I have a strange performance issue that I am trying to work out
involving network attached storage being used for TSM stgpool volumes.
The TSM server is AIX 5.3, and the network is a dedicated Gbit. We
started out using iSCSI for the storage pool volumes creating 10 X
250GB volumes and placing a single logical volume per 250GB physical
volume, and letting TSM do the load balancing. We are a small shop,
and the 30-40 MB/s performance that we were seeing in backups was
acceptable. That is until we had to audit some volumes.
For the audit, we are seeing abysmal performance. Approximately 3-5
MB/s per volume. Adding volumes increases the total throughput, but
the performance per volume remains around 3-5 MB/s.
From the command line we can get 30-60 MB/s using dd to and from an
iSCSI volume. So we did some testing on NFS.
Using NFS, we are able to get 60-80 MB/s from the AIX OS using dd both
read and write. So we decided to create volumes on the NFS mount.
The "define vol" command ran for 10+ hours on a 100 GB volume at 2 MB/s.
Thinking it was just the def vol that was a problem, I ran a move data
to the new volume, and it ran at 3-5 MB/s. I then ran an audit on the
volume, and again I am only getting 3-5 MB/s.
This seems like a tuning issue inside TSM, but I could not tell you
what parameter would cause such a slow down. I have done my homework
on this, and have not found any relevant posts. If anyone has some
suggestions, I would love to hear them.
As a side note, defining a volume on the local root drive runs at
16-20 MB/s.
tsm: TSM>q option
Server Option Option Setting Server Option
Option Setting
----------------- -------------------- -----------------
--------------------
CommTimeOut 60 IdleTimeOut 15
BufPoolSize 32768 LogPoolSize 512
MessageFormat 1 Language
AMENG
Alias Halt HALT MaxSessions 25
ExpInterval 24 ExpQuiet No
EventServer Yes ReportRetrieve No
DISPLAYLFINFO No MirrorRead DB
Normal
MirrorRead LOG Normal MirrorWrite DB
Sequential
MirrorWrite LOG Parallel TxnGroupMax 256
MoveBatchSize 1000 MoveSizeThresh
2048
RestoreInterval 1,440 DisableScheds No
NOBUFPREfetch No AuditStorage Yes
REQSYSauthoutfile Yes SELFTUNEBUFpools- No
ize
DBPAGEShadow No DBPAGESHADOWFile
dbpgshdw.bdt
MsgStackTrace On QueryAuth
None
LogWarnFullPerCe- 90 ThroughPutDataTh- 0
nt reshold
ThroughPutTimeTh- 0 NOPREEMPT
( No )
reshold
Resource Timeout 60 TEC UTF8 Events No
AdminOnClientPort Yes NORETRIEVEDATE No
IMPORTMERGEUsed Yes DNSLOOKUP Yes
NDMPControlPort 10,000 NDMPPortRange 0,0
SHREDding Automatic SanRefreshTime 0
TCPPort 1500 TcpAdminport
1500
HTTPPort 1580 TCPWindowsize
64512
TCPBufsize 32768 TCPNoDelay Yes
CommMethod TCPIP MsgInterval 1
ShmPort 1510 FileExit
UserExit FileTextExit
AssistVCRRecovery Yes AcsAccessId
AcsTimeoutX 1 AcsLockDrive No
AcsQuickInit Yes SNMPSubagentPort
1521
SNMPSubagentHost 127.0.0.1 SNMPHeartBeatInt 5
TECHost TECPort 0
UNIQUETECevents No UNIQUETDPTECeven- No
ts
Async I/O No SHAREDLIBIDLE No
3494Shared No CheckTrailerOnFr- On
ee
SANdiscovery On SSLTCPPort
SSLTCPADMINPort SANDISCOVERYTIME- 15
Server Name:
Server host name or IP address:
Server TCP/IP port number: 1500
Crossdefine: On
Server Password Set: Yes
Server Installation Date/Time: 11/11/08 15:01:10
Server Restart Date/Time: 12/28/09 11:50:39
Authentication: On
Password Expiration Period: 9,999 Day(s)
Invalid Sign-on Attempt Limit: 0
Minimum Password Length: 0
Registration: Closed
Subfile Backup: No
Availability: Enabled
Accounting: Off
Activity Log Retention: 5 Day(s)
Activity Log Number of Records: 9243
Activity Log Size: 1 M
Activity Summary Retention Period: 30 Day(s)
License Audit Period: 1 Day(s)
Last License Audit: 12/28/09 23:50:44
Server License Compliance: Valid
Central Scheduler: Active
Maximum Sessions: 25
Maximum Scheduled Sessions: 12
Event Record Retention Period: 30 Day(s)
Client Action Duration: 5 Day(s)
Schedule Randomization Percentage: 25
Query Schedule Period: Client
Maximum Command Retries: Client
Retry Period: Client
Scheduling Modes: Any
Log Mode: Normal
Database Backup Trigger: Disabled
BufPoolSize: 32,768 K
Active Receivers: CONSOLE ACTLOG
Configuration manager?: Off
Refresh interval: 60
Last refresh date/time:
Context Messaging: Off
Table of Contents (TOC) Load Retention: 120 Minute(s)
Machine Globally Unique ID:
00.00.00.00.b0.33.11.dd.b0.f9.08.63.01.02.03.02
Archive Retention Protection: Off
Encryption Strength: AES
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