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[217.169.3.230]) by mx.google.com with ESMTPS id ep14sm31900876wid.0.2012.08.15.13.48.22 (version=SSLv3 cipher=OTHER); Wed, 15 Aug 2012 13:48:23 -0700 (PDT) From: Mick To: gentoo-user@lists.gentoo.org Subject: Re: [gentoo-user] new installation (ssd, new udev, grub2) Date: Wed, 15 Aug 2012 21:48:34 +0100 User-Agent: KMail/1.13.7 (Linux/3.3.8-gentoo; KDE/4.8.3; x86_64; ; ) References: In-Reply-To: Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-Id: Gentoo Linux mail X-BeenThere: gentoo-user@lists.gentoo.org Reply-to: gentoo-user@lists.gentoo.org MIME-Version: 1.0 Content-Type: multipart/signed; boundary="nextPart1792211.5GuzeRijJ4"; protocol="application/pgp-signature"; micalg=pgp-sha1 Content-Transfer-Encoding: 7bit Message-Id: <201208152148.53984.michaelkintzios@gmail.com> X-Archives-Salt: e2fd0d49-30a4-4ffc-a658-6982929371e1 X-Archives-Hash: bf972d633ea1ab15dc2454734e82f1be --nextPart1792211.5GuzeRijJ4 Content-Type: Text/Plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable On Wednesday 15 Aug 2012 17:42:02 Paul Hartman wrote: > On Tue, Aug 14, 2012 at 9:33 PM, J.Marcos Sitorus wrot= e: > > Hi guys, after quick read about ssd, I have a couple of question: > > 1. My friend have new server with a ssd installed. He plan to RHEL 5.7 > > (I don't know why he choose this) on it. On redhat website, it say > > something like this: > > "However, if the device does not export topology information, Red Hat > > recommends that the first partition be created at a 1MB boundary." > > What does it mean by 1MB boundary? Does it mean he have to create 1MB > > free space in front or he have to create a 1MB partition in front of > > his actual partition(s)? >=20 > When you run fdisk and it asks starting sector, choose one that has > 1MB of free space in front of it. Flash memory, like magnetic disks, > writes and erases in blocks, so improper alignment can cause multiple > read/writes to happen when only one should have been necessary. Most > flash-based memory has erase blocks with multiples of 4MB so I always > begin the partition at 4MB to be safe. Magnetic disks have much > smaller blocks so 1MB is the usual recommendation for those (since 1MB > is safely divisible by 64k/32k/16k/8k/512b etc.) though if you know > the actual block size on your disk you can go smaller than 1MB. >=20 > > 2. Is it possible to combine TRIM support and ext3 partition (AFAIK, > > RHEL 5.7 haven't support ext4)? >=20 > Basically no. Depending on kernel & everything else version there > might be offline trim support ioctl, but not automatic. Don't know > anything about RHEL but maybe xfs supported TRIM in that version. >=20 > > *i hope this is not count as hijacking >=20 > Don't know if it is hijacking, but it is not an RHEL list, and > top-posting can get an angry mob started. :) Grrrrr! :@ LOL! Anyway, I am told that Gparted now adds a 1M unallocated space before a=20 partition is created (and shows it too) as long as one leaves the default=20 alignment option of 'MiB', rather than 'cylinders'. I'm not sure what it does if you select cylinders. May still create it, bu= t I=20 seem to recall that older versions of Gparted did not show unallocated spac= e=20 less than 8M. I think that current versions of fdisk also provide a 1M boundary, or is it= =20 4M? Someone more up to speed on this can comment. =2D-=20 Regards, Mick --nextPart1792211.5GuzeRijJ4 Content-Type: application/pgp-signature; name=signature.asc Content-Description: This is a digitally signed message part. -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.19 (GNU/Linux) iEYEABECAAYFAlAsCzUACgkQVTDTR3kpaLbHBACguSu/MEgvqlT4/Q47qDxdtWB8 8ocAoL3Kwo10tMWtqYnoqqklCaRLpI+3 =ZPle -----END PGP SIGNATURE----- --nextPart1792211.5GuzeRijJ4--