Date: Sun, 4 Nov 2018 15:47:16 +0000 From: Rick Macklem <rmacklem@uoguelph.ca> To: Julian Elischer <julian@freebsd.org>, Andriy Gapon <avg@FreeBSD.org>, Konstantin Belousov <kostikbel@gmail.com> Cc: FreeBSD Filesystems <freebsd-fs@freebsd.org> Subject: Re: How to fill in the fsid for file systems? Message-ID: <YTOPR0101MB11625B448278C5FAA1625772DDC90@YTOPR0101MB1162.CANPRD01.PROD.OUTLOOK.COM> In-Reply-To: <YTOPR0101MB1162A8CA4B3AAF230E73158DDDC90@YTOPR0101MB1162.CANPRD01.PROD.OUTLOOK.COM> References: <YTOPR0101MB11620BAF0E206EE36E927A5ADDF30@YTOPR0101MB1162.CANPRD01.PROD.OUTLOOK.COM> <20181030012240.GM5335@kib.kiev.ua> <YTOPR0101MB11621427AF47133A93311E16DDCD0@YTOPR0101MB1162.CANPRD01.PROD.OUTLOOK.COM> <e7813a64-59c2-67a1-3471-b32a6ca42ef8@FreeBSD.org> <YTOPR0101MB116207BA89FB66EE9B1AAF01DDCD0@YTOPR0101MB1162.CANPRD01.PROD.OUTLOOK.COM> <a831d660-1ed9-ef21-f457-8e1e986b96f2@FreeBSD.org> <YTOPR0101MB11621C0D5F4F4D9BED169110DDCF0@YTOPR0101MB1162.CANPRD01.PROD.OUTLOOK.COM>, <c98b999c-c4b8-55fe-adef-ac53e439487b@freebsd.org>, <YTOPR0101MB1162A8CA4B3AAF230E73158DDDC90@YTOPR0101MB1162.CANPRD01.PROD.OUTLOOK.COM>
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Julian Elischer wrote: [stuff snipped] >Rick Macklem wrote: >> >> Maybe someone can explain when it would be useful for FFS (or not)? >SO lets' just make the usage model clear: >I believe that what Josh needs is to have a two High availability >servers viewing a single >(cloud based) filesystem, export the same FSID so that when one takes >over for the other >the clients don't notice. Well, for UFS/FFS, if it is the same physical storage or the file system wa= s cloned via a block for block copy (like using dd(1)), then it shouldn't be a probl= em, since the fsid comes out of the superblock. *** added comment Oh, and I am not sure what happens w.r.t. the fsid for UFS snapshots? rick
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