Hi Nic,
I'm currently trying to simulate an ALUA setup with tcm_loop.
What I did was to create one fileio backend two alua target portal
groups:
target/core/fileio_0
target/core/fileio_0/disk1
target/core/fileio_0/disk1/alua/default_tg_pt_gp
# cat target/core/fileio_0/disk1/alua/default_tg_pt_gp/tg_pt_gp_id
0
target/core/fileio_0/disk1/alua/secondary_tg_pt_gp
# cat target/core/fileio_0/disk1/alua/secondary_tg_pt_g/tg_pt_gp_id
1
And one tcm_loop HBA with two tgpts:
# cat loopback/naa.60014056caf7d8fc/tpgt_0/lun/lun_0/alua_tg_pt_gp
TG Port Alias: default_tg_pt_gp
TG Port Group ID: 0
TG Port Primary Access State: Standby
TG Port Primary Access Status: Altered by Implicit ALUA
TG Port Secondary Access State: None
TG Port Secondary Access Status: None
# cat loopback/naa.60014056caf7d8fc/tpgt_1/lun/lun_0/alua_tg_pt_gp
TG Port Alias: secondary_tg_pt_gp
TG Port Group ID: 1
TG Port Primary Access State: Active/Optimized
TG Port Primary Access Status: Altered by Implicit ALUA
TG Port Secondary Access State: None
TG Port Secondary Access Status: None
REPORT TARGET PORT GROUPS reports this layout correctly:
# sg_rtpg /dev/sdb
Report target port groups:
target port group id : 0x0 , Pref=0
target port group asymmetric access state : 0x02
T_SUP : 1, O_SUP : 1, LBD_SUP : 0, U_SUP : 1, S_SUP : 1, AN_SUP
: 1, AO_SUP : 1
status code : 0x02
vendor unique status : 0x00
target port count : 01
Relative target port ids:
0x04
target port group id : 0x1 , Pref=0
target port group asymmetric access state : 0x00
T_SUP : 1, O_SUP : 1, LBD_SUP : 0, U_SUP : 1, S_SUP : 1, AN_SUP
: 1, AO_SUP : 1
status code : 0x02
vendor unique status : 0x00
target port count : 01
Relative target port ids:
0x05
But the VPD page 0x83 information is wrong:
# sg_vpd -p di /dev/sdb
Device Identification VPD page:
Addressed logical unit:
designator type: NAA, code set: Binary
0x6001405de00000000000000000000000
designator type: T10 vendor identification, code set: ASCII
vendor id: LIO-ORG
vendor specific: FILEIO:uuidgen
designator type: Logical unit group, code set: Binary
Logical unit group: 0x0
Target port:
designator type: Relative target port, code set: Binary
transport: Serial Attached SCSI Protocol (SPL-3)
Relative target port: 0x4
designator type: Target port group, code set: Binary
transport: Serial Attached SCSI Protocol (SPL-3)
Target port group: 0x0
[ .. ]
# sg_vpd -p di /dev/sdc
Device Identification VPD page:
Addressed logical unit:
designator type: NAA, code set: Binary
0x6001405de00000000000000000000000
designator type: T10 vendor identification, code set: ASCII
vendor id: LIO-ORG
vendor specific: FILEIO:uuidgen
designator type: Logical unit group, code set: Binary
Logical unit group: 0x0
Target port:
designator type: Relative target port, code set: Binary
transport: Serial Attached SCSI Protocol (SPL-3)
Relative target port: 0x4
designator type: Target port group, code set: Binary
transport: Serial Attached SCSI Protocol (SPL-3)
Target port group: 0x0
IE the second device refers to the information from the _first_ device.
I've tried to step through the code, to the number of lists and
backreferences got me confused ...
But it looks as if core_alua_store_tg_pt_gp_info() does not
rearrange all required the information and pointers.
Cheers,
Hannes
--
Dr. Hannes Reinecke zSeries & Storage
hare@xxxxxxx +49 911 74053 688
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: J. Hawn, J. Guild, F. Imendörffer, HRB 21284 (AG Nürnberg)
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