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Re: [dm-devel] [PATCH] multipath: change default configuration parameters

On 01/16/2013 10:24 PM, Christophe Varoqui wrote:
On mar., 2013-01-15 at 23:14 +0100, Xose Vazquez Perez wrote:
scsi_id is going to be replaced in systemd(recently udev was
included in systemd).

See sg_inq(--export option) from sg3_utils.

We will need to patch sg_inq to report a denser id than the documented

Why? It took me ages to implement that one properly.
And it's only strings, which can be expanded at will.
Plus I have a set of udev rules mangling those into the usual ID_XXX variables.

I don't see why we need to change that ...

Time to launch a debate over the pertinence to maintain the '3' prefix
scsi_id insisted on prepending to the wwids ... Lennart will take the
blame without flinching I'm sure ;)

It's not '3'.

The '3' is the VPD designator ID as defined in the spec. And it's attached there so that you can differentiate between several IDs, which might be identical otherwise.

The original idea behind the prefix was that each ID has a different level of 'uniqueness'.
Basically, there are 5 possible designator IDs for the LUN:

0: Vendor specific
1: T10 Vendor ID based
2: EUI-64 based
3: NAA
8: SCSI Name string

of which 0, 1, and 8 are basically arbitrary. We only have a guaranteed unique ID when the designator is of type 2 or 3. So prefixing the designator number allows you to figure out whether it's a good idea for using that ID.

Mind you, that was when all was encoded in scsi_id.
Now that's all open-coded with udev rules you have different variables for each ID, so it's easy to figure out.

But sorry, we can't change that.
Upgrade will be _HELL_ if you do that.

Btw, a patch to the udev rules is attached. It's not yet included in the upstream sources as Kay and I are still discussing whether we should split the original rule set.


Dr. Hannes Reinecke		      zSeries & Storage
hare suse de			      +49 911 74053 688
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: J. Hawn, J. Guild, F. Imendörffer, HRB 16746 (AG Nürnberg)
diff --git a/rules/rules.d/60-persistent-storage.rules b/rules/rules.d/60-persistent-storage.rules
index 1c4c2b2..a8377c6 100644
--- a/rules/rules.d/60-persistent-storage.rules
+++ b/rules/rules.d/60-persistent-storage.rules
@@ -38,17 +38,35 @@ KERNEL=="sd*[!0-9]|sr*", ENV{ID_SERIAL}!="?*", SUBSYSTEMS=="ata", IMPORT{program
 # ATA devices using the "scsi" subsystem
 KERNEL=="sd*[!0-9]|sr*", ENV{ID_SERIAL}!="?*", SUBSYSTEMS=="scsi", ATTRS{vendor}=="ATA", IMPORT{program}="ata_id --export $tempnode"
 # scsi devices
-KERNEL=="sd*[!0-9]|sr*", ENV{ID_SERIAL}!="?*", IMPORT{program}="scsi_id --export --whitelisted -d $tempnode", ENV{ID_BUS}="scsi"
-KERNEL=="cciss*", ENV{DEVTYPE}=="disk", ENV{ID_SERIAL}!="?*", IMPORT{program}="scsi_id --export --whitelisted -d $tempnode", ENV{ID_BUS}="cciss"
+KERNEL=="sd*[!0-9]|sr*", IMPORT{program}="/usr/bin/sg_inq --export  $tempnode", ENV{ID_BUS}="scsi"
+KERNEL=="cciss*", ENV{DEVTYPE}=="disk", ENV{ID_SERIAL}!="?*", IMPORT{program}="/usr/bin/sg_inq --export $tempnode", ENV{ID_BUS}="cciss"
+# Select which identifier to use per default
+# 1: NAA IEEE Registered Extended identifier
+# 2: NAA IEEE Registered identifier
+# 3: Unspecified NAA identfier
+# 4: EUI-64 identifer
+# 5: SCSI name identifier
+# 6: T10 Vendor identifer
+# 7: Vendor-specific identifier
 KERNEL=="sd*|sr*|cciss*", ENV{DEVTYPE}=="disk", ENV{ID_SERIAL}=="?*", SYMLINK+="disk/by-id/$env{ID_BUS}-$env{ID_SERIAL}"
 KERNEL=="sd*|cciss*", ENV{DEVTYPE}=="partition", ENV{ID_SERIAL}=="?*", SYMLINK+="disk/by-id/$env{ID_BUS}-$env{ID_SERIAL}-part%n"
+KERNEL=="sd*[!0-9]|sr*", ENV{ID_SCSI_SERIAL}!="?*", IMPORT{program}="/usr/bin/sg_inq --export -p 0x80 $tempnode", ENV{ID_SCSI_SERIAL}="$env{SCSI_IDENT_SERIAL}"
+KERNEL=="cciss*", ENV{DEVTYPE}=="disk", ENV{ID_SCSI_SERIAL}!="?*", IMPORT{program}="/usr/bin/sg_inq --export -p 0x80 $tempnode", ENV{ID_SCSI_SERIAL}="$env{SCSI_IDENT_SERIAL}"
 # firewire
 KERNEL=="sd*[!0-9]|sr*", ATTRS{ieee1394_id}=="?*", SYMLINK+="disk/by-id/ieee1394-$attr{ieee1394_id}"
 KERNEL=="sd*[0-9]", ATTRS{ieee1394_id}=="?*", SYMLINK+="disk/by-id/ieee1394-$attr{ieee1394_id}-part%n"
 # scsi compat links for ATA devices
-KERNEL=="sd*[!0-9]", ENV{ID_BUS}=="ata", PROGRAM="scsi_id --whitelisted --replace-whitespace -p0x80 -d$tempnode", RESULT=="?*", ENV{ID_SCSI_COMPAT}="$result", SYMLINK+="disk/by-id/scsi-$env{ID_SCSI_COMPAT}"
+KERNEL=="sd*[!0-9]", ENV{ID_BUS}=="ata", ENV{SCSI_IDENT_SERIAL}=="?*", ENV{ID_SCSI_COMPAT}="$env{SCSI_IDENT_SERIAL}", SYMLINK+="disk/by-id/scsi-$env{ID_SCSI_COMPAT}"
 KERNEL=="sd*[0-9]", ENV{ID_SCSI_COMPAT}=="?*", SYMLINK+="disk/by-id/scsi-$env{ID_SCSI_COMPAT}-part%n"
 KERNEL=="mmcblk[0-9]", SUBSYSTEMS=="mmc", ATTRS{name}=="?*", ATTRS{serial}=="?*", ENV{ID_NAME}="$attr{name}", ENV{ID_SERIAL}="$attr{serial}", SYMLINK+="disk/by-id/mmc-$env{ID_NAME}_$env{ID_SERIAL}"

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