Good evening!
Could I get a couple pairs of eyes on this RFE?
7088826 <http://monaco.us.oracle.com/detail.jsf?cr=7088826> target
discovery needs augmentation to handle aliases, wwn, and
active/passive paths
https://cr.opensolaris.org/action/browse/caiman/drewfish/7088826/webrev/
Testing for this one has been all kinds of fun! My test system is a
SPARC T1000 with a FC HBA attached.
Here's my format output:
AVAILABLE DISK SELECTIONS:
0. c2t0d0 <SUN82G cyl 65533 alt 2 hd 16 sec 153>
/pci@7c0/pci@0/pci@8/scsi@2/sd@0,0
1. c3t200600A0B821FC0Bd0 <SUN-CSM100_R_FC-0660 cyl 10238 alt 2
hd 64 sec 64>
/pci@780/SUNW,qlc@0,1/fp@0,0/ssd@w200600a0b821fc0b,0
2. c3t266000C0FFE080C4d0 <SUN-StorEdge 3511-421F cyl 65533 alt
2 hd 64 sec 348>
/pci@780/SUNW,qlc@0,1/fp@0,0/ssd@w266000c0ffe080c4,0
3. c4t200700A0B821FC0Ad0 <drive type unknown>
/pci@780/SUNW,qlc@0/fp@0,0/ssd@w200700a0b821fc0a,0
4. c4t226000C0FF9080C4d0 <SUN-StorEdge 3511-421F cyl 65533 alt
2 hd 64 sec 348>
/pci@780/SUNW,qlc@0/fp@0,0/ssd@w226000c0ff9080c4,0
Disk 0 is simply the internal disk and not interesting, so ignore that.
Disks 1 and 3 are the same disk. The HBA is set up in "active /
passive" mode. This means that the passive disk is all but offline.
It'll answer to format and libdiskmgt but low-level read(2) calls
will fail. It's how I'm identifying a passive disk.
Disks 2 and 4 are the same disk. The difference is that they are
both "active" This means they behave exactly like a regular disk.
With this new code, only 3 disks (in this example) are "discovered".
The boot disk and the first "active" path in each pair. All passive
paths are not discovered. All additional active aliases are not
discovered. This prevents the user from specifying one active alias
for one zpool and another active alias for a second zpool. Remember,
this would be the same physical disk on the back-end and that would
be .... not good ^(TM).
When target discovery finds a passive disk, it records the CTD string
in an attribute in the active Disk object so we can match on it
later. When target discovery finds multiple active aliases for the
same disk, we construct a Disk object out of the first alias and
record any additional aliases for later matching.
This likely will only present itself on SPARC machines due to CR
6969682. mpxio is disabled by default on SPARC. If mpxio is
enabled, the format output is totally different. mpxio would handle
all of the multipathing and make the entire thing completely
transparent to the user.
Testing
------
I tested AI manifests which specify a passive disk (disk 3 in the
format output):
20:18:12 Error occurred during execution of 'target-selection'
checkpoint.
20:18:12 Failed Checkpoints:
20:18:12
20:18:12 target-selection
20:18:12
20:18:12 Checkpoint execution error:
20:18:12
20:18:12 Unable to locate the disk 'c4t200700A0B821FC0Ad0' on
the system.
20:18:12
20:18:12 Automated Installation Failed. See install log at
/system/volatile/install_log
I tested AI manifests with two active CTDs to the same physical disk
(disk 2 and 4):
20:17:48 Error occurred during execution of 'target-selection'
checkpoint.
20:17:48 Failed Checkpoints:
20:17:48
20:17:48 target-selection
20:17:48
20:17:48 Checkpoint execution error:
20:17:48
20:17:48 Disk 'c4t226000C0FF9080C4d0' matches already used
disk 'c3t266000C0FFE080C4d0'.
20:17:48
20:17:48 Automated Installation Failed. See install log at
/system/volatile/install_log
I tested specifying the second active alias (disk 4). AI proceeded
normally and installed to disk 2, exactly as it should.
Naturally, all other tests run as expected and pass with no new
regressions.
Darren: Does anything specific have to be done with my changing of
the DTD for versioning?
Thanks!
-Drew
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