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scst: Follow up for r6804

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git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@6817 d57e44dd-8a1f-0410-8b47-8ef2f437770f
This commit is contained in:
Vladislav Bolkhovitin
2016-02-24 01:47:02 +00:00
parent dd3f46fd28
commit ca246c4a50
3 changed files with 17 additions and 15 deletions
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14
scst/README
View File

@@ -1647,14 +1647,14 @@ perform actual path state switching on SET TARGET PORT GROUPS command,
for instance, by calling drbdadm. For more information see stpgd README
as well as sample script scst_on_stpg.
DRBD compatibility
..................
DRBD and other replication/failover SW compatibility
....................................................
DRBD does not allow to open its device on the secondary as well as does
not allow to perform primary to secondary transition, if this device is
open.
DRBD as well as other replication/failover SW does not allow to open its
device on the secondary as well as does not allow to perform primary to
secondary transition, if this device is open.
SCST BLOCKIO handler has all the necessary support for this behavior. If
SCST BLOCKIO handler has all the necessary support for such behavior. If
you write new ALUA state in the "state" attribute, SCST BLOCKIO handler
before transition closes the open devices' handles and after transition
reopens them, if the new state is active or nonoptimized.
@@ -1668,7 +1668,7 @@ above). Wait until the blocking finished.
2. Change the ALUA state to "transitioning". At this moment all open
file handles will be closed.
3. Perform the DRBD state transition
3. Perform the DRBD or other replication/failover SW state transition
4. Change the ALUA state to your desired secondary state.

14
scst/README_in-tree
View File

@@ -1500,14 +1500,14 @@ perform actual path state switching on SET TARGET PORT GROUPS command,
for instance, by calling drbdadm. For more information see stpgd README
as well as sample script scst_on_stpg.
DRBD compatibility
..................
DRBD and other replication/failover SW compatibility
....................................................
DRBD does not allow to open its device on the secondary as well as does
not allow to perform primary to secondary transition, if this device is
open.
DRBD as well as other replication/failover SW does not allow to open its
device on the secondary as well as does not allow to perform primary to
secondary transition, if this device is open.
SCST BLOCKIO handler has all the necessary support for this behavior. If
SCST BLOCKIO handler has all the necessary support for such behavior. If
you write new ALUA state in the "state" attribute, SCST BLOCKIO handler
before transition closes the open devices' handles and after transition
reopens them, if the new state is active or nonoptimized.
@@ -1521,7 +1521,7 @@ above). Wait until the blocking finished.
2. Change the ALUA state to "transitioning". At this moment all open
file handles will be closed.
3. Perform the DRBD state transition
3. Perform the DRBD or other replication/failover SW state transition
4. Change the ALUA state to your desired secondary state.

4
scst/src/dev_handlers/scst_vdisk.c
View File

@@ -3617,7 +3617,9 @@ static int blockio_exec(struct scst_cmd *cmd)
/*
* We should not get here, unless the user space
* misconfiguring something, e.g. set optimized
* ALUA state for secondary DRBD device.
* ALUA state for secondary DRBD device. See
* "DRBD and other replication/failover SW
* compatibility" section in SCST README.
*/
PRINT_WARNING("Closed FD on exec. Secondary DRBD or not "
"blocked dev before ALUA state change? "