[OpenIndiana-discuss] VMware (OpenIndiana-discuss Digest, Vol 37, Issue 15)

[James Relph]

I've looked at subsystem performance and had things like zpool iostat running when the issue was occurring, and there's just nothing stressing the systems enough.  Plus the OpenIndiana servers using the same servers as iSCSI targets has no iSCSI errors at the same time as VMware is freaking out.  I would have expected the Oi initiators to at least log a few re-writes or iSCSI errors if it was a general "the iSCSI target is misbehaving" problem.

Thanks,

James

Principal Consultant

Website:		www.themacplace.co.uk

On 14 Aug 2013, at 08:33, Ong Yu-Phing <ong.yu.phing at group.ong-ong.com> wrote:

> so far we've been discussing network.  How about the disk subsystem side?  I've had a situation where a rebuild (RAID10 equivalent with 3x RAID1 vdevs, had to replace a faulty disk), together with an overnight snapshot and replication to another server, was "enough" to cause iscsi timeouts.
> 
> On 13/08/2013 21:18, Doug Hughes wrote:
>> We have lacp working between force10, hp, and cisco switches in all possible combinations with no difficulties. We do monitor and alert on excessive errors and drops for interfaces, but lacp isnt a culprit. If anything, it's an underlying interface when we find them. Also, it beats the heck out of spanning tree and is 2 orders of magnitude simpler than ospf, and 1 order simpler and more portable than ecmp. I am quite surprised by your observations.
>> 
>> Sent from my android device.
>> 
>> -----Original Message-----
>> From: "Edward Ned Harvey (openindiana)" <openindiana at nedharvey.com>
>> To: Discussion list for OpenIndiana <openindiana-discuss at openindiana.org>
>> Sent: Tue, 13 Aug 2013 7:22 AM
>> Subject: Re: [OpenIndiana-discuss] VMware
>> 
>>> From: James Relph [mailto:james at themacplace.co.uk]
>>> Sent: Monday, August 12, 2013 4:47 PM
>>> 
>>> No, we're not getting any ping loss, that's the thing.  The network looks
>>> entirely faultless.  We've run pings for 24 hours with no ping loss.
>> Yeah, I swore you said you had ping loss before - but if not - I don't think ping alone is sufficient.  You have to find the error counters on the LACP interfaces.  Everybody everywhere seems to blindly assume LACP works reliably, but to me, simply saying the term "LACP" is a red flag.  It's extremely temperamental, and the resultant behavior is exactly as you've described.
>> 
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