From: Eric Sandeen Subject: Re: Can one file system be R/W mounted multiple times in Linux? Date: Fri, 9 Jan 2015 01:04:36 -0500 (EST) Message-ID: References: <20150109035123.GG22149@ZenIV.linux.org.uk> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 8BIT Cc: Al Viro , "linux-fsdevel@vger.kernel.org" , linux-ext4 , "stefanha@redhat.com" To: Dexuan Cui Return-path: In-Reply-To: Sender: linux-fsdevel-owner@vger.kernel.org List-Id: linux-ext4.vger.kernel.org On Jan 8, 2015, at 10:59 PM, Dexuan Cui wrote: >> -----Original Message----- >> From: Al Viro [mailto:viro@ftp.linux.org.uk] On Behalf Of Al Viro >> Sent: Friday, January 9, 2015 11:51 AM >> To: Dexuan Cui >> Cc: linux-fsdevel@vger.kernel.org; 'linux-ext4'; stefanha@redhat.com >> Subject: Re: Can one file system be R/W mounted multiple times in Linux? >> >>> On Fri, Jan 09, 2015 at 03:44:16AM +0000, Dexuan Cui wrote: >>> The 'mount' utility allows me to mount 1 file systems multiple times at >> different >>> mount points, like "mount /dev/sdb1 /a; mount /dev/sdb1 /b". >>> >>> I tried to write from /a and /b at the same time and it seems everything is OK >>> and no data corruption happens. >>> I tried only ext4 only. >>> >>> Can somebody please tell me if this usage is safe? >> >> Yes. > > Thanks for the confirmation! > > -- Dexuan But to be clear, just in case - this is completely different from, say, mounting the same ext4 fs on two different nodes on a SAN, which is quite certainly not safe... -Eric