From mboxrd@z Thu Jan 1 00:00:00 1970 From: NeilBrown Subject: Re: question about raid10 near copy info in man mdadm. Date: Mon, 16 Apr 2012 15:41:26 +1000 Message-ID: <20120416154126.2fb059da@notabene.brown> References: <201204161328097657740@gmail.com> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=PGP-SHA1; boundary="Sig_/JgK2agu8WSB4c3jw2RY+rd4"; protocol="application/pgp-signature" Return-path: In-Reply-To: <201204161328097657740@gmail.com> Sender: linux-raid-owner@vger.kernel.org To: kedacomkernel Cc: linux-raid List-Id: linux-raid.ids --Sig_/JgK2agu8WSB4c3jw2RY+rd4 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: quoted-printable On Mon, 16 Apr 2012 13:28:14 +0800 "kedacomkernel" wrote: > Hi: > I readed the information about raid10 near copy in man mdadm. > It is: > 'n' signals 'near' copies. Multiple copies of one data block are at sim= ilar offsets in different > devices. > But I think this wrong. > If raid10 had five disks and near copy is equal three. > The layout like: > 5 disks > -------------------- > A1 A1 A1 A2 A2 > A2 A3 A3 A3 A4 >=20 > But the copies of datablock A2 are not at similar offset in different dev= ice. >=20 They are certainly on different devices so I guess you are questioning the use of the word "similar". What do you understand "similar" to mean? How would you describe offsets which might be the same, or might differ by one chunk-size? I'm happy to change the text if it is confusing, but only if the result is undoubtedly less confusing. NeilBrown --Sig_/JgK2agu8WSB4c3jw2RY+rd4 Content-Type: application/pgp-signature; name=signature.asc Content-Disposition: attachment; filename=signature.asc -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.18 (GNU/Linux) iQIVAwUBT4uxBjnsnt1WYoG5AQKgkxAAom5KBYbZQc4Uv6ikjZb0DZPNH+BIAv0N pgkzJyCwpLlGSByALi4HuHWXlkV9QIwM3fyLSDK7uTdpH20uz/IR5iGBdXn3Ite1 sAt8e2l2E2ScyhXpdI+3WwpKWcmEg7CRn9FSJvIYnlyvGNmlvRJyZ/1J2p1NcHK5 MYUKcAaW07OQguoDuPsxHIHQXcbR201lHRQ6iYO2dyC2ngaVW1RsTEzvEiYLRUxr ei9Gwd4zN5PnaqUN+qjZ9sKl/lMsfQwrTMGYHonNaM+lMGyi70BXtf9bQ7e95Ea1 6t7YUXK2yOCQutOjPP6ZnhTa5jb7TkYwhgNl27JCtS4CO4h6HNzhVXDu1A5BJe8u 5qPwiAlHg0NtudLgn0eaLO8rWDEJm9YY2+WCYcUz1KpZuMalAyaFNY2D0GmVHt5i a/6zwRKEJWTFh+ONugTuj9piOR/pVHbTT0P8vLUaLtJre5i2vNDMGTdkB9ysJXcJ GCi+EbbOE5/9AO78j5nJxOxnMEE3tzusUwckxKzOGgG+USm1RQY6yp7s/qb5sQqA k5VqodtjPTcXVRlBU4SfQn3XrgWCzdrYvjtuxOthQIoY2ziv59/+HaCxX+nryQ20 sHEwe/YUh8WTOyKITPs19QXHHuc6z9rYRiwdNmc38PFaccwtKOV1MAtx1TdooW4c 71uyvrLSOsM= =UYfJ -----END PGP SIGNATURE----- --Sig_/JgK2agu8WSB4c3jw2RY+rd4--