From mboxrd@z Thu Jan 1 00:00:00 1970 From: Roy Sigurd Karlsbakk Subject: Re: Possible to change chunk size on RAID-1 without re-init or destructive result? Date: Wed, 27 Mar 2013 17:01:34 +0100 (CET) Message-ID: <16639206.20.1364400094382.JavaMail.root@zimbra> References: Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: In-Reply-To: Sender: linux-raid-owner@vger.kernel.org To: Jeff Johnson Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids =46rom the manual -c, --chunk=3D Specify chunk size of kibibytes. The default when creat= ing an array is 512KB. To ensure compatibility with ear=E2=80=90 lier versions, the default when Building and array with n= o persistent metadata is 64KB. This is only meaningful for RAID0, RAID4, RAID5, RAID6, and RAID10. meaning - chunk size isn't relevant to a mirror ----- Opprinnelig melding ----- > Greetings, >=20 > I have a RAID-1, two disk volume that was created with a strange chun= k > size. For reasons I won't go into here removing the data and > redefining a new RAID-1 volume with a different chunk size is > presently not a viable option. >=20 > Since this is a two disk mirror I should, /*theoretically*/ be able t= o > redefine the chunk size without impacting existing data. I have never > attempted such a thing and am not sure how best to go about it. I kno= w > in a striped data level like RAID-5 or RAID-6 this would absolutely > not be possible. >=20 > I know I would have to set a different chunk size in the superblock. > Google and wiki research do not show a clear method to do this. >=20 > Any suggestions are appreciated. >=20 > --Jeff >=20 >=20 > -- > ------------------------------ > Jeff Johnson > Co-Founder > Aeon Computing >=20 > jeff.johnson@aeoncomputing.com > www.aeoncomputing.com > t: 858-412-3810 x101 f: 858-412-3845 >=20 > 4170 Morena Boulevard, Suite D - San Diego, CA 92117 > -- > To unsubscribe from this list: send the line "unsubscribe linux-raid" > in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html --=20 Vennlige hilsener / Best regards roy -- Roy Sigurd Karlsbakk (+47) 98013356 roy@karlsbakk.net 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. -- To unsubscribe from this list: send the line "unsubscribe linux-raid" i= n the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html