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If you have the AIX iSCSI Software Initiator (iscsi0) configured on your system, you may find that nmon reports some “funny” information under the Disk Adapter (a) and Disk I/O (d) screens, such as:
┌─topas_nmon──4=Top-by-RAM-use───Host=aix1 Refresh=2 secs───15:09.41──────────────────────────┐
│ Disk-Adapter-I/O ─────────────────────────────────────────────────────────────────────────────────────│
│Name %busy read write xfers Disks Adapter-Type │
│vscsi1 0.0 0.0 0.0 KB/s 0.0 4 Virtual SCSI Client A │
│vscsi0 0.0 0.0 0.0 KB/s 0.0 4 Virtual SCSI Client A │
│Adapter name "not available" returned by AIX API │
│vscsi3 0.0 0.0 0.0 KB/s 0.0 12 Virtual SCSI Client A │
│vscsi2 0.0 0.0 0.0 KB/s 0.0 12 Virtual SCSI Client A │
│TOTALS 5 adapters 0.0 0.0 KB/s 0.0 32 TOTAL(MB/s)=0.0 │
│ Disk-KBytes/second-(K=1024,M=1024*1024) ──────────────────────────────────────────────────────────────│
│Disk Size Free Disk Disk Volume Disk │
│ Name GB GB Paths Adapter Group Description │
│hdisk11 29 0 1 vscsi1 localscratchvg Virtual SCSI Disk Drive │
│hdisk1 50 20 1 vscsi1 rootvg Virtual SCSI Disk Drive │
│hdisk9 25 0 1 vscsi1 localscratchvg Virtual SCSI Disk Drive │
│hdisk3 50 34 1 vscsi1 datavg Virtual SCSI Disk Drive │
│hdisk2 50 34 1 vscsi0 datavg Virtual SCSI Disk Drive │
│hdisk8 25 0 1 vscsi0 localscratchvg Virtual SCSI Disk Drive │
│hdisk10 29 0 1 vscsi0 localscratchvg Virtual SCSI Disk Drive │
│hdisk0 50 20 1 vscsi0 rootvg Virtual SCSI Disk Drive │
│hdisk6 0 0 1 not available None MPIO NetApp iSCSI Disk │
│hdisk16 0 0 1 not available None MPIO NetApp iSCSI Disk │
│hdisk17 0 0 1 not available None MPIO NetApp iSCSI Disk │
│hdisk12 0 0 1 not available None MPIO NetApp iSCSI Disk │
│hdisk7 0 0 1 not available None MPIO NetApp iSCSI Disk │
│hdisk13 0 0 1 not available None MPIO NetApp iSCSI Disk │
│hdisk14 0 0 1 not available None MPIO NetApp iSCSI Disk │
│hdisk15 0 0 1 not available None MPIO NetApp iSCSI Disk │
│hdisk4 50 0 1 not available projvg MPIO NetApp iSCSI Disk │
│hdisk5 750 0 1 not available ipscratchvg MPIO NetApp iSCSI Disk │
│hdisk18 104 54 2 vscsi2 projectsvg Virtual SCSI Disk Drive │
│hdisk19 104 0 2 vscsi2 scratchvg Virtual SCSI Disk Drive │
│hdisk20 104 0 2 vscsi2 scratchvg Virtual SCSI Disk Drive │
│hdisk21 104 0 2 vscsi2 scratchvg Virtual SCSI Disk Drive │
│hdisk22 104 0 2 vscsi2 scratchvg Virtual SCSI Disk Drive │
│hdisk23 104 0 2 vscsi2 scratchvg Virtual SCSI Disk Drive │
│hdisk24 104 0 2 vscsi2 scratchvg Virtual SCSI Disk Drive │
│hdisk25 104 0 2 vscsi2 scratchvg Virtual SCSI Disk Drive │
│hdisk26 104 0 2 vscsi2 scratchvg Virtual SCSI Disk Drive │
│hdisk27 104 0 2 vscsi2 scratchvg Virtual SCSI Disk Drive │
│hdisk28 104 0 2 vscsi2 scratchvg Virtual SCSI Disk Drive │
│hdisk29 104 0 2 vscsi2 scratchvg Virtual SCSI Disk Drive │
│Totals(MB/s) Read=0.0 Write=0.0 Size(GB)=2354 Free(GB)=161 │
│───────────────────────────────────────────────────────────────────────────────────────────────────────│
I don’t know if there are any plans to fix this but I wanted to share this information in case anyone else encounters this issue. iSCSI is not all that popular on AIX systems (perhaps this is a good thing?), so it may not impact enough people to warrant a quick fix.
