Hi I am very new to this and am trying to learn because I'm very interested in this. Is there anyway someone would help someone like me. Thank you
On Wed, Sep 12, 2018, 12:01 PM <dm-devel-request@xxxxxxxxxx> wrote:
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Today's Topics:
1. Re: [PATCH] libmultipath: Increase SERIAL_SIZE to 256 bytes
(Martin Wilck)
----------------------------------------------------------------------
Message: 1
Date: Wed, 12 Sep 2018 15:36:02 +0200
From: Martin Wilck <mwilck@xxxxxxxx>
To: KyleMahlkuch <kmahlkuc@xxxxxxxxxxxxxxxxxx>, dm-devel@xxxxxxxxxx
Subject: Re: [PATCH] libmultipath: Increase SERIAL_SIZE to
256 bytes
Message-ID: <f9c5e7fbc2136573a098b8aed475ce4eb7c0bf2a.camel@xxxxxxxx>
Content-Type: text/plain; charset="UTF-8"
On Tue, 2018-08-28 at 16:34 -0500, KyleMahlkuch wrote:
> Certain IBM FlashSystem LUNs can return up to 85 bytes of serial
> number in the Unit Serial Number VPD page, which is larger than
> the current SERIAL_SIZE definition of 65 bytes. Since the max
> size of this field does not appear to be defined in SPC, increasing
> to 256 bytes should hopefully prevent us from hitting this
> in future.
>
I'm not against it, but would 128 be enough, too? That's what we use
for WWID.
> This is an example of a serial number from a FlashSystem:
> Unit serial number VPD page:
> Unit serial number:
> 3321360050764008101AB300000000000012204214503IBMfcp
$ echo 3321360050764008101AB300000000000012204214503IBMfcp | wc -c
52
It looks as if 65 bytes would be sufficient for _this_ serial number.
Is there excessive space padding at the end, maybe? Run
sg_vpd -p sn -r $DEV | hexdump -C
>
> Before this patch multipath returns the error:
> Jul 17 11:24:58 | vpd pg80 overflow, 85/65 bytes required
>
> After the patch is applied the error no longer occur.
>
> Signed-off-by: Kyle Mahlkuch <kmahlkuc@xxxxxxxxxxxxxxxxxx>
> ---
> libmultipath/structs.h | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
Thanks,
Martin
--
Dr. Martin Wilck <mwilck@xxxxxxxx>, Tel. +49 (0)911 74053 2107
SUSE Linux GmbH, GF: Felix Imend?rffer, Jane Smithard, Graham Norton
HRB 21284 (AG N?rnberg)
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