[Linux-PowerEdge] cancel my subscription
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Wed Sep 16 12:09:42 CDT 2015
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On 16 Sep 2015 20:00, <linux-poweredge-request at dell.com> wrote:
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> Today's Topics:
> 1. Re: PERC H730 issues (extended LD support, span element
> misdetection) (Linda A. Walsh)
> Message: 1
> Date: Tue, 15 Sep 2015 20:21:26 -0700
> From: "Linda A. Walsh" <dell at tlinx.org>
> Subject: Re: [Linux-PowerEdge] PERC H730 issues (extended LD support,
> span element misdetection)
> To: Stephen Dowdy <sdowdy at ucar.edu>
> Cc: "linux-poweredge at dell.com" <linux-poweredge at dell.com>
> Message-ID: <55F8E036.3010705 at tlinx.org>
> Content-Type: text/plain; charset=UTF-8; format=flowed
> Stephen Dowdy wrote:
> > I have a Poweredge T630 with PERC H730 Adapter running Debian Jessie
> > ? ?
> > # lspci -mmnn | grep PERC
> > ? ?
> > 03:00.0 "RAID bus controller " "LSI Logic / Symbios Logic "
> > "MegaRAID SAS-3 3108 [Invader] [005d]" -r02 "Dell " "PERC H730
> > Adapter [1f43]"
> > ?It has 18 4TB SATA disks.?
> > ?Using stock kernel (3.16.0-4-amd64) or backports kernel
> > (4.1.0-0.bpo.1-amd64/megaraid_sas=06.806.08.00-rc1) i see multiple
> > 'dmesg' statements of form:
> > ?[ 2.798743] megasas:span 0 rowDataSize 10
> > ?RHEL has a paid/subscriber page on this that is not very helpful.
> > Basically, the claim is that this message indicates that the kernel and
> > the PERC firmware disagree on the #elements in a span. The numbers are
> > printed as %x, so kernel thinks SPAN 0 has 16 elements in it, whereas,
> > the system has 18 4TB SATA drives in a single RAID6 disk group with 4
> > Logical Volumes of various sizes. It is unclear to me if there is any
> > potential catastrophic (data destructive) end-result from this
> > discrepency, or any performance related issues, or if it's just an
> > informational message.
> Just a random opinion, but the 'parity' disks (of which RAID6
> has 2) aren't usually considered 'data' disks. So if you have 18 disks
> in all, most linux utils that talk about RAID size talk about the width
> of the DATA SPAN -- because that's what is important to have lined up
> with various volume and disk structures.
> I.e. say you have a 64K stripe unit x 16 data stripes. If
> you had that in a RAID5, it would be 17 disks as it is 18 w/RAID6.
> The system needs 64Kx16=1MB alignment which most modern partition
> managers formatters will default to. Example with xfs, you can specify
> a file system size in terms of "swidth+sunit" or su+sw -- su=# bytes
> on 1 stripe, while sw = a multiplier of the stripe unit, usually the same
> number of data disks in a RAID device (paraphrase of mkfs.xfs manpage).
> I.e. Between that... and if the disks are working I wouldn't
> be too concerned. The controller pretty much takes care of the layout
> of the RAID on disk -- not the linux kernel (unless you use the software
> MD RAID driver), which I wouldn't suggest if you have a dedicated card.
> > But that's not all ...
> > perccli /c0 show events type=sincereboot filter=warning
> > ...
> > Event Description: Host driver needs to be upgraded to enable
> > extended LD support
> > ...
> > ?(this message appears in the 3.16 kernel, which is why i tried out the
> > 4.1 kernel, in which the message does not appear. I can't find any
> > documentation that defines exactly what "Extended LD support" for a
> > MegaRAID card actually entails, but it doesn't fix the span #elements
> > mis-detection issue.
> If you go to the docs & downloads for LSI's stuff,
> or the new site @
> The README on the new firmware has a notation about portability
> issues between that firmware and firmware for a
> 240_VD_Feature_Limitations_Known_Issues. Seems like there are
> 2 versions of the firmware. So just a W-A-G on my part, but
> it might be referring to firmware upgrades to support 240 VD's?
> But that *really* is a guess.
> Best of luck!
> remember -- RAID6 is not a backup solution! ;-)
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> End of Linux-PowerEdge Digest, Vol 136, Issue 8
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