Re: cancel my subscription

Dear dell
Cancel my subscription from your mailing list
Best regard

maher
On 16 Sep 2015 20:00, <[email protected]> wrote:

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> Today's Topics:
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>    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" <[email protected]>
> Subject: Re: [Linux-PowerEdge] PERC H730 issues (extended LD support,
>         span element misdetection)
> To: Stephen Dowdy <[email protected]>
> Cc: "[email protected]" <[email protected]>
> Message-ID: <[email protected]>
> Content-Type: text/plain; charset=UTF-8; format=flowed
>
> Stephen Dowdy wrote:
> > I have a Poweredge T630 with PERC H730 Adapter running Debian Jessie
> (8.1)
> >
> > ?    ?
> > # lspci -mmnn | grep PERC
> > ?    ?
> > 03:00.0 "RAID bus controller [0104]" "LSI Logic / Symbios Logic [1000]"
> > "MegaRAID SAS-3 3108 [Invader] [005d]" -r02 "Dell [1028]" "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,
> http://www.lsi.com/support/pages/download-results.aspx
>  or the new site @
> http://www.avagotech.com/support/download-search
>
> 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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