What does “no device” mean when running iostat -En

The name of the pictureThe name of the pictureThe name of the pictureClash Royale CLAN TAG#URR8PPP












1















We presume to have a faulty cable that connects the SAN to a direct I/O LDOM. This is a snippet of the error when running iostat -En



 c5t60060E8007C50E000030C50E00001067d0 Soft Errors: 0 Hard Errors: 696633 Transport Errors: 704386
Vendor: HITACHI Product: OPEN-V Revision: 8001 Serial No: 504463
Size: 214.75GB <214748364800 bytes>
Media Error: 0 Device Not Ready: 0 No Device: 6 Recoverable: 0
Illegal Request: 1 Predictive Failure Analysis: 0


What does No Device: 6 mean here?










share|improve this question






















  • What HBA/device driver are you using?

    – Andrew Henle
    Mar 5 at 23:07











  • HBA Port WWN: 21000024ff470f2e OS Device Name: /dev/cfg/c2 Manufacturer: QLogic Corp. Model: 371-4522-02 Firmware Version: 8.05.00 FCode/BIOS Version: BIOS: 2.10; fcode: 3.06; EFI: 2.04; Serial Number: 0402T00-1232085736 Driver Name: qlc Driver Version: 170516-5.06c Type: N-port State: online Supported Speeds: 2Gb 4Gb 8Gb Current Speed: 8Gb Node WWN: 20000024ff470f2e Link Error Statistics: Link Failure Count: 4386

    – hovey
    Mar 6 at 1:18















1















We presume to have a faulty cable that connects the SAN to a direct I/O LDOM. This is a snippet of the error when running iostat -En



 c5t60060E8007C50E000030C50E00001067d0 Soft Errors: 0 Hard Errors: 696633 Transport Errors: 704386
Vendor: HITACHI Product: OPEN-V Revision: 8001 Serial No: 504463
Size: 214.75GB <214748364800 bytes>
Media Error: 0 Device Not Ready: 0 No Device: 6 Recoverable: 0
Illegal Request: 1 Predictive Failure Analysis: 0


What does No Device: 6 mean here?










share|improve this question






















  • What HBA/device driver are you using?

    – Andrew Henle
    Mar 5 at 23:07











  • HBA Port WWN: 21000024ff470f2e OS Device Name: /dev/cfg/c2 Manufacturer: QLogic Corp. Model: 371-4522-02 Firmware Version: 8.05.00 FCode/BIOS Version: BIOS: 2.10; fcode: 3.06; EFI: 2.04; Serial Number: 0402T00-1232085736 Driver Name: qlc Driver Version: 170516-5.06c Type: N-port State: online Supported Speeds: 2Gb 4Gb 8Gb Current Speed: 8Gb Node WWN: 20000024ff470f2e Link Error Statistics: Link Failure Count: 4386

    – hovey
    Mar 6 at 1:18













1












1








1








We presume to have a faulty cable that connects the SAN to a direct I/O LDOM. This is a snippet of the error when running iostat -En



 c5t60060E8007C50E000030C50E00001067d0 Soft Errors: 0 Hard Errors: 696633 Transport Errors: 704386
Vendor: HITACHI Product: OPEN-V Revision: 8001 Serial No: 504463
Size: 214.75GB <214748364800 bytes>
Media Error: 0 Device Not Ready: 0 No Device: 6 Recoverable: 0
Illegal Request: 1 Predictive Failure Analysis: 0


What does No Device: 6 mean here?










share|improve this question














We presume to have a faulty cable that connects the SAN to a direct I/O LDOM. This is a snippet of the error when running iostat -En



 c5t60060E8007C50E000030C50E00001067d0 Soft Errors: 0 Hard Errors: 696633 Transport Errors: 704386
Vendor: HITACHI Product: OPEN-V Revision: 8001 Serial No: 504463
Size: 214.75GB <214748364800 bytes>
Media Error: 0 Device Not Ready: 0 No Device: 6 Recoverable: 0
Illegal Request: 1 Predictive Failure Analysis: 0


What does No Device: 6 mean here?







solaris disk iostat san






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked Mar 5 at 22:01









hoveyhovey

82




82












  • What HBA/device driver are you using?

    – Andrew Henle
    Mar 5 at 23:07











  • HBA Port WWN: 21000024ff470f2e OS Device Name: /dev/cfg/c2 Manufacturer: QLogic Corp. Model: 371-4522-02 Firmware Version: 8.05.00 FCode/BIOS Version: BIOS: 2.10; fcode: 3.06; EFI: 2.04; Serial Number: 0402T00-1232085736 Driver Name: qlc Driver Version: 170516-5.06c Type: N-port State: online Supported Speeds: 2Gb 4Gb 8Gb Current Speed: 8Gb Node WWN: 20000024ff470f2e Link Error Statistics: Link Failure Count: 4386

    – hovey
    Mar 6 at 1:18

















  • What HBA/device driver are you using?

    – Andrew Henle
    Mar 5 at 23:07











  • HBA Port WWN: 21000024ff470f2e OS Device Name: /dev/cfg/c2 Manufacturer: QLogic Corp. Model: 371-4522-02 Firmware Version: 8.05.00 FCode/BIOS Version: BIOS: 2.10; fcode: 3.06; EFI: 2.04; Serial Number: 0402T00-1232085736 Driver Name: qlc Driver Version: 170516-5.06c Type: N-port State: online Supported Speeds: 2Gb 4Gb 8Gb Current Speed: 8Gb Node WWN: 20000024ff470f2e Link Error Statistics: Link Failure Count: 4386

    – hovey
    Mar 6 at 1:18
















What HBA/device driver are you using?

– Andrew Henle
Mar 5 at 23:07





What HBA/device driver are you using?

– Andrew Henle
Mar 5 at 23:07













HBA Port WWN: 21000024ff470f2e OS Device Name: /dev/cfg/c2 Manufacturer: QLogic Corp. Model: 371-4522-02 Firmware Version: 8.05.00 FCode/BIOS Version: BIOS: 2.10; fcode: 3.06; EFI: 2.04; Serial Number: 0402T00-1232085736 Driver Name: qlc Driver Version: 170516-5.06c Type: N-port State: online Supported Speeds: 2Gb 4Gb 8Gb Current Speed: 8Gb Node WWN: 20000024ff470f2e Link Error Statistics: Link Failure Count: 4386

– hovey
Mar 6 at 1:18





HBA Port WWN: 21000024ff470f2e OS Device Name: /dev/cfg/c2 Manufacturer: QLogic Corp. Model: 371-4522-02 Firmware Version: 8.05.00 FCode/BIOS Version: BIOS: 2.10; fcode: 3.06; EFI: 2.04; Serial Number: 0402T00-1232085736 Driver Name: qlc Driver Version: 170516-5.06c Type: N-port State: online Supported Speeds: 2Gb 4Gb 8Gb Current Speed: 8Gb Node WWN: 20000024ff470f2e Link Error Statistics: Link Failure Count: 4386

– hovey
Mar 6 at 1:18










1 Answer
1






active

oldest

votes


















0














A search through the Illumos fiber-channel device code for ENODEV shows 13 uses of ENODEV in the source code that originated as OpenSolaris.



Of those instances, I suspect this is the one most likely to cause your "No device" errors:



pd = fctl_hold_remote_port_by_pwwn(port, &pwwn);
if (pd == NULL)
fcio->fcio_errno = FC_BADDEV;
return (ENODEV);



That code is in the fp_fcio_login() function, where the code appears to be trying to login to a remote WWN. It seems appropriate to assume a bad cable could prevent that from happening. Note that fiber-channel error code is FC_BADDEV, which also seems appropriate for a bad cable.



In short, a review of the source code indicates that ENODEV errors are consistent a bad cable.



You can use dTrace to more closely identify the association if necessary. Given that both hard and transport errors occur about 5 or 6 orders of magnitude more frequently, IMO that effort isn't necessary until the ENODEV errors occur after the other errors are addressed and no longer occur.






share|improve this answer























  • Thanks. So is 'No Device' a counter of sorts?

    – hovey
    Mar 6 at 20:30











  • In this case, the number you are seeing is a count of the number of times that error code was returned when something didn't work. But if you look at your total number of errors, you have 6 "No device" errors likely generated when your system had trouble connecting to a remote disk controller/LUN compared to 1.4 million hard and transfer errors.

    – Andrew Henle
    Mar 8 at 13:42











Your Answer








StackExchange.ready(function()
var channelOptions =
tags: "".split(" "),
id: "106"
;
initTagRenderer("".split(" "), "".split(" "), channelOptions);

StackExchange.using("externalEditor", function()
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled)
StackExchange.using("snippets", function()
createEditor();
);

else
createEditor();

);

function createEditor()
StackExchange.prepareEditor(
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: false,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: null,
bindNavPrevention: true,
postfix: "",
imageUploader:
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
,
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
);



);













draft saved

draft discarded


















StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2funix.stackexchange.com%2fquestions%2f504585%2fwhat-does-no-device-mean-when-running-iostat-en%23new-answer', 'question_page');

);

Post as a guest















Required, but never shown

























1 Answer
1






active

oldest

votes








1 Answer
1






active

oldest

votes









active

oldest

votes






active

oldest

votes









0














A search through the Illumos fiber-channel device code for ENODEV shows 13 uses of ENODEV in the source code that originated as OpenSolaris.



Of those instances, I suspect this is the one most likely to cause your "No device" errors:



pd = fctl_hold_remote_port_by_pwwn(port, &pwwn);
if (pd == NULL)
fcio->fcio_errno = FC_BADDEV;
return (ENODEV);



That code is in the fp_fcio_login() function, where the code appears to be trying to login to a remote WWN. It seems appropriate to assume a bad cable could prevent that from happening. Note that fiber-channel error code is FC_BADDEV, which also seems appropriate for a bad cable.



In short, a review of the source code indicates that ENODEV errors are consistent a bad cable.



You can use dTrace to more closely identify the association if necessary. Given that both hard and transport errors occur about 5 or 6 orders of magnitude more frequently, IMO that effort isn't necessary until the ENODEV errors occur after the other errors are addressed and no longer occur.






share|improve this answer























  • Thanks. So is 'No Device' a counter of sorts?

    – hovey
    Mar 6 at 20:30











  • In this case, the number you are seeing is a count of the number of times that error code was returned when something didn't work. But if you look at your total number of errors, you have 6 "No device" errors likely generated when your system had trouble connecting to a remote disk controller/LUN compared to 1.4 million hard and transfer errors.

    – Andrew Henle
    Mar 8 at 13:42















0














A search through the Illumos fiber-channel device code for ENODEV shows 13 uses of ENODEV in the source code that originated as OpenSolaris.



Of those instances, I suspect this is the one most likely to cause your "No device" errors:



pd = fctl_hold_remote_port_by_pwwn(port, &pwwn);
if (pd == NULL)
fcio->fcio_errno = FC_BADDEV;
return (ENODEV);



That code is in the fp_fcio_login() function, where the code appears to be trying to login to a remote WWN. It seems appropriate to assume a bad cable could prevent that from happening. Note that fiber-channel error code is FC_BADDEV, which also seems appropriate for a bad cable.



In short, a review of the source code indicates that ENODEV errors are consistent a bad cable.



You can use dTrace to more closely identify the association if necessary. Given that both hard and transport errors occur about 5 or 6 orders of magnitude more frequently, IMO that effort isn't necessary until the ENODEV errors occur after the other errors are addressed and no longer occur.






share|improve this answer























  • Thanks. So is 'No Device' a counter of sorts?

    – hovey
    Mar 6 at 20:30











  • In this case, the number you are seeing is a count of the number of times that error code was returned when something didn't work. But if you look at your total number of errors, you have 6 "No device" errors likely generated when your system had trouble connecting to a remote disk controller/LUN compared to 1.4 million hard and transfer errors.

    – Andrew Henle
    Mar 8 at 13:42













0












0








0







A search through the Illumos fiber-channel device code for ENODEV shows 13 uses of ENODEV in the source code that originated as OpenSolaris.



Of those instances, I suspect this is the one most likely to cause your "No device" errors:



pd = fctl_hold_remote_port_by_pwwn(port, &pwwn);
if (pd == NULL)
fcio->fcio_errno = FC_BADDEV;
return (ENODEV);



That code is in the fp_fcio_login() function, where the code appears to be trying to login to a remote WWN. It seems appropriate to assume a bad cable could prevent that from happening. Note that fiber-channel error code is FC_BADDEV, which also seems appropriate for a bad cable.



In short, a review of the source code indicates that ENODEV errors are consistent a bad cable.



You can use dTrace to more closely identify the association if necessary. Given that both hard and transport errors occur about 5 or 6 orders of magnitude more frequently, IMO that effort isn't necessary until the ENODEV errors occur after the other errors are addressed and no longer occur.






share|improve this answer













A search through the Illumos fiber-channel device code for ENODEV shows 13 uses of ENODEV in the source code that originated as OpenSolaris.



Of those instances, I suspect this is the one most likely to cause your "No device" errors:



pd = fctl_hold_remote_port_by_pwwn(port, &pwwn);
if (pd == NULL)
fcio->fcio_errno = FC_BADDEV;
return (ENODEV);



That code is in the fp_fcio_login() function, where the code appears to be trying to login to a remote WWN. It seems appropriate to assume a bad cable could prevent that from happening. Note that fiber-channel error code is FC_BADDEV, which also seems appropriate for a bad cable.



In short, a review of the source code indicates that ENODEV errors are consistent a bad cable.



You can use dTrace to more closely identify the association if necessary. Given that both hard and transport errors occur about 5 or 6 orders of magnitude more frequently, IMO that effort isn't necessary until the ENODEV errors occur after the other errors are addressed and no longer occur.







share|improve this answer












share|improve this answer



share|improve this answer










answered Mar 6 at 11:27









Andrew HenleAndrew Henle

2,787911




2,787911












  • Thanks. So is 'No Device' a counter of sorts?

    – hovey
    Mar 6 at 20:30











  • In this case, the number you are seeing is a count of the number of times that error code was returned when something didn't work. But if you look at your total number of errors, you have 6 "No device" errors likely generated when your system had trouble connecting to a remote disk controller/LUN compared to 1.4 million hard and transfer errors.

    – Andrew Henle
    Mar 8 at 13:42

















  • Thanks. So is 'No Device' a counter of sorts?

    – hovey
    Mar 6 at 20:30











  • In this case, the number you are seeing is a count of the number of times that error code was returned when something didn't work. But if you look at your total number of errors, you have 6 "No device" errors likely generated when your system had trouble connecting to a remote disk controller/LUN compared to 1.4 million hard and transfer errors.

    – Andrew Henle
    Mar 8 at 13:42
















Thanks. So is 'No Device' a counter of sorts?

– hovey
Mar 6 at 20:30





Thanks. So is 'No Device' a counter of sorts?

– hovey
Mar 6 at 20:30













In this case, the number you are seeing is a count of the number of times that error code was returned when something didn't work. But if you look at your total number of errors, you have 6 "No device" errors likely generated when your system had trouble connecting to a remote disk controller/LUN compared to 1.4 million hard and transfer errors.

– Andrew Henle
Mar 8 at 13:42





In this case, the number you are seeing is a count of the number of times that error code was returned when something didn't work. But if you look at your total number of errors, you have 6 "No device" errors likely generated when your system had trouble connecting to a remote disk controller/LUN compared to 1.4 million hard and transfer errors.

– Andrew Henle
Mar 8 at 13:42

















draft saved

draft discarded
















































Thanks for contributing an answer to Unix & Linux Stack Exchange!


  • Please be sure to answer the question. Provide details and share your research!

But avoid


  • Asking for help, clarification, or responding to other answers.

  • Making statements based on opinion; back them up with references or personal experience.

To learn more, see our tips on writing great answers.




draft saved


draft discarded














StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2funix.stackexchange.com%2fquestions%2f504585%2fwhat-does-no-device-mean-when-running-iostat-en%23new-answer', 'question_page');

);

Post as a guest















Required, but never shown





















































Required, but never shown














Required, but never shown












Required, but never shown







Required, but never shown

































Required, but never shown














Required, but never shown












Required, but never shown







Required, but never shown






Popular posts from this blog

How to check contact read email or not when send email to Individual?

Displaying single band from multi-band raster using QGIS

How many registers does an x86_64 CPU actually have?