From mboxrd@z Thu Jan 1 00:00:00 1970 From: Roy Sigurd Karlsbakk Subject: Re: bcache vs enhanceio? Date: Tue, 12 Feb 2013 21:41:20 +0100 (CET) Message-ID: <23363144.24.1360701679980.JavaMail.root@zimbra> References: <5114334D.7040709@networklabs.co.nz> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: In-Reply-To: <5114334D.7040709-3e6jenk95VYpDvLZ8AWkcaVXKuFTiq87@public.gmane.org> Sender: linux-bcache-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Andrew Thrift Cc: linux-bcache-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: linux-bcache@vger.kernel.org Wouldn't it be better to allow the sysadmin to determine the safety? Also, if running in writethrough, why shouldn't an SSD be allowed to be= added in realtime? All of this works well with systems like ZFS. I really don't see a reas= on for a filesystem being created to allow caching roy ----- Opprinnelig melding ----- > Hi Roy, >=20 > This is by design, and minimizes the potential for data corruption. >=20 > If you have a backing device with an existing filesystem, and are > caching this in writeback mode, then reboot the system and the cache > device does not come up, the backing device could still come up and > could potentially be out of sync with the writes that were buffered t= o > the cache device. >=20 > With bcache in writeback mode, if it cannot attach the cache device i= t > will not register the backing device. >=20 >=20 > I am sure Kent will provide a much better answer than I have :) >=20 >=20 >=20 >=20 > Regards, >=20 >=20 >=20 >=20 > Andrew >=20 > On 2/8/2013 10:25 AM, Roy Sigurd Karlsbakk wrote: > > Hi > > > > Seems old flashcache and the new enhanceio can add flash drives on > > the run, while bcache needs the filsystem to be built with them. > > > > What is the future of bcache in this setting? > > --=20 Vennlige hilsener / Best regards roy -- Roy Sigurd Karlsbakk (+47) 98013356 roy-ooPBL11mRiZbRRN4PJnoQQ@public.gmane.org http://blogg.karlsbakk.net/ GPG Public key: http://karlsbakk.net/roysigurdkarlsbakk.pubkey.txt -- I all pedagogikk er det essensielt at pensum presenteres intelligibelt.= Det er et element=C3=A6rt imperativ for alle pedagoger =C3=A5 unng=C3=A5= eksessiv anvendelse av idiomer med xenotyp etymologi. I de fleste tilf= eller eksisterer adekvate og relevante synonymer p=C3=A5 norsk.