From mboxrd@z Thu Jan 1 00:00:00 1970 From: Roy Sigurd Karlsbakk Subject: Re: RAID10 layout question Date: Fri, 15 Feb 2013 19:58:10 +0100 (CET) Message-ID: <29203573.10.1360954690174.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: Chris Jones Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids > 2) Will I take a performance hit if I manually make two RAID1 sets an= d > then a RAID0 of them? I'd rather use separate mirrors (raid1) and use lvm on top of that - be= tter flexibility. > 3) Should I forget about the layout and just use RAID6? Depends what you need. RAID-6 will give you lower IOPS, but better sequ= encial I/O. It will also stand *any* two drives failing, while striped = mirrors (raid-10 or raid-1 with raid-0/lvm on top) will only tolerate a= single drive failing per mirror. The chances of two drives failing at = the same time is low, but it's rather common to see a single drive fail= ing and then seeing bad data on another drive. If not scterc (smartctl = etc) is enabled, or the timeout (/sys/block/$dev/device/timeout) hasn't= been increased, a single bad sector may make md kick out a drive, whic= h would be bad if it's rebuilding a mirror. Personally, I use RAID-6 - = it's safe and fast enough for my needs. 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