Sun Storage 7000 Unified Storage System: Low throughput during NDMP tape cloning

Asset ID:	1-72-1363330.1
Update Date:	2018-01-05
Keywords:

Solution Type Problem Resolution Sure

Solution 1363330.1 : Sun Storage 7000 Unified Storage System: Low throughput during NDMP tape cloning

Applies to:

Sun Storage 7210 Unified Storage System - Version All Versions and later
Sun Storage 7110 Unified Storage System - Version All Versions and later
Sun ZFS Storage 7320 - Version All Versions and later
Sun ZFS Storage 7420 - Version All Versions and later
Sun ZFS Storage 7120 - Version All Versions and later
7000 Appliance OS (Fishworks)

Symptoms

Slow NDMP tape cloning in ZFS Unified Storage appliance.

NDMP tape cloning to a locally attached tape drives can only achieve around 6MB/sec

Normal NDMP backup can achieved much higher around 75MB/sec range.

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Cause

NDMP Tape Cloning Performance problems exist in pre 2011.x appliance NDMP code.

Performance improvements to use larger mover record size, removing timeout delay and adding multi-thread capability are being planned.

The NDMP Tape Cloning performance can be checked in a similar manner to the following.

In the following example, the Data Management Application is running Networker 7.6.1 with Ultrium-5 tape devices connected directly to ZFS Unified Storage appliance.

DMA can be any certified platform for ZFS Unified Storage appliance.

Networker nsrndmp_clone run in debug mode:

# nsrndmp_clone -vvvv -b'Monthly NDMP Clone' -S 2984830673
...
77398:nsrndmp_clone: NDMP Cloning started
...
67140:nsrndmp_clone: Open the source tape device : /dev/rmt/0n
69700:nsrndmp_clone: record size is set to 60 KB
67141:nsrndmp_clone: Open the destination tape device : /dev/rmt/1n
69700:nsrndmp_clone: record size is set to 60 KB
/rmt/0n (NDMP)(J) LTO Ultrium-5 E05144L5 2:reading, data
/rmt/1n (NDMP)(J) LTO Ultrium-5 E05181L5 1:writing at 5820 KB/s, 408 MB
** less than 6MB/sec **

On the Sun Unified Storage BUI, use analytics to confirm - Data Movement: NDMP bytes transferred to/from tape.

Alternatively, ndmpstat shows the number of read/write bytes transferred of about 5670 KBytes

aksh> confirm shell ndmpstat 2 5

wthr ops file disk tape bytes perf prcnt
r w bk rs rd wr rd wr rd wr rd wr bk rs dsk tpe idl
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 100
2 0 0 0 0 0 0 0 11340 11340 5670 5670 2 2 0 100 0
2 0 0 0 0 0 0 0 11340 11340 5670 5670 2 2 0 100 0
2 0 0 0 0 0 0 0 11340 11340 5670 5670 2 2 0 100 0
2 0 0 0 0 0 0 0 11400 11400 5700 5700 2 2 0 100 0

Solution

Upgrade to Appliance Firmware Release 2011.1.5.0 (or later) or 2013.1.0.1 (or later).

Related bugs :
CR 7048384 small mover record size
CR 7032986 NDMP three-way restore takes too long (include fix for 7033953)

Back to Document 1387930.1 Sun Storage 7000 Unified Storage System: How to Troubleshoot NDMP Issues.

References

<NOTE:1387930.1> - Sun Storage 7000 Unified Storage System: How to Troubleshoot NDMP Issues

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