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Error while backing up mulitpath devices using CDP
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jeet2k123  
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 More options Jun 25, 7:06 am
From: jeet2k123 <jeet2k...@gmail.com>
Date: Thu, 25 Jun 2009 04:06:45 -0700 (PDT)
Local: Thurs, Jun 25 2009 7:06 am
Subject: Error while backing up mulitpath devices using CDP
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Hi all,

We using R1soft CDP tool to backup Linux files. on  centos 5.2

The Backup works fine for normal disk, but for multipath devices its
giving error while taking backup

I am using 11 iSCSI partition on a SAN device configured in multipath.
I am using 8 path in multipath.
My multipath is using 2 Intel NIC which are connected to dedicated
managed switch(HP)

I have configured multipath as per this doc.
http://wiki.r1soft.com/display/kb/Linux+Agent+Multipath+Workaround

my mount point is
/dev/dm-0 on /home11 type ext3 (rw)

The moment i start backup for above mount point, i get this error
{code}
Jun 23 12:21:24 mss-us2 kernel: connection8:0: ping timeout of 5 secs
expired, last rx 7739207452, last ping 7739212452, now 7739217452
Jun 23 12:21:24 mss-us2 kernel: connection8:0: detected conn error
(1011)
Jun 23 12:21:24 mss-us2 kernel: sd 10:0:0:11: SCSI error: return code
= 0x00020000
Jun 23 12:21:24 mss-us2 kernel: end_request: I/O error, dev sdi,
sector 2362696
Jun 23 12:21:24 mss-us2 kernel: device-mapper: multipath: Failing path
8:128.
Jun 23 12:21:24 mss-us2 multipathd: sdab: tur checker reports path is
down
Jun 23 12:21:24 mss-us2 multipathd: checker failed path 65:176 in map
home13
Jun 23 12:21:24 mss-us2 kernel: device-mapper: multipath: Failing path
65:176.
Jun 23 12:21:24 mss-us2 multipathd: home13: remaining active paths: 7
Jun 23 12:21:25 mss-us2 iscsid: Kernel reported iSCSI connection 8:0
error (1011) state (3)
Jun 23 12:21:28 mss-us2 iscsid: connection8:0 is operational after
recovery (1 attempts)
Jun 23 12:22:00 mss-us2 kernel: connection2:0: ping timeout of 5 secs
expired, last rx 7739243726, last ping 7739248726, now 7739253726
Jun 23 12:22:00 mss-us2 kernel: connection2:0: detected conn error
(1011)
Jun 23 12:22:00 mss-us2 kernel: sd 4:0:0:11: SCSI error: return code =
0x00020000
Jun 23 12:22:00 mss-us2 kernel: end_request: I/O error, dev sdg,
sector 3146136
Jun 23 12:22:00 mss-us2 kernel: device-mapper: multipath: Failing path
8:96.
Jun 23 12:22:00 mss-us2 kernel: device-mapper: multipath: Failing path
8:208.
Jun 23 12:22:00 mss-us2 multipathd: sdn: tur checker reports path is
down
Jun 23 12:22:00 mss-us2 multipathd: checker failed path 8:208 in map
home12
Jun 23 12:22:00 mss-us2 multipathd: home12: remaining active paths: 7
Jun 23 12:22:01 mss-us2 iscsid: Kernel reported iSCSI connection 2:0
error (1011) state (3)
Jun 23 12:22:04 mss-us2 iscsid: connection2:0 is operational after
recovery (1 attempts)
Jun 23 12:22:08 mss-us2 multipathd: dm-0: add map (uevent)
Jun 23 12:22:08 mss-us2 multipathd: dm-0: devmap already registered
Jun 23 12:22:08 mss-us2 multipathd: 8:96: mark as failed
Jun 23 12:22:08 mss-us2 multipathd: home11: remaining active paths: 7
Jun 23 12:22:08 mss-us2 multipathd: 8:128: mark as failed
Jun 23 12:22:08 mss-us2 multipathd: home11: remaining active paths: 6
Jun 23 12:22:08 mss-us2 multipathd: dm-4: add map (uevent)
Jun 23 12:22:08 mss-us2 multipathd: dm-4: devmap already registered
Jun 23 12:22:08 mss-us2 multipathd: dm-0: add map (uevent)
Jun 23 12:22:08 mss-us2 multipathd: dm-0: devmap already registered
Jun 23 12:22:08 mss-us2 multipathd: dm-1: add map (uevent)
Jun 23 12:22:08 mss-us2 multipathd: dm-1: devmap already registered
Jun 23 12:22:13 mss-us2 multipathd: sdab: tur checker reports path is
up
Jun 23 12:22:13 mss-us2 multipathd: 65:176: reinstated
Jun 23 12:22:13 mss-us2 multipathd: home13: remaining active paths: 8
Jun 23 12:22:14 mss-us2 multipathd: sdg: tur checker reports path is
up
Jun 23 12:22:14 mss-us2 multipathd: 8:96: reinstated
Jun 23 12:22:14 mss-us2 multipathd: home11: remaining active paths: 7
Jun 23 12:22:14 mss-us2 multipathd: sdi: tur checker reports path is
up
Jun 23 12:22:14 mss-us2 multipathd: 8:128: reinstated
Jun 23 12:22:14 mss-us2 multipathd: home11: remaining active paths: 8
Jun 23 12:22:15 mss-us2 multipathd: sdn: tur checker reports path is
up
Jun 23 12:22:15 mss-us2 multipathd: 8:208: reinstated
{code}

R1Soft Support  guys says there could be problems with the iscsi
device. It's possible that CDP agent may be overwhelming it with too
many requests.  If that's the case, it may be resolved with a
configuration change to the iscsi driver.

Any suggestions/tips on what i might be doing wrong ?

Regards
Jeetendra


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Mike Christie  
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 More options Jun 25, 11:07 am
From: Mike Christie <micha...@cs.wisc.edu>
Date: Thu, 25 Jun 2009 10:07:53 -0500
Local: Thurs, Jun 25 2009 11:07 am
Subject: Re: Error while backing up mulitpath devices using CDP
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On 06/25/2009 06:06 AM, jeet2k123 wrote:

What kernel are you using?

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jeet2k123  
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 More options Jun 25, 12:05 pm
From: jeet2k123 <jeet2k...@gmail.com>
Date: Thu, 25 Jun 2009 09:05:07 -0700 (PDT)
Local: Thurs, Jun 25 2009 12:05 pm
Subject: Re: Error while backing up mulitpath devices using CDP
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2.6.18-128.1.6.el5

On Jun 25, 8:07 pm, Mike Christie <micha...@cs.wisc.edu> wrote:


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dushy  
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 More options Jun 29, 3:31 am
From: dushy <dushya...@gmail.com>
Date: Mon, 29 Jun 2009 00:31:43 -0700 (PDT)
Local: Mon, Jun 29 2009 3:31 am
Subject: Re: Error while backing up mulitpath devices using CDP
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What about your config file and portal settings ?

On Jun 25, 9:05 pm, jeet2k123 <jeet2k...@gmail.com> wrote:


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jeet2k123  
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 More options Jun 29, 7:25 am
From: jeet2k123 <jeet2k...@gmail.com>
Date: Mon, 29 Jun 2009 04:25:31 -0700 (PDT)
Local: Mon, Jun 29 2009 7:25 am
Subject: Re: Error while backing up mulitpath devices using CDP
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My  iscsid.conf is
#######################
node.startup = manual
node.session.timeo.replacement_timeout = 5
node.conn[0].timeo.login_timeout = 15
node.conn[0].timeo.logout_timeout = 15
node.conn[0].timeo.noop_out_interval = 5
node.conn[0].timeo.noop_out_timeout = 5
node.session.err_timeo.abort_timeout = 15
node.session.err_timeo.lu_reset_timeout = 20
node.session.initial_login_retry_max = 8
node.session.cmds_max = 128
node.session.queue_depth = 32
node.session.iscsi.InitialR2T = No
node.session.iscsi.ImmediateData = Yes
node.session.iscsi.FirstBurstLength = 262144
node.session.iscsi.MaxBurstLength = 16776192
node.conn[0].iscsi.MaxRecvDataSegmentLength = 131072
discovery.sendtargets.iscsi.MaxRecvDataSegmentLength = 32768
node.session.iscsi.FastAbort = Yes
######################

My portal setting is
######################
172.16.1.200:3260,1 iqn.2002-10.com.san:raid.sn7617293.001
172.16.1.201:3260,1 iqn.2002-10.com.san:raid.sn7617293.101
172.16.1.221:3260,1 iqn.2002-10.com.san:raid.sn7617247.112
172.16.1.220:3260,1 iqn.2002-10.com.san:raid.sn7617247.012
172.16.2.200:3260,1 iqn.2002-10.com.san:raid.sn7617293.201
172.16.2.220:3260,1 iqn.2002-10.com.san:raid.sn7617247.212
172.16.2.221:3260,1 iqn.2002-10.com.san:raid.sn7617247.312
172.16.2.201:3260,1 iqn.2002-10.com.san:raid.sn7617293.301
######################

On Jun 29, 12:31 pm, dushy <dushya...@gmail.com> wrote:


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Mike Christie  
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 More options Jun 30, 11:10 pm
From: Mike Christie <micha...@cs.wisc.edu>
Date: Tue, 30 Jun 2009 22:10:53 -0500
Local: Tues, Jun 30 2009 11:10 pm
Subject: Re: Error while backing up mulitpath devices using CDP
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On 06/29/2009 06:25 AM, jeet2k123 wrote:

> node.conn[0].timeo.noop_out_interval = 5
> node.conn[0].timeo.noop_out_timeout = 5

If you set these to zero or set them higher does it help. You have to
rerun the discovery command so the new iscsid.conf values are picked up
or if you have the tools from cenots 5.3 then you can just run
iscsiadm -m node -o update -n node.conn[0].timeo.noop_out_interval -v 0
iscsiadm -m node -o update -n node.conn[0].timeo.noop_out_timeout -v 0

Or set this to
iscsiadm -m node -o update -n node.conn[0].timeo.noop_out_interval -v 25
iscsiadm -m node -o update -n node.conn[0].timeo.noop_out_timeout -v 25


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jeet2k123  
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 More options Jul 16, 12:26 pm
From: jeet2k123 <jeet2k...@gmail.com>
Date: Thu, 16 Jul 2009 09:26:56 -0700 (PDT)
Local: Thurs, Jul 16 2009 12:26 pm
Subject: Re: Error while backing up mulitpath devices using CDP
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On Jul 1, 8:10 am, Mike Christie <micha...@cs.wisc.edu> wrote:

> On 06/29/2009 06:25 AM, jeet2k123 wrote:

> > node.conn[0].timeo.noop_out_interval = 5
> > node.conn[0].timeo.noop_out_timeout = 5

> If you set these to zero or set them higher does it help. You have to
> rerun the discovery command so the new iscsid.conf values are picked up
> or if you have the tools from cenots 5.3 then you can just run
> iscsiadm -m node -o update -n node.conn[0].timeo.noop_out_interval -v 0
> iscsiadm -m node -o update -n node.conn[0].timeo.noop_out_timeout -v 0

> Or set this to
> iscsiadm -m node -o update -n node.conn[0].timeo.noop_out_interval -v 25
> iscsiadm -m node -o update -n node.conn[0].timeo.noop_out_timeout -v 25

i tried both the options, still im getting that same error :(

Regards
Jeetendra


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Mike Christie  
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 More options Jul 16, 1:59 pm
From: Mike Christie <micha...@cs.wisc.edu>
Date: Thu, 16 Jul 2009 12:59:36 -0500
Local: Thurs, Jul 16 2009 1:59 pm
Subject: Re: Error while backing up mulitpath devices using CDP
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On 07/16/2009 11:26 AM, jeet2k123 wrote:

If you set the values to 0 you should not get the ping timeout error
message. When you use that value do you see:

Jun 23 12:21:24 mss-us2 kernel: connection8:0: ping timeout of 5 secs
expired, last rx 7739207452, last ping 7739212452, now 7739217452

If you do then run

iscsidm -m node -T your_tagret -p your_portal | grep noop

and make sure those values are 0.


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jeet2k123  
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 More options Jul 20, 5:51 am
From: jeet2k123 <jeet2k...@gmail.com>
Date: Mon, 20 Jul 2009 02:51:58 -0700 (PDT)
Local: Mon, Jul 20 2009 5:51 am
Subject: Re: Error while backing up mulitpath devices using CDP
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> If you set the values to 0 you should not get the ping timeout error
> message. When you use that value do you see:

> Jun 23 12:21:24 mss-us2 kernel: connection8:0: ping timeout of 5 secs
> expired, last rx 7739207452, last ping 7739212452, now 7739217452

> If you do then run

> iscsidm -m node -T your_tagret -p your_portal | grep noop

> and make sure those values are 0.

Hi Mike,

Thanks for your help.
node.conn[0].timeo.noop_out_* value to 0 made the backup worked

-Jeetendra


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dushy  
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 More options Aug 10, 8:45 am
From: dushy <dushya...@gmail.com>
Date: Mon, 10 Aug 2009 05:45:34 -0700 (PDT)
Local: Mon, Aug 10 2009 8:45 am
Subject: Re: Error while backing up mulitpath devices using CDP
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On Jul 20, 2:51 pm, jeet2k123 <jeet2k...@gmail.com> wrote:

Wouldn't this cause issues with path failover's - cos multipath is
beiung used here ? Iam guessing setting the noop_timeout to 0 will
never fail the path.

Dushyanth


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jeet2k123  
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 More options Aug 12, 11:41 am
From: jeet2k123 <jeet2k...@gmail.com>
Date: Wed, 12 Aug 2009 08:41:41 -0700 (PDT)
Local: Wed, Aug 12 2009 11:41 am
Subject: Re: Error while backing up mulitpath devices using CDP
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> Wouldn't this cause issues with path failover's - cos multipath is
> beiung used here ? Iam guessing setting the noop_timeout to 0 will
> never fail the path.

setting  node.conn[0].timeo.noop_out_interval and node.conn
[0].timeo.noop_out_timeout to 25 also works fine

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