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Follow up for the previous commit
git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@5480 d57e44dd-8a1f-0410-8b47-8ef2f437770f
This commit is contained in:
Vladislav Bolkhovitin
25
scst/README
25
scst/README
@@ -945,13 +945,15 @@ cache. The following parameters possible for vdisk_fileio:
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will go from the initiator. This option overrides "write_through"
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option. Disabled by default.
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- tst - sets TST field of SCSI Control mode page. See SPC-4 for more
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details about this field as well as about possible values.
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- thin_provisioned - enables thin provisioning facility, when remote
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initiators can unmap blocks of storage, if they don't need them
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anymore. Backend storage also must support this facility.
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- tst - allows to specify TST control mode page field. It specifies
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the type of task set in the device. Possible values are: 0 - the
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device maintains one task set for all I_T nexuses and 1 - the device
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maintains separate task sets for each I_T nexus. Default - 1.
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- removable - with this flag set the device is reported to remote
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initiators as removable.
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@@ -968,16 +970,17 @@ storage HBAs and for applications that either do not need caching
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between application and disk or need the large block throughput. See
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below for more info.
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The following parameters possible for vdisk_blockio: filename,
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blocksize, nv_cache, read_only, removable, rotational, thin_provisioned,
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tst. See vdisk_fileio above for description of those parameters.
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The following common with vdisk_fileio parameters are possible for
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vdisk_blockio: filename, blocksize, nv_cache, write_through, read_only,
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removable, rotational, thin_provisioned, tst. See vdisk_fileio above for
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description of those parameters.
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Handler vdisk_nullio provides NULLIO mode to create virtual devices. In
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this mode no real I/O is done, but success returned to initiators.
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Intended to be used for performance measurements at the same way as
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"*_perf" handlers. The following parameters possible for vdisk_nullio:
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blocksize, read_only, removable. See vdisk_fileio above for description
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of those parameters.
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blocksize, read_only, removable, tst. See vdisk_fileio above for
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description of those parameters.
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vdisk_nullio also has extra attribute:
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@@ -989,7 +992,7 @@ vdisk_nullio also has extra attribute:
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"dummy" placeholder on LUN 0, if LUN 0 is not desired.
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Handler vcdrom allows emulation of a virtual CDROM device using an ISO
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file as backend. It doesn't have any parameters.
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file as backend. It has only single parameter: tst.
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For example:
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@@ -1107,11 +1110,11 @@ above description of those parameters.
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Each vdisk_nullio's device has the following attributes in
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/sys/kernel/scst_tgt/devices/device_name: blocksize, read_only,
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removable, size_mb, t10_dev_id, threads_num, threads_pool_type, type,
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usn, dummy. See above description of those parameters.
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tst, usn, dummy. See above description of those parameters.
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Each vcdrom's device has the following attributes in
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/sys/kernel/scst_tgt/devices/device_name: filename, size_mb,
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t10_dev_id, threads_num, threads_pool_type, type, usn. See above
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t10_dev_id, threads_num, threads_pool_type, type, usn, tst. See above
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description of those parameters. Exception is filename attribute. For
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vcdrom it is writable. Writing to it allows to virtually insert or
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change virtual CD media in the virtual CDROM device. For example:
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@@ -803,13 +803,15 @@ cache. The following parameters possible for vdisk_fileio:
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will go from the initiator. This option overrides "write_through"
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option. Disabled by default.
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- tst - sets TST field of SCSI Control mode page. See SPC-4 for more
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details about this field as well as about possible values.
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- thin_provisioned - enables thin provisioning facility, when remote
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initiators can unmap blocks of storage, if they don't need them
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anymore. Backend storage also must support this facility.
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- tst - allows to specify TST control mode page field. It specifies
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the type of task set in the device. Possible values are: 0 - the
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device maintains one task set for all I_T nexuses and 1 - the device
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maintains separate task sets for each I_T nexus. Default - 1.
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- removable - with this flag set the device is reported to remote
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initiators as removable.
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@@ -826,16 +828,17 @@ storage HBAs and for applications that either do not need caching
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between application and disk or need the large block throughput. See
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below for more info.
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The following parameters possible for vdisk_blockio: filename,
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blocksize, nv_cache, read_only, removable, rotational, thin_provisioned,
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tst. See vdisk_fileio above for description of those parameters.
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The following common with vdisk_fileio parameters are possible for
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vdisk_blockio: filename, blocksize, nv_cache, write_through, read_only,
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removable, rotational, thin_provisioned, tst. See vdisk_fileio above for
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description of those parameters.
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Handler vdisk_nullio provides NULLIO mode to create virtual devices. In
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this mode no real I/O is done, but success returned to initiators.
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Intended to be used for performance measurements at the same way as
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"*_perf" handlers. The following parameters possible for vdisk_nullio:
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blocksize, read_only, removable. See vdisk_fileio above for description
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of those parameters.
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blocksize, read_only, removable, tst. See vdisk_fileio above for
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description of those parameters.
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vdisk_nullio also has extra attribute:
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@@ -847,7 +850,7 @@ vdisk_nullio also has extra attribute:
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"dummy" placeholder on LUN 0, if LUN 0 is not desired.
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Handler vcdrom allows emulation of a virtual CDROM device using an ISO
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file as backend. It doesn't have any parameters.
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file as backend. It has only single parameter: tst.
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For example:
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@@ -959,11 +962,11 @@ above description of those parameters.
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Each vdisk_nullio's device has the following attributes in
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/sys/kernel/scst_tgt/devices/device_name: blocksize, read_only,
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removable, size_mb, t10_dev_id, threads_num, threads_pool_type, type,
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usn, dummy. See above description of those parameters.
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tst, usn, dummy. See above description of those parameters.
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Each vcdrom's device has the following attributes in
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/sys/kernel/scst_tgt/devices/device_name: filename, size_mb,
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t10_dev_id, threads_num, threads_pool_type, type, usn. See above
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t10_dev_id, threads_num, threads_pool_type, type, usn, tst. See above
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description of those parameters. Exception is filename attribute. For
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vcdrom it is writable. Writing to it allows to virtually insert or
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change virtual CD media in the virtual CDROM device. For example:
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