From mboxrd@z Thu Jan 1 00:00:00 1970 From: Farkas Levente Subject: Re: maximum size Date: Tue, 27 Sep 2005 15:51:10 +0200 Message-ID: <43394E4E.4060702@bppiac.hu> References: <43394753.9040107@bppiac.hu> <17209.18879.583532.761762@cse.unsw.edu.au> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <17209.18879.583532.761762@cse.unsw.edu.au> Sender: linux-raid-owner@vger.kernel.org To: Neil Brown Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids Neil Brown wrote: > On Tuesday September 27, lfarkas@bppiac.hu wrote: > >>hi, >>i'd been already asked, but don't get any answer. what is the maximum >>size of a raid5 and raid5 partition in kerenel 2.6? i try to find the >>answer but found only kernel 2.4 info. >>thanks in advance. >> > > > Providing you are using either 64bit hardware, or the 'LBD' (large > block device) config, then raid5 arrays can be up to 2^64 - > i.e. enormous - no practical limit. huu, i don't know. we use 3ware 7506 controller. on it onw homepage it said: --------------------------- Supports up to 12 drives with a single PCI card enabling up to 3.6 terabytes of storage (dependent on drive capacity, 2TB per array maximum) --------------------------- but it's all about the hardware raid5. so it's native hardware raid5 can't be larger than 2TB. and another quote: --------------------------- PCI 2.2 compliant 64-bit / 66MHz bus master (2-port controllers are 32-bit / 66MHz PCI compliant) --------------------------- but it's the pci bus interface not the device. and as we use in jbod mode there is no info about it. and i read again the spec but can't find any info about it. > I don't know what you mean by 'raid5 partition'. If you mean like a > regular partition of a device, then the partition can be nearly as bit > as the array.... suppose i create the raid device with: mdadm --create /dev/md0--level=5 --raid-devices=8 --spare-devices=1 /dev/sd[abcdefgh]1 then what is the maximum size for /dev/md0? (or more precisely after a mkfs.ext3 /dev/md0). yours. -- Levente "Si vis pacem para bellum!"