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Re: [dm-devel] multipath disk size



URZ- AG a écrit :
Hi,

I'm posting my question again, i would really appreciate if someone could give me a hint why this happen.


I'm trying to setup a FC Storage (Adaptec SANBloc 2Gb) using multipath
(Kernel 2.6.15 - multipath-tool-0.4.7 on Fedora Core 5 )
Everything seem to run right, but the disk created by multipath does not
reflect the physical one.
I do have a physical volume that is about 67GB big, when multipath
creates the dm device it is at least 1GB.
Here is the output of multipath -v3:
----------------------------------------------------
dm-0: blacklisted
dm-1: blacklisted
dm-2: blacklisted
dm-4: blacklisted
dm-5: blacklisted
fd0: blacklisted
hdd: blacklisted
md0: blacklisted
ram0: blacklisted
ram10: blacklisted
ram11: blacklisted
ram12: blacklisted
ram13: blacklisted
ram14: blacklisted
ram15: blacklisted
ram1: blacklisted
ram2: blacklisted
ram3: blacklisted
ram4: blacklisted
ram5: blacklisted
ram6: blacklisted
ram7: blacklisted
ram8: blacklisted
ram9: blacklisted
sda: not found in pathvec
sda: mask = 0x1f
sda: bus = 1
sda: dev_t = 8:0
sda: size = 71553024
sda: vendor = LSILOGIC
sda: product = 1030          IM
sda: rev = 1000
sda: h:b:t:l = 0:0:1:0
sda: serial =
sda: path checker = readsector0 (config file default)
sda: state = 2
sda: getprio = /bin/true (config file default)
sda: prio = 0
sda: getuid = /sbin/scsi_id -g -u -s /block/%n (config file default)
error calling out /sbin/scsi_id -g -u -s /block/sda
sdb: not found in pathvec
sdb: mask = 0x1f
sdb: bus = 1
sdb: dev_t = 8:16
sdb: size = 142114816
sdb: vendor = EUROLOGC
sdb: product = FC2502
sdb: rev = 7902
sdb: h:b:t:l = 2:0:0:0
sdb: tgt_node_name = 0x20000080e512dc77
sdb: serial = 0000dc7720000080e512dc770000000000000000
sdb: path checker = readsector0 (controler setting)
sdb: state = 2
sdb: getprio = /bin/true (config file default)
sdb: prio = 0
sdb: getuid = /sbin/scsi_id -g -u -p 0x80 -s /block/%n (controler setting)
sdb: uid = SEUROLOGCFC2502_0000dc7720000080e512dc770000000000000000
(callout)
sdc: not found in pathvec
sdc: mask = 0x1f
sdc: bus = 1
sdc: dev_t = 8:32
sdc: size = 142114816
sdc: vendor = EUROLOGC
sdc: product = FC2502
sdc: rev = 7902
sdc: h:b:t:l = 2:0:1:0
sdc: tgt_node_name = 0x20000080e512dc77
sdc: serial = 0000dc7720000080e512dc770000000000000000
sdc: path checker = readsector0 (controler setting)
sdc: state = 2
sdc: getprio = /bin/true (config file default)
sdc: prio = 0
sdc: getuid = /sbin/scsi_id -g -u -p 0x80 -s /block/%n (controler setting)
sdc: uid = SEUROLOGCFC2502_0000dc7720000080e512dc770000000000000000
(callout)
===== paths list =====
uuid                                                     hcil    dev
dev_t pri
0:0:1:0 sda 8:0 0 SEUROLOGCFC2502_0000dc7720000080e512dc770000000000000000 2:0:0:0 sdb 8:16 0 SEUROLOGCFC2502_0000dc7720000080e512dc770000000000000000 2:0:1:0 sdc 8:32 0
8:16 ownership set to hdmail
sdb: not found in pathvec
sdb: mask = 0xc
sdb: state = 2
sdb: prio = 0
8:32 ownership set to hdmail
sdc: not found in pathvec
sdc: mask = 0xc
sdc: state = 2
sdc: prio = 0
hdmail: pgfailback = -2 (config file default)
hdmail: pgpolicy = failover (controler setting)
hdmail: selector = round-robin 0 (controler setting)
hdmail: features = 0 (internal default)
hdmail: hwhandler = 0 (internal default)
hdmail: rr_weight = 2 (config file default)
hdmail: minio = 100 (config file default)
hdmail: no_path_retry = -1 (config file default)
hdmail: set ACT_CREATE (map does not exist)
hdmail: set ACT_CREATE (map does not exist)
create: hdmail (SEUROLOGCFC2502_0000dc7720000080e512dc770000000000000000)
[size=1 GB][features=0][hwhandler=0]
\_ round-robin 0 [prio=0][undef]
\_ 2:0:0:0 sdb 8:16  [undef][ready]
\_ round-robin 0 [prio=0][undef]
\_ 2:0:1:0 sdc 8:32  [undef][ready]
----------------------------------------------------
When you look at the disk size, it return the correct value but when it
creates the dm device it does it too small.

When I do create the multipath device using dmsetup it creates it with the right size, but as soon as I do runf multipath again it resize the device.

Thanks a lot for your work and your help

Thanks for this report.

I can't reproduce this here.

I'm afraid I'll have to ask you to try and refine your report though.
Use a debugger to track [m]pp->size changes, or try adding debugging output in the key code areas : add_map_with_path(), coalesce_paths(), ...

Regards,
cvaroqui


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