From mboxrd@z Thu Jan 1 00:00:00 1970 From: Steven Haigh Subject: Re: What layout with 6x2TB, Intel Atom? Date: Tue, 05 Feb 2013 09:59:59 +1100 Message-ID: <51103D6F.8060602@crc.id.au> References: <20130205031232.61813f6c@natsu> Mime-Version: 1.0 Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha1; boundary="------------ms040407010001000802010903" Return-path: In-Reply-To: <20130205031232.61813f6c@natsu> Sender: linux-raid-owner@vger.kernel.org To: linux-raid@vger.kernel.org List-Id: linux-raid.ids This is a cryptographically signed message in MIME format. --------------ms040407010001000802010903 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: quoted-printable On 5/02/2013 8:12 AM, Roman Mamedov wrote: > On Mon, 4 Feb 2013 20:27:42 +0000 > Mathias Bur=C3=A9n wrote: > >> I read that the far layout gives faster read performance compared to >> standard RAID1 in a 2 HDD array, so that's why I used it. I then >> created yet another RAID10 f2 layout of the 3x 2 disk RAID10 volumes, >> giving me /dev/md124. Filesystem doesn't matter, I need something >> that's stable with good performance over the RAID set. >> I just realized that out of 12 TB raw space I now only have 3TB >> available, heh. So I suppose I'm going for a different layout. >> >> Any opinions? > > Hello, > > Why won't you even consider RAID6? To me it seems like the perfect choi= ce, > given the details you described (mostly reads, large files, few clients= ). > And the disk count is perfect, not too few and not too many, so to say = :D > I was going to say the same. I run a 4 x 2Tb SATA RAID6. The read speeds = will *easily* saturate GigE. Random seeks slow things down quite a bit - = but you'll get that with any setup except SSD. If its mainly sequential reads, then RAID6 will be fine. And as I know someone will ask... Why 4 drives in RAID6? Firstly, you=20 still get the redundancy of surviving 2 drive failures - but also when I = start to run low on space I can easily add another 2Tb disk and reshape=20 to 5 drives, then 6. My chassis has 8 x SATA hot swap bays - 2 x 80Gb=20 RAID1 leaving the other 6 for the RAID6. By the time I fill up 6 x 2Tb=20 drives, there will be other cheap multi-Tb drives to use. --=20 Steven Haigh Email: netwiz@crc.id.au Web: http://www.crc.id.au Phone: (03) 9001 6090 - 0412 935 897 Fax: (03) 8338 0299 --------------ms040407010001000802010903 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIIMdTCC BjQwggQcoAMCAQICAR4wDQYJKoZIhvcNAQEFBQAwfTELMAkGA1UEBhMCSUwxFjAUBgNVBAoT DVN0YXJ0Q29tIEx0ZC4xKzApBgNVBAsTIlNlY3VyZSBEaWdpdGFsIENlcnRpZmljYXRlIFNp Z25pbmcxKTAnBgNVBAMTIFN0YXJ0Q29tIENlcnRpZmljYXRpb24gQXV0aG9yaXR5MB4XDTA3 MTAyNDIxMDE1NVoXDTE3MTAyNDIxMDE1NVowgYwxCzAJBgNVBAYTAklMMRYwFAYDVQQKEw1T dGFydENvbSBMdGQuMSswKQYDVQQLEyJTZWN1cmUgRGlnaXRhbCBDZXJ0aWZpY2F0ZSBTaWdu aW5nMTgwNgYDVQQDEy9TdGFydENvbSBDbGFzcyAxIFByaW1hcnkgSW50ZXJtZWRpYXRlIENs 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