PowerVault MD3800i: another v. disk not on preferred path

 

Hi:

 

Any way to get complementary info about it ? 

root@castor:~# bash SMcli -n medusa -c 'save storageArray  allEvents file="/tmp/kk";
...

 Date/Time: 11/27/18 11:01:02 AM

Hello Goyo,

What you need to look at in MDSM is how many virtual disks that you have, and how many are assigned to each controller.  You want to have it balanced between the controllers.  Also, if you know you have some virtual disk that are accessed more than others, & are on the same controller, then you will want to separate them & change the controller that owns the virtual disk to the other controller.   

 

In most cases you will not see any error on your switch.  When the VD fails over the alternate controller it is due to one controller having high I/O & the alt controller having lower I/O.

 

What is the current version of firmware that is on your MD3800i?

Please let us know if you have any other questions.

 

Hello:

I have defined 3 virtual disk, and I found one stable combination of RAID controller  assignments  (no change between the two controllers), any other combination fails (that is, there are some disk change from one controller to another)

SMcli -n medusa -c 'show allVirtualDisks;'
...

STANDARD VIRTUAL DISKS------------------------------

SUMMARY

Number of standard virtual disks: 3

See other Virtual Disks sub-tabs for premium feature information.

Name        Thin Provisioned Status Capacity Accessible by Source
imagenes  No                         Optimal 10.905 TB Host Group geminis Disk Group imagenes
it                  No                         Optimal 5,120.003 GB Host Group geminis Disk Group cuentas
lab              No                          Optimal 11.357 TB Host Group geminis Disk Group cuentas

...

 

Virtual Disk name: imagenes
...
Preferred owner: RAID Controller Module in slot 1
Current owner: RAID Controller Module in slot 1

...

Virtual Disk name: it
...

Preferred owner: RAID Controller Module in slot 0
Current owner: RAID Controller Module in slot 0

...

Virtual Disk name: lab
...
Preferred owner: RAID Controller Module in slot 1
Current owner: RAID Controller Module in slot 1

 

On this stable state, I get the following iSCSI statistics:

 

SMcli -n medusa -c 'save storageArray iscsiStatistics [baseline] file="/tmp/iscsi_011.txt";'

less /tmp/iscsi_011.txt

...

"MAC transmit statistics"

"iSCSI Host Port","F","B","MF","BF","PF","CF","FDF","FED","FLC","FA","FSC","FMC","FC","FDR","JF"

"1 (RAID Controller Module 0)","70391","41792276","234","0","0","0","0","0","0","0","0","0","0","0","6147"
"1 (RAID Controller Module 1)","63182","40875806","234","0","0","0","0","0","0","0","0","0","0","0","6069"
"0 (RAID Controller Module 0)","6159","13553796","234","0","0","0","0","0","0","0","0","0","0","0","3132"
"0 (RAID Controller Module 1)","1775167","140668996","234","0","0","0","0","0","0","0","0","0","0","0","3515"
"MAC receive statistics"

"iSCSI Host Port","F","B","MF","BF","PF","CF","FLE","FD","FCRCE","FEE","LFE","SFE","J","UCC","CSE"

"1 (RAID Controller Module 0)","196574","470747665","53882","0","0","0","0","0","0","0","0","0","0","0","0"
"1 (RAID Controller Module 1)","157119","334573312","53882","0","0","0","0","0","0","0","0","0","0","0","0"
"0 (RAID Controller Module 0)","65730","19403898","53881","0","0","0","0","0","0","0","0","0","0","0","0"
"0 (RAID Controller Module 1)","556344","4312588438","53882","0","0","0","0","0","0","0","0","0","0","0","0"

...

"TCP statistics"

"iSCSI Host Port","TxS","TxB","RTxTE","TxDACK","TxACK","RxS","RxB","RxDACK","RxACK","RxSEC","RxSOOC","RxWP","RxWU"

"RAID Controller Module 1, port 0","70157","36855312","0","3","0","324454","440727520","0","0","188","1506","0","141603"
"RAID Controller Module 1, port 1","62948","36443472","0","19","0","199509","302841856","0","0","612","12102","0","98053"
"RAID Controller Module 0, port 0","5925","13113072","0","0","0","5925","284400","0","0","0","0","0","11849"
"RAID Controller Module 0, port 1","1774933","16397712","0","15","0","100313","4163526704","8","0","3535","1461113","0","109600"
"IPv4 statistics"

"iSCSI Host Port","TxP","TxB","TxF","RxP","RxB","RxF","RxPE","DR","DRE-OLFC","DRE-OOFC","DRE-TOC"

"RAID Controller Module 1, port 0","70157","39100336","0","324454","447216600","0","0","0","0","0","0"
"RAID Controller Module 1, port 1","62948","38457808","0","199509","306832036","0","0","0","0","0","0"
"RAID Controller Module 0, port 0","5925","13302672","0","5925","402900","0","0","0","0","0","0"
"RAID Controller Module 0, port 1","1774933","73195568","0","100313","4165532964","0","0","0","0","0","0"
"IPv6 statistics"

"iSCSI Host Port","TxP","TxB","TxF","RxP","RxB","RxF","RxPE","DR","DRE-OLFC","DRE-OOFC","DRE-TOC"

"RAID Controller Module 1, port 0","0","0","0","0","0","0","0","0","0","0","0"
"RAID Controller Module 1, port 1","0","0","0","0","0","0","0","0","0","0","0"
"RAID Controller Module 0, port 0","0","0","0","0","0","0","0","0","0","0","0"
"RAID Controller Module 0, port 1","0","0","0","0","0","0","0","0","0","0","0"

 

The records show some error on TCP, but there are no change of controller.

"RxSEC = Received Segment Error Count"
"RxSOOC = Received Segment Out of Order Count"

 

Any other combination of disks and controllers assignments and in a few minutes some virtual disc change from one controller to other.

 

Ex.:

Virtual Disk name: imagenes
...

Preferred owner: RAID Controller Module in slot 0
Current owner: RAID Controller Module in slot 1

Virtual Disk name: it
...
Preferred owner: RAID Controller Module in slot 1
Current owner: RAID Controller Module in slot 1

...

Virtual Disk name: lab
...
Preferred owner: RAID Controller Module in slot 0
Current owner: RAID Controller Module in slot 0

 

Our firmware is : 

bash SMcli -n medusa -c 'show storageArray ;'

...

FIRMWARE INVENTORY
MD Storage Manager®
AMW Version: 11.25.0G06.0026
Report Date: Wed Dec 05 15:33:46 CET 2018

Storage Array
Storage Array Name: medusa
Current Package Version: 08.25.08.60
Current NVSRAM Version: N2701-825890-003
Staged Package Version: None
Staged NVSRAM Version: None

RAID Controller Modules
Location: Enclosure 0, Slot 0
Current Package Version: 08.25.08.60
Current NVSRAM Version: N2701-825890-003
Board ID: 2701
Sub-Model ID: 219

Location: Enclosure 0, Slot 1
Current Package Version: 08.25.08.60
Current NVSRAM Version: N2701-825890-003
Board ID: 2701
Sub-Model ID: 219

...

 

Thanks 

Goyo.

 

 Hellow: 

 

I have 3 virtual disk, I have found a stable combination of assignment between discs and controllers, (that is, no change from one controller to another)

Any other combination of disks and controllers assignments and in a few minutes some virtual disc change from one controller to other. 

Our firmware:

FIRMWARE INVENTORY
MD Storage Manager®
AMW Version: 11.25.0G06.0026
Report Date: Wed Dec 05 16:31:30 CET 2018

Storage Array
Storage Array Name: medusa
Current Package Version: 08.25.08.60
Current NVSRAM Version: N2701-825890-003
Staged Package Version: None
Staged NVSRAM Version: None

RAID Controller Modules
Location: Enclosure 0, Slot 0
Current Package Version: 08.25.08.60
Current NVSRAM Version: N2701-825890-003
Board ID: 2701
Sub-Model ID: 219

 

Thanks

Goyo

Hello Goyo,

Good to hear that that you were able to resolve your issue with your virtual disk changing controllers.  Your firmware version is a little old and should be upgraded when you can.  Here is the link to the latest firmware just in case you need it. https://www.dell.com/support/home/us/en/04/drivers/driversdetails?driverId=NC41W&osCode=W12R2&productCode=powervault-md3800i

Please let us know if you have any other questions.

Hi i have upgrade the firmware and seems going better RAID Controller Module in Enclosure 0, Slot 0 Status: Online Current configuration Firmware version: 08.25.14.60 Appware version: 08.25.14.60 Bootware version: 08.25.14.60 NVSRAM version: N2701-825890-004

Hello gctorres,

Glad that since you have upgraded your firmware that you have not been getting the alert messages.

Please let us know if you have any other questions.