gmultipath, ses and shared disks / cant seem to share between local nodes
Outback Dingo
outbackdingo at gmail.com
Thu Apr 18 00:28:24 UTC 2013
On Wed, Apr 17, 2013 at 8:05 PM, Teske, Devin <Devin.Teske at fisglobal.com>wrote:
>
> On Apr 17, 2013, at 4:56 PM, Outback Dingo wrote:
>
>
>
>
> On Wed, Apr 17, 2013 at 7:29 PM, Teske, Devin <Devin.Teske at fisglobal.com>wrote:
>
>>
>> On Apr 17, 2013, at 4:10 PM, Outback Dingo wrote:
>>
>>
>>
>>
>> On Wed, Apr 17, 2013 at 6:39 PM, Teske, Devin <Devin.Teske at fisglobal.com>wrote:
>>
>>>
>>> On Apr 17, 2013, at 3:26 PM, Outback Dingo wrote:
>>>
>>> > Ok, maybe im at a loss here in the way my brain is viewing this
>>> >
>>> > we have a box, its got 2 nodes in the chassis, and 32 sata drives
>>> > attached to a SATA/SAS backplane via 4 (2 per node) LSI MPT SAS2 cards
>>> > should i not logically be seeing 4 controllers X #drive count ??
>>> >
>>> > camcontrol devlist shows 32 devices, daX,passX and sesX,passX
>>> >
>>> > <SEAGATE ST33000650SS 0004> at scbus0 target 9 lun 0 (da0,pass0)
>>> > <STORBRICK-3 1400> at scbus0 target 10 lun 0 (ses0,pass1)
>>> > <SEAGATE ST33000650SS 0004> at scbus0 target 11 lun 0
>>> (da1,pass2)
>>> > <STORBRICK-1 1400> at scbus0 target 12 lun 0 (ses1,pass3)
>>> > <SEAGATE ST33000650SS 0004> at scbus0 target 13 lun 0
>>> (da2,pass4)
>>> > <STORBRICK-2 1400> at scbus0 target 14 lun 0 (ses2,pass5)
>>> > <SEAGATE ST33000650SS 0004> at scbus0 target 15 lun 0
>>> (da3,pass6)
>>> > <STORBRICK-4 1400> at scbus0 target 16 lun 0 (ses3,pass7)
>>> > <SEAGATE ST33000650SS 0004> at scbus0 target 17 lun 0
>>> (da4,pass8)
>>> > <STORBRICK-6 1400> at scbus0 target 18 lun 0 (ses4,pass9)
>>> > <SEAGATE ST33000650SS 0004> at scbus0 target 19 lun 0
>>> (da5,pass10)
>>> > <STORBRICK-0 1400> at scbus0 target 20 lun 0 (ses5,pass11)
>>> > <SEAGATE ST33000650SS 0004> at scbus0 target 21 lun 0
>>> (da6,pass12)
>>> > <STORBRICK-7 1400> at scbus0 target 22 lun 0 (ses6,pass13)
>>> > <SEAGATE ST33000650SS 0004> at scbus0 target 23 lun 0
>>> (da7,pass14)
>>> > <STORBRICK-5 1400> at scbus0 target 24 lun 0 (ses7,pass15)
>>> > <SEAGATE ST9300605SS 0004> at scbus1 target 0 lun 0
>>> (da8,pass16)
>>> > <SEAGATE ST9300605SS 0004> at scbus1 target 1 lun 0
>>> (da9,pass17)
>>> > <STORBRICK-3 1400> at scbus8 target 10 lun 0 (ses8,pass19)
>>> > <SEAGATE ST33000650SS 0004> at scbus8 target 11 lun 0
>>> (da11,pass20)
>>> > <STORBRICK-1 1400> at scbus8 target 12 lun 0 (ses9,pass21)
>>> > <SEAGATE ST33000650SS 0004> at scbus8 target 13 lun 0
>>> (da12,pass22)
>>> > <STORBRICK-2 1400> at scbus8 target 14 lun 0 (ses10,pass23)
>>> > <SEAGATE ST33000650SS 0004> at scbus8 target 15 lun 0
>>> (da13,pass24)
>>> > <STORBRICK-4 1400> at scbus8 target 16 lun 0 (ses11,pass25)
>>> > <SEAGATE ST33000650SS 0004> at scbus8 target 17 lun 0
>>> (da14,pass26)
>>> > <STORBRICK-6 1400> at scbus8 target 18 lun 0 (ses12,pass27)
>>> > <SEAGATE ST33000650SS 0004> at scbus8 target 19 lun 0
>>> (da15,pass28)
>>> > <STORBRICK-0 1400> at scbus8 target 20 lun 0 (ses13,pass29)
>>> > <SEAGATE ST33000650SS 0004> at scbus8 target 21 lun 0
>>> (da16,pass30)
>>> > <STORBRICK-7 1400> at scbus8 target 22 lun 0 (ses14,pass31)
>>> > <SEAGATE ST33000650SS 0004> at scbus8 target 23 lun 0
>>> (da17,pass32)
>>> > <STORBRICK-5 1400> at scbus8 target 24 lun 0 (ses15,pass33)
>>> > <USB 2.0 Flash Drive 8.07> at scbus9 target 0 lun 0
>>> (da18,pass34)
>>> >
>>> >
>>> > we would like to create a zpool from all the devices, that in theory if
>>> > nodeA failed
>>> > then nodeB could force import the pool,
>>>
>>> gmultipath (which you mention in the subject) is the appropriate tool
>>> for this, but there's no need for an import of the pool if you build the
>>> pool out of multipath devices. In our experience, we can pull a cable and
>>> zfs continues working just fine.
>>>
>>> In other words, don't build the pool out of the devices, put a
>>> gmultipath label on each device and then use /dev/multipath/LABEL for the
>>> zpool devices.
>>>
>>>
>>> > nodeA and NodeB are attached through
>>> > dual LSI controllers, to the SATA/SAS backplane. but i cant seem to
>>> create
>>> > a zpool from sesX or passX devices, i can however create a 16 drive
>>> zp0ol
>>> > on either node, from any daX device. what did i miss? ive looked at
>>> > gmirror, and also ses documents. Any insight is appreciated, thanks in
>>> > advance.
>>>
>>> gmirror is the wrong tool, gmultipath is what you want. The basic task
>>> is to use "gmultipath label FOO da#" to write a cookie on the disk (used to
>>> identify new/existing paths during GOEM "taste" events for example).
>>>
>>> After you've labeled the da# devices with gmultipath you say "gmultipath
>>> status" to see the components of each label and you use "multipath/LABEL"
>>> as your disk name when creating the zpool (these correspond directly to
>>> /dev/multipath/LABEL, but "zpool create …" or "zpool add …" allow you to
>>> omit the leading "/dev").
>>>
>>
>> sanity check me on node A i did
>>
>> zpool destroy master
>>
>> gmultipath label FOO da0
>>
>> gmultipath status
>> Name Status Components
>> multipath/FOO DEGRADED da0 (ACTIVE)
>> multipath/FOO-619648737 DEGRADED da1 (ACTIVE)
>> multipath/FOO-191725652 DEGRADED da2 (ACTIVE)
>> multipath/FOO-1539342315 DEGRADED da3 (ACTIVE)
>> multipath/FOO-1276041606 DEGRADED da4 (ACTIVE)
>> multipath/FOO-2000832198 DEGRADED da5 (ACTIVE)
>> multipath/FOO-1285640577 DEGRADED da6 (ACTIVE)
>> multipath/FOO-1816092574 DEGRADED da7 (ACTIVE)
>> multipath/FOO-1102254444 DEGRADED da8 (ACTIVE)
>> multipath/FOO-330300690 DEGRADED da9 (ACTIVE)
>> multipath/FOO-92140635 DEGRADED da10 (ACTIVE)
>> multipath/FOO-855257672 DEGRADED da11 (ACTIVE)
>> multipath/FOO-1003634134 DEGRADED da12 (ACTIVE)
>> multipath/FOO-2449862 DEGRADED da13 (ACTIVE)
>> multipath/FOO-1137080233 DEGRADED da14 (ACTIVE)
>> multipath/FOO-1696804371 DEGRADED da15 (ACTIVE)
>> multipath/FOO-1304457562 DEGRADED da16 (ACTIVE)
>> multipath/FOO-912159854 DEGRADED da17 (ACTIVE)
>>
>> now on node B i should do the same? reboot both nodes and i should be
>> able "see" 32 multipath/FOO deices to create a pool from ?
>>
>>
>> It appears from the above output that you labeled all of the block
>> devices (da0 through da17) with the same label.
>>
>> This is not what you want.
>>
>> Use "gmultipath clear FOO" on each of the block devices and have
>> another go using unique values.
>>
>> For example:
>>
>> gmultipath label SATA_LUN01 da0
>> gmultipath label SATA_LUN02 da1
>> gmultipath label SATA_LUN03 da2
>> gmultipath label SATA_LUN04 da3
>> gmultipath label SATA_LUN05 da4
>> gmultipath label SATA_LUN06 da5
>> gmultipath label SATA_LUN07 da6
>> gmultipath label SATA_LUN08 da7
>> gmultipath label SATA_LUN09 da8
>> gmultipath label SATA_LUN10 da9
>> gmultipath label SATA_LUN11 da10
>> gmultipath label SATA_LUN12 da11
>> gmultipath label SATA_LUN13 da12
>> gmultipath label SATA_LUN14 da13
>> gmultipath label SATA_LUN15 da14
>> gmultipath label SATA_LUN16 da15
>> gmultipath label SATA_LUN17 da16
>> gmultipath label SATA_LUN18 da17
>> ..
>>
>> Then "gmultipath status" should show your unique labels each with a
>> single component.
>>
>> Then you would do:
>>
>> zpool create master multipath/SATA_LUN{01,02,03,04,05,06,…}
>>
>>
> ahh ok got it, and probably on the other node
>
> gmultipath label SATA_LUN19 da0
> gmultipath label SATA_LUN20 da1
>
> -------------------snip------------------------------
>
> gmultipath label SATA_LUN36 da15
>
>
> No. You do not need to label the other "node"
>
> Since the "gmultipath label …" command writes data to the disk, you do
> not need to label the disk multiple times (and in fact would be an error
> to). Rather, as the system is probing and adding disks, it will
> automatically detect multiple paths based on this data stored on the disk.
>
> Read: If da0 and another da# device are indeed two paths to the same
> device, then as those devices are probed by the kernel, "gmultipath status"
> will dynamically show the newly discovered paths.
>
> If, after labeling all the devices on a single path you find that
> "gmultipath status" still shows only one component for each label, try
> rebooting. If still after a reboot "gmultipath status" only shows a single
> component for each label, then clearly you are not configured (hardware
> wise) for multiple paths to the same components (and this may be where the
> "gmultipath" versus "gmirror" nit that I caught in your original post comes
> into play -- maybe "gmultipath" was the wrong thing to put in the subject
> if you don't have multiple paths to the same components but instead have a
> mirrored set of components that you want to gmirror all your data to a
> second pool -- if that ends up being the case, then I would actually
> recommend a zfs send/receive cron-job based on snapshots to utilize the
> performance of ZFS Copy On Write rather than perhaps gmirror; but your
> mileage may vary).
> --
>
well nodeA sees daX devices, where nodeB does also however the serials for
da0 are different on both nodes
it seems NodeA sees NodeB drives as sesX/(daX,passX)
and NodeB sees NodeA drives as sesX/(daX,passX)
each node sees pass0 to pass32 so i would think the 4 LSI controllers
connected to the backplane see all 32 SATA drives in the enclosure
nodeA drive list
camcontrol devlist
<SEAGATE ST33000650SS 0004> at scbus0 target 9 lun 0 (da0,pass0)
<SGI CORP STORBRICK-3 1400> at scbus0 target 10 lun 0 (ses0,pass1)
<SEAGATE ST33000650SS 0004> at scbus0 target 11 lun 0 (da1,pass2)
<SGI CORP STORBRICK-1 1400> at scbus0 target 12 lun 0 (ses1,pass3)
<SEAGATE ST33000650SS 0004> at scbus0 target 13 lun 0 (da2,pass4)
<SGI CORP STORBRICK-2 1400> at scbus0 target 14 lun 0 (ses2,pass5)
<SEAGATE ST33000650SS 0004> at scbus0 target 15 lun 0 (da3,pass6)
<SGI CORP STORBRICK-4 1400> at scbus0 target 16 lun 0 (ses3,pass7)
<SEAGATE ST33000650SS 0004> at scbus0 target 17 lun 0 (da4,pass8)
<SGI CORP STORBRICK-6 1400> at scbus0 target 18 lun 0 (ses4,pass9)
<SEAGATE ST33000650SS 0004> at scbus0 target 19 lun 0 (da5,pass10)
<SGI CORP STORBRICK-0 1400> at scbus0 target 20 lun 0 (ses5,pass11)
<SEAGATE ST33000650SS 0004> at scbus0 target 21 lun 0 (da6,pass12)
<SGI CORP STORBRICK-7 1400> at scbus0 target 22 lun 0 (ses6,pass13)
<SEAGATE ST33000650SS 0004> at scbus0 target 23 lun 0 (da7,pass14)
<SGI CORP STORBRICK-5 1400> at scbus0 target 24 lun 0 (ses7,pass15)
<SEAGATE ST9300605SS 0004> at scbus1 target 0 lun 0 (da8,pass16)
<SEAGATE ST9300605SS 0004> at scbus1 target 1 lun 0 (da9,pass17)
<SEAGATE ST33000650SS 0004> at scbus8 target 9 lun 0 (da10,pass18)
<SGI CORP STORBRICK-3 1400> at scbus8 target 10 lun 0 (ses8,pass19)
<SEAGATE ST33000650SS 0004> at scbus8 target 11 lun 0 (da11,pass20)
<SGI CORP STORBRICK-1 1400> at scbus8 target 12 lun 0 (ses9,pass21)
<SEAGATE ST33000650SS 0004> at scbus8 target 13 lun 0 (da12,pass22)
<SGI CORP STORBRICK-2 1400> at scbus8 target 14 lun 0 (ses10,pass23)
<SEAGATE ST33000650SS 0004> at scbus8 target 15 lun 0 (da13,pass24)
<SGI CORP STORBRICK-4 1400> at scbus8 target 16 lun 0 (ses11,pass25)
<SEAGATE ST33000650SS 0004> at scbus8 target 17 lun 0 (da14,pass26)
<SGI CORP STORBRICK-6 1400> at scbus8 target 18 lun 0 (ses12,pass27)
<SEAGATE ST33000650SS 0004> at scbus8 target 19 lun 0 (da15,pass28)
<SGI CORP STORBRICK-0 1400> at scbus8 target 20 lun 0 (ses13,pass29)
<SEAGATE ST33000650SS 0004> at scbus8 target 21 lun 0 (da16,pass30)
<SGI CORP STORBRICK-7 1400> at scbus8 target 22 lun 0 (ses14,pass31)
<SEAGATE ST33000650SS 0004> at scbus8 target 23 lun 0 (da17,pass32)
<SGI CORP STORBRICK-5 1400> at scbus8 target 24 lun 0 (ses15,pass33)
nodeB drive list
camcontrol devlist
<SEAGATE ST33000650SS 0004> at scbus0 target 9 lun 0 (pass0,da0)
<STEC Z16IZF2E-200UCV E46F> at scbus0 target 10 lun 0 (pass1,da1)
<SGI CORP STORBRICK-3 1400> at scbus0 target 11 lun 0 (ses0,pass2)
<SEAGATE ST33000650SS 0004> at scbus0 target 12 lun 0 (pass3,da2)
<SGI CORP STORBRICK-4 1400> at scbus0 target 13 lun 0 (ses1,pass4)
<SEAGATE ST33000650SS 0004> at scbus0 target 14 lun 0 (pass5,da3)
<SGI CORP STORBRICK-5 1400> at scbus0 target 15 lun 0 (ses2,pass6)
<SEAGATE ST33000650SS 0004> at scbus0 target 16 lun 0 (pass7,da4)
<SGI CORP STORBRICK-7 1400> at scbus0 target 17 lun 0 (ses3,pass8)
<SEAGATE ST33000650SS 0004> at scbus0 target 18 lun 0 (pass9,da5)
<SGI CORP STORBRICK-6 1400> at scbus0 target 19 lun 0 (ses4,pass10)
<SEAGATE ST33000650SS 0004> at scbus0 target 20 lun 0 (pass11,da6)
<STEC Z16IZF2E-200UCV E46F> at scbus0 target 21 lun 0 (pass12,da7)
<SGI CORP STORBRICK-0 1400> at scbus0 target 22 lun 0 (ses5,pass13)
<SEAGATE ST33000650SS 0004> at scbus0 target 23 lun 0 (pass14,da8)
<SGI CORP STORBRICK-1 1400> at scbus0 target 25 lun 0 (ses6,pass15)
<SEAGATE ST33000650SS 0004> at scbus0 target 26 lun 0 (pass16,da9)
<SGI CORP STORBRICK-2 1400> at scbus0 target 28 lun 0 (ses7,pass17)
<SEAGATE ST9300605SS 0004> at scbus1 target 0 lun 0 (pass18,da10)
<SEAGATE ST9300605SS 0004> at scbus1 target 1 lun 0 (pass19,da11)
<SEAGATE ST33000650SS 0004> at scbus8 target 9 lun 0 (pass20,da12)
<SGI CORP STORBRICK-3 1400> at scbus8 target 10 lun 0 (ses8,pass21)
<SEAGATE ST33000650SS 0004> at scbus8 target 11 lun 0 (pass22,da13)
<SGI CORP STORBRICK-7 1400> at scbus8 target 12 lun 0 (ses9,pass23)
<SEAGATE ST33000650SS 0004> at scbus8 target 13 lun 0 (pass24,da14)
<SGI CORP STORBRICK-0 1400> at scbus8 target 14 lun 0 (ses10,pass25)
<SEAGATE ST33000650SS 0004> at scbus8 target 15 lun 0 (pass26,da15)
<SGI CORP STORBRICK-1 1400> at scbus8 target 16 lun 0 (ses11,pass27)
<SEAGATE ST33000650SS 0004> at scbus8 target 17 lun 0 (pass28,da16)
<SGI CORP STORBRICK-5 1400> at scbus8 target 18 lun 0 (ses12,pass29)
<SEAGATE ST33000650SS 0004> at scbus8 target 19 lun 0 (pass30,da17)
<SGI CORP STORBRICK-4 1400> at scbus8 target 20 lun 0 (ses13,pass31)
<SEAGATE ST33000650SS 0004> at scbus8 target 21 lun 0 (pass32,da18)
<SGI CORP STORBRICK-6 1400> at scbus8 target 22 lun 0 (ses14,pass33)
<SEAGATE ST33000650SS 0004> at scbus8 target 23 lun 0 (pass34,da19)
<SGI CORP STORBRICK-2 1400> at scbus8 target 24 lun 0 (ses15,pass35)
<USB 2.0 Flash Drive 8.07> at scbus10 target 0 lun 0 (da20,pass36)
the logic looks right, correct?
Devin
>
>
>
> then create the zpool from the "36" multipath devices?
>
> so if i create a 36 drive multipath zpool on nodeA when it fails do i
> just import it to nodeB
> i was thinking to use carp for failover..... so nodeB would continue nfs
> sessions and import the zpool to nodeB
>
>
>
>> --
>> Devin
>>
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>
>
> _____________
> The information contained in this message is proprietary and/or
> confidential. If you are not the intended recipient, please: (i) delete the
> message and all copies; (ii) do not disclose, distribute or use the message
> in any manner; and (iii) notify the sender immediately. In addition, please
> be aware that any message addressed to our domain is subject to archiving
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>
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