019-10-12T09:50:39.892, 0.0.0, 000, tti-dbg, , warn, 0000, 0000, "ADT: sendPkt: not logged in, try to establish a new link"
2019-10-12T09:50:44.798, 0.0.0, 000, tti-dbg, , warn, 0000, 0000, "ADT: sendPkt: Drive: 4 - Was logged out, had to renegotiate the link!"

The drive 2,3,4 encountered a renegotiate link issue, while drive 1 has been not.

Cause

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In this Document
Symptoms
Cause
Solution
References


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