diff options
author | greg@kroah.com <greg@kroah.com> | 2004-10-06 18:32:41 -0700 |
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committer | Greg KH <gregkh@suse.de> | 2005-04-26 21:37:03 -0700 |
commit | 71144b744acb191d357dbfeb85a256389d4fac3b (patch) | |
tree | 15aa6e4ccb9b51c25e14a2b2cfe1c9f278e73f68 /extras/multipath-tools/README | |
parent | 33eae955e24feb2e473b905d64de17ad641e57e0 (diff) |
[PATCH] delete extras/multipath-tools as per the author's request
This is now a standalone package.
Diffstat (limited to 'extras/multipath-tools/README')
-rw-r--r-- | extras/multipath-tools/README | 90 |
1 files changed, 0 insertions, 90 deletions
diff --git a/extras/multipath-tools/README b/extras/multipath-tools/README deleted file mode 100644 index 80945db438..0000000000 --- a/extras/multipath-tools/README +++ /dev/null @@ -1,90 +0,0 @@ -Dependancies : -============== - -o libdevmapper : comes with device-mapper-XXXX.tar.gz - See www.sistina.com - This lib has been dropped in the multipath tree -o libsysfs : comes with sysutils or udev - See ftp.kernel.org/pub/linux/utils/kernel/hotplug/ -o Linux kernel 2.6.0 with udm5 patchset - http://people.sistina.com/~thornber/dm/ -o udev - See ftp.kernel.org/pub/linux/utils/kernel/hotplug/ - -How it works : -============== - -Fill the all_paths array. Each path store this info : - -struct path { - char dev[FILE_NAME_SIZE]; - char sg_dev[FILE_NAME_SIZE]; - struct scsi_idlun scsi_id; - struct sg_id sg_id; - int state; - char wwid[WWID_SIZE]; -}; - -scsi_id, sg_dev and sg_id are only really useful for 2.4 -kernels, for which SG cmnds must go through sg devs. -In 2.5+ we have the nice opportunity to send SG cmnds -through SCSI bdevs. - -For 2.4 compat, we pivot on idlun tupple to map sg devs -to SCSI bdevs. - -2.4 does not do device enumeration, so we must scan a -defined number of sg devs and scsi bdevs. Good enough. -In 2.5+, we rely on libsysfs (sysutils) to access to -sysfs device enums. - -the wwid is retrieved by a switch fonction. Only White -Listed HW can filled this field. For now every FC array -HW listed in kernel's devinfo.c is White Listed, assuming -the WWID is stored is the SCSI-3 standard 0x83 EVPD page. - -When all_paths is filled, we coalesce the paths and store -the result in mp array. Each mp is a struct like this : - -struct multipath { - char wwid[WWID_SIZE]; - int npaths; - int pindex[MAX_MP_PATHS]; -}; - -When mp is filled, the device maps are fed to the kernel -through libdevmapper. - -The naming of the corresponding block device is handeld -by udev with the help of the devmap_name proggy. It is -called by the following rule in /etc/udev/udev.rules : -KERNEL="dm-[0-9]*", PROGRAM="/sbin/devmap_name %M %m", \ -NAME="%k", SYMLINK="%c" - -Notes : -======= - -o On 2.4, make sure you have enough /dev/sg* nodes - (/dev/MAKEDEV if necesary). Same goes for /dev/sd* - -o path coalescing relies on a path unique id being found. - This unique id, lacking a standard method, is vendor - specific. A switch function (get_unique_id) is present - and an example function is provided for storageworks - arrays (get_evpd_wwid). Feel free to enrich - with hardware you have at hand :) - -o The kernel does NOT manage properly ghosts paths - with StorageWorks HW. Seems nobody cares after a load - of posts to linux-scsi. - -o 2.4.21 version of DM does not like even segment size. - if you enconter pbs with this, upgrade DM. - -Credits : -========= - -o Heavy cut'n paste from sg_utils. Thanks goes to D. - Gilbert. -o Light cut'n paste from dmsetup. Thanks Joe Thornber. -o Greg KH for the nice sysfs API. |