[dtrace-discuss] One write is split into many physical IO (from result of fsrw.d )

[Qihua Wu]

Hi, All,

I have three questions about the output of fsrw.d
1: The write is to a shareplex queue(for oracle replication), but the write
is split into many many physical IO (I didn't paste all the disk_io here to
save space, but tons of such line contain "disk_io"). Does that means the
queue file is fragmented on disk? And it is also very strange as a writing
to a queue file resulted in disk_io on oracle file (the oracle file is QIO
file)

2: In the most right column, many lines are with value <none>, what's the
meaning of it?

3: In the second column for disk_io. The value is like vxio127003, vxdmp100
and sd59. I used prtdiag and prtconf but can't find their definition. Where
can I find them?

sc-read               .  R     3608      0
/oracle/ULOOKUP/splex/vardir53_9i/rim/q_uhs_mig_part5+P+o.ULOOKUP-o.ULOOKUP.q
  fop_read            .  R     3608      0
/oracle/ULOOKUP/splex/vardir53_9i/rim/q_uhs_mig_part5+P+o.ULOOKUP-o.ULOOKUP.q
sc-write              .  W     3608      0
/oracle/ULOOKUP/splex/vardir53_9i/rim/q_uhs_mig_part5+P+o.ULOOKUP-o.ULOOKUP.q
  fop_write           .  W     3608      0
/oracle/ULOOKUP/splex/vardir53_9i/rim/q_uhs_mig_part5+P+o.ULOOKUP-o.ULOOKUP.q
    disk_io  vxio127003  W     8192      0 <none>
    disk_io    vxdmp100  W     8192      0 <none>
    disk_io        sd59  W     8192      0 <none>
    disk_io  vxio127003  W     8192      0 <none>
    disk_io    vxdmp100  W     8192      0 <none>
    disk_io        sd59  W     8192      0 <none>
    disk_io  vxio127000  R   131072      0
/oracle/ULOOKUP/data01/.ULOOKUP_index01_21.dbf::cdev:vxfs:
    disk_io     vxdmp36  R    57344      0 <none>
    disk_io        sd63  R    57344      0 <none>
    disk_io     vxdmp44  R    65536      0 <none>
    disk_io        sd61  R    65536      0 <none>
    disk_io     vxdmp92  R     8192      0 <none>
    disk_io        sd67  R     8192      0 <none>
    disk_io  vxio127000  R   131072      0
/oracle/ULOOKUP/data01/.ULOOKUP_index01_21.dbf::cdev:vxfs:
    disk_io     vxdmp92  R    57344      0 <none>
    disk_io        sd67  R    57344      0 <none>
    disk_io     vxdmp68  R    65536      0 <none>
    disk_io        sd65  R    65536      0 <none>
    disk_io     vxdmp36  R     8192      0 <none>
    disk_io        sd63  R     8192      0 <none>
    disk_io  vxio127000  R   131072      0
/oracle/ULOOKUP/data01/.ULOOKUP_index01_21.dbf::cdev:vxfs:
    disk_io     vxdmp36  R    57344      0 <none>
    disk_io        sd63  R    57344      0 <none>
    disk_io     vxdmp44  R    65536      0 <none>
    disk_io        sd61  R    65536      0 <none>
    disk_io     vxdmp92  R     8192      0 <none>
    disk_io        sd67  R     8192      0 <none>
    disk_io  vxio127000  R   131072      0
/oracle/ULOOKUP/data01/.ULOOKUP_index01_21.dbf::cdev:vxfs:
    disk_io     vxdmp92  R    57344      0 <none>
    disk_io        sd67  R    57344      0 <none>
    disk_io     vxdmp68  R    65536      0 <none>
    disk_io        sd65  R    65536      0 <none>
    disk_io     vxdmp36  R     8192      0 <none>
    disk_io        sd63  R     8192      0 <none>
    disk_io  vxio127000  R   131072      0
/oracle/ULOOKUP/data01/.ULOOKUP_index01_21.dbf::cdev:vxfs:
    disk_io     vxdmp36  R    57344      0 <none>

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