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benma
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SCSI Error 24/0 0x0 0x0 0x0

Hey folks,

I'm getting a lot of 24/0 0x0 0x0 0x0 errors on many LUNs.

I know that this is a SCSI reservation error. On my LUNs are about 10 VMs.

Unfortunately I'm also getting this on a LUN with only 1 VM Smiley Wink

In my env. I'm using iSCSI through QLogic HBAs and NetApp Storage.

dmesg does not report any conflicts.

esxcfg-info reports that there aren't any Pending Reservations.

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benma
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If I add a higher value to adv. options scsiconflictretries

there are less errors but thats not the solution.

UPDATE: With a value of 100 are about 5-10% less errors

Any thoughts?

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depping
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do you have any messages in vmkwarning ? I've seen this happen at other sites as well. Contacted support about it and they asured me i didn't need to be worried if there were no messages in vmkwarning.

Duncan

VMware Communities User Moderator

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benma
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Hey Duncan,

I'm very thankful for your reply. I don't think there are any messages in vmkwarning.

But I'll check this on monday. There aren't any "problems" in my environment. Everything works fine.

Unfortunantly this message is spamming my syslog server every 1-2min and the database behind is growing.

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benma
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I've checked vmkwarning.

I receive

WARNING: SCSI: 5344: vml.02000d000060a98000486e2f4f475a4e705756386f4c554e202020: Too many failed retries 33 (32), Returning I/O failure. 0x12 1/0x0 0x0 0x0 0x0

and

WARNING: SCSI: 5344: vml.02000c000060a98000486e2f4f475a4e7057586b324c554e202020:

Too many failed retries 33 (32), Returning I/O failure. 0x25 1/0x0 0x0 0x0 0x0

but not as often as the SCSI Error 24/0 0x0 0x0 0x0 in vmkernel.

Any thoughts of getting rid of this messages?

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depping
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I can't fix them unfortunately for you. But I would suggest calling support. I/O errors shouldn't occur in a normal situation.

Duncan

VMware Communities User Moderator

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benma
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Hey Duncan,

thanks for your fast reply.

If I execute ls -l /vmfs/devices/disks | grep vml.02000c000060a98000486e2f4f475a4e7057586b324c554e202020 (from the error)

I don't receive anything

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Texiwill
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Hello,

I would verify a few things first. It may not be ESX that is the problem.....

1) Do you see lights on both ends of all your cables. Could the cable, gbic, adapter be bad?

2) If your switch has the ability, do you see any errors in its logs or within its management interface?

3) Correlate the logs on ESX with the logs for your SAN. Do you see any issues within your SAN that could cause this.

4) Verify that vmware.log is not growing exponentially with errors, this can cause scsi reservations, etc.

With IO errors it really sounds like it is either the hardware (gbic, cable, HBA) or something else in your fabric. Are these LUNs only zoned to your ESX hosts or to else where?


Best regards,
Edward L. Haletky
VMware Communities User Moderator, VMware vExpert 2009
====
Author of the book 'VMWare ESX Server in the Enterprise: Planning and Securing Virtualization Servers', Copyright 2008 Pearson Education.
Blue Gears and SearchVMware Pro Blogs -- Top Virtualization Security Links -- Virtualization Security Round Table Podcast

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Edward L. Haletky
vExpert XIV: 2009-2023,
VMTN Community Moderator
vSphere Upgrade Saga: https://www.astroarch.com/blogs
GitHub Repo: https://github.com/Texiwill
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