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General description
CHARON-AXP supports emulation of DEC-KGPSA-CA PCI Fibre Channel adapter.
Every instance of KGPSA-CA works in one of the two following modes:
- Fabric virtualization mode (creating virtual fabric in combination with virtual FC-3 Storage Controller). This is default mode.
- Pass Through mode (using a specific CHARON PCI Pass Through driver)
- Fabric presentation mode (using Linux FC HBA directly)
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Loading KGPSA storage adapter
Syntax for loading KGPSA-CA storage adapter:
load KGPSA <name> |
Example:
load KGPSA FGA |
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In AlphaStation 400 configuration use the following syntax for KGPSA-CA storage adapter loading:
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The adapter instance name ("FGA" in the example above) is used then for parametrization, for example:
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Configuration parameters
The KGPSA-CA PCI FC adapter emulation has the following configuration parameters:
host_bus_location
| Parameter | host_bus_location |
|---|---|
| Type | Text String |
| Value |
Establish connection between virtual DEC-KGPSA-CA PCI FC adapter and physical EMULEX LightPulse PCI/PCI-X/PCIe FC adapter (695402720Pass Through mode) Syntax:
Example:
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wwid
| Parameter | wwid[N] N is 0..32766 (no more than 255 units) |
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| Type | Text String |
| Value | Sets WWID for emulated KGPSA adapter unit. Syntax:
Example:
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container
| Parameter | container[N] N is 0..32766 (no more than 255 units) | ||
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| Type | Text String | ||
| Value | Possible values of the parameter are strings in one of the following forms:
This parameter is initially not set, thus creating NO storage elements on the controller. |
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media_type
| Parameter | media_type[N] N is 0..32766 (no more than 255 units) |
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| Type | Text String |
| Value | Instructs CHARON-AXP to use the supplied value as the PRODUCT field in the FC INQUIRY data returned to a software running on virtual HP Alpha system in response to FC INQUIRY command. If not specified, CHARON-AXP attempts to guess the FC INQUIRY data based on virtual FC device type and underlying container (which is specified in the corresponding container configuration parameter). Initially is not specified. Example:
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removable
| Parameter | removable[N] N is 0..32766 (no more than 255 units) |
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| Type | Boolean |
| Value | When set to "true", the removable configuration parameter instructs CHARON-AXP to report the corresponding virtual FC device as removable. By default the removable configuration parameter is set to "false". Example:
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geometry
| Parameter | geometry[N] N is 0..32766 (no more than 255 units) | ||||
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| Type | Text String | ||||
| Value | This formatted string value specifies the explicit geometry of the disk storage element. The string format is <X>”/”<Y>[“/”<Z>] or <X>”,”<Y>[“,”<Z>][“,”<B>] where: Parameter | Description | X | The
If this parameter is not set, CHARON-AXP will configure the geometry based on the most probable disk type. Initially not set. Example:
Info |
possible to specify each parameter independently of another one. The following syntax is used for that: |
use_io_file_buffering
| Parameter | use_io_file_buffering[N] N is 0..32766 (no more than 255 units) |
|---|---|
| Type | Boolean |
| Value | When set to "true", instructs CHARON-AXP to enable host operating system I/O cache on read/write operations.
When enabled, host operating system I/O cache may significantly improve I/O performance of the virtual system. At the same time maintaining I/O cache requires additional host resources (CPU and memory) which may negatively affect overall performance of the virtual system. Initially is set to "false". Example:
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io_queue_depth
| Parameter | io_queue_depth[N] N is 0..32766 (no more than 255 units) |
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| Type | Numeric |
| Value | Specifies KGPSA I/O requests (read or write) for a given unit in a range 2..128 Setting this parameter enables KGPSA instance to run up-to the specified numbers of I/O requests (read or write) for unit N in parallel, thus improving the performance. The default value set by controller is optimal for most of the cases. It may be needed to enlarge this number if guest OS I/O queue for a certain unit contains too much pending entries. In this case the value should be equal to an average size of the queue, collected statistically. Please do not set this parameter without clear understanding of the purpose. By default parallel execution of I/O requests is disabled. Example:
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min_n_of_threads
| Parameter | min_n_of_threads |
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| Type | Numeric |
| Value | Instructs KGPSA I/O to reserve a given number of working threads in a range 1..64, thus improving the performance. All units of KGPSA instance share the I/O threads. The default value is equal to number of units plus 2. For optimization it is possible to set this parameter to sum of the "io_queue_depth" parameters for each unit plus 2. This assumption seems optimal for most of the cases. Please do not set this parameter without clear understanding the purpose. Example:
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In this mode KGPSA-CA PCI FC adapter can be directly mapped to physical disks (both local and iSCSI) and disk images as shown in the following example:
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See the "695402720Configuration parameters" section for details.
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The following is a list of EMULEX LightPulse PCI/PCI-X/PCIe FC adapters supported by CHARON-AXP PCI Pass Through driver and suitable for emulation of KGPSA-CA PCI FC adapter in CHARON PCI Pass Through mode:
Supported | Not Supported | Not tested |
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LP8000 | LPe1150 (FC2142SR, A8002A) | LPe11000 |
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To build PPT driver for EMULEX LightPulse PCI/PCI-X/PCIe FC do the following:
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| 1 | Make sure that the required building tools and include files are installed. If they are absent install them: # yum
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| 2 | Open xterm and change the default directory to "
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| 3 | Issue "make clean; make" commands to build kernel object: # make
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| 4 | Check that there are no compilation errors and the file "ppt_kgpsa.ko" has been built |
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To install PPT driver for EMULEX LightPulse PCI/PCI-X/PCIe FC do the following:
| Step | Description |
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| 1 | Unload standard "lpfc" driver; to do that issue the following command: # rmmod
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| 2 | Load "
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| 3 | Issue "dmesg" command and check that no error appeared during the driver loading, also check that the driver has found all KGPSA devices. # dmesg
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To add PPT driver for EMULEX LightPulse PCI/PCI-X/PCIe FC to Linux startup do the following:
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| 1 | Disable auto-loading of Linux standard "lpfc" driver on boot. To do that add "blacklist lpfc" to the black list file "/etc/modprobe.d/blacklist.conf" | |||||
| 2 | Copy the KGPSA-CA kernel module to the location of Linux kernel modules, for example:
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| 3 | Enable auto load of the module: # echo
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| 4 | Regenerate new "initramfs" image with "mkinitrd": # mkinitrd
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It provides the following functionality:
| Command | Description | ||
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| Scans connected SAN using FC adapters, discovers FC ports, storage controllers, logical units and then builds volatile FC database. The "/verbose" qualifier enables FC communication trace on console (for diagnostic and troubleshooting). | ||
| Displays corresponding part of volatile FC database. | ||
| Fills the environment variables wwid0..wwid3 and n1..n4 to identify path(s) to logical unit with the specified UDID. These variables are later used by "INIT" to create device database entries and by OpenVMS/Tru64 to get access to boot and dump disks. This command does NOT make any change to other environment variables. | ||
fc set {boot | dump} wwid <X> | Fills the environment variables wwid0..wwid3 and n1..n4 to identify path(s) to logical unit with the specified WWID. These variables are later used by "INIT" to create device database entries and by OpenVMS/Tru64 to get access to boot and dump disks. This command does NOT make any change to other environment variables. This parameter is useful if UDID is absent.
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| Clears environment variables wwid0..wwid3 and n1..n4, which automatically disable (but do NOT delete) device database entries representing FC attached devices. This command does NOT affect volatile FC database. |
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The next step is to configure paths for the FC storage:
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The CHARON-AXP FC Fabric presentation mode allows to use Linux FC HBA directly. When using this mode, there is no need to load KGPSA adapter(s) as it was described before. The following syntax has to be used instead:
Example:
load kgpsa_generic_storage PGA interface="host3" |
Below please find step-by-step explanation on how to configure "kgpsa_generic_storage" instance.
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First we need to find Linux FC HBA for mapping.
List available adapters
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So, 2 HBAs, 3 ports are available.
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Load HBA's kernel modules (drivers)
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Discover the Linux SCSI hosts the FC HBAs are mapped to
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So, the available ports are mapped to hosts 3, 4 and 6.
Discover the connected FC HBAs (ports)
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So the connected hosts are 3 and 6 ("MSA CONTROLLER").
Discover the HBAs port/node names
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So the names are:
| Host | Mapping | Port name |
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| 3 | Lancer-X, port 0 ("3:0:0:0") | 0x10000090faa00a31 |
| 4 | Lancer-X, port 1 ("3:0:0:1") | 0x10000090faa00a32 |
| 6 | LP8000 single port | 0x10000000c923ea51 |
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Charon Configuration
2 ways of specification in Charon configuration file are available:
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Specify Linux port name "0x10000090faa00a31" in Charon configuration file:
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The configuration given with port name is independent on hardware change, modules load order, etc | ||
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By host id name
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The configuration given with host id name might change on hardware change, modules load order, etc |
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Name of FC, SCSI host or adapter's port/node name, defining a connection to Linux FC HBA, for example:
| Mapping | Description |
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fc_host6 | Emulation over Linux SG (FC) host 6 |
host6 | Emulation over Linux SG (FC) host 6 |
2000-0000-C923-EA51 | Emulation over Linux SG (FC) host given with port/node name |
0x20000000C923EA51 | Emulation over Linux SG (FC) host given with port/node name |
wwn-0x20000000C923EA51 | Emulation over Linux SG (FC) host given with port/node name |
Example:
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trace_level
| Value | Description |
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0 | none (default) |
1 | All failures and suspects |
| 2 | SCSI, ELS/CT request flow |
3 | MB/IOCB request flow |
Example:
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io_model
I/O model is used for request processing.
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This parameter is needed for debugging puproses only, so it is strongly recommended not to specify any value without particular instructions from Stromasys. |
| Value | Description |
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sync | synchronous |
async | asynchronous (default) |
Example:
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port_name
The port name in format: %04x-%04x-%04x-%04x. Option to fake guest's port name.
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This parameter is needed for debugging puproses only, so it is strongly recommended not to specify any value without particular instructions from Stromasys. |
Example:
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By default this value is obtained from the specified hardware port (see above).
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node_name
The node name in format: %04x-%04x-%04x-%04x. Option to fake guest's node name.
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This parameter is needed for debugging puproses only, so it is strongly recommended not to specify any value without particular instructions from Stromasys. |
Example:
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By default this value is obtained from the specified hardware port (see above).
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When FC wire is removed and then plugged in, Linux rebuilds all the FC objects with new devices names, etc. Fabric presentation mode senses the link up and down events, but optionally it may delay reporting the event (for the given amount of seconds) to let Linux fully initialize FC. If delay is 0, guest OS may start initialization too early and thus fail to find some or all objects.
Example:
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link_poll_period
The link check poill interval in seconds Default is 1 second.
When FC wire is removed and then plugged in, Linux rebuilds all the FC objects with new devices names, etc. Fabric presentation mode senses the link up and down events, but optionally it may delay reporting the event (for the given amount of seconds) to let Linux fully initialize FC. If delay is 0, guest OS may start initialization too early and thus fail to find some or all objects.
Example:
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emu_fabric
The way the emulation deals with fabric:
| Value | Description |
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auto | Delegates to Linux if supported, otherwise emulates |
no | Delegates to Linux (real physical fabric port connected too) |
| yes | Emulates |
Qlogic does not map SG devices for ELS/CT traffic. To work around this, Fabric presentation mode implements emulation of the whole non FCP (scsi) communication over fabric. If fabric is emulated, guest OS will not see non FCP target ports (for example initiators) and will not be able to communicate with ELS/CT over fabric.
Example:
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lun_exclude
The list of the LUNs to be excluded. If empty (default), nothing is excluded.
No multi line is possible for this parameter; the maximum number of symbols inside the double quotes is 255. Use "lun_include" parameter instead if a lot of LUNs must be excluded to specify only the included LUNs.
Example:
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lun_exclude parameter cannot exclude storage mapped to LUN 0 because of its special function. |
lun_include
The list of the LUNs to be included. If empty (default), all LUNs are included. No multi line is possible for this parameter; the maximum number of symbols inside the double quotes is 255. Use "lun_exclude" parameter instead if a lot of LUNs must be included to specify only the excluded LUNs.
Example:
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scsi_version
This approach of FC emulation downgrades all attached devices to the specifically defined version of SCSI. This is done to make legacy guest operating systems happy with attached modern devices.
| Value (ANSI SCSI version) | Description |
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any | Any version |
v1 | SCSI-1 |
| v2 | SCSI-2 |
| v3 | SCSI-3 |
| v3_SPC1 | SCSI-3, primary command level 1 |
| v3_SPC2 | SCSI-3, primary command level 2 (default) |
| v3_SPC3 | SCSI-3, primary command level 3 |
| v3_SPC4 | SCSI-3, primary command level 4 |
Refer to your guest OS documentation for more details and public resources for general specification of SCSI.
Example:
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device_id
A fake device id (if not "lp8000" is needed), the default is "0xF800" ("lp8000").
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This parameter is needed for some specific cases only, so it is strongly recommended not to specify any value without particular instructions from Stromasys. |
Example:
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vendor_id
A fake vendor id (if not "lp8000" is needed), the default is "0x10DF" ("lp8000").
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This parameter is needed for some specific cases only, so it is strongly recommended not to specify any value without particular instructions from Stromasys. |
Example:
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revision_id
A fake revision id (if not "lp8000" is needed), the default is "0x02" ("lp8000").
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This parameter is needed for some specific cases only, so it is strongly recommended not to specify any value without particular instructions from Stromasys. |
Example:
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scsi_serialize_io
This parameter controls serialization of the SCSI requests.
| Value | Description |
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false | Responses delivered to the emulated KGPSA card in order they were submitted to Linux. This is the default value. |
true | Responses delivered to the emulated KGPSA card in order they were completed by Linux |
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This parameter is needed for some specific cases only, so it is strongly recommended not to specify any value without particular instructions from Stromasys. |
Example:
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scsi_max_queue_depth
This parameter sets limitation of the SCSI queue depth per LUN
| Value | Description |
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unlimited | Linux SG I/O applies limitation of 16 I/Os. Requests are submitted unless write to SG I/O fails. This is the default value. |
1...16 | Only the specified number of the requests are submitted in parallel. |
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This parameter is needed for some specific cases only, so it is strongly recommended not to specify any value without particular instructions from Stromasys. |
Example:
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