Date: Sun, 28 Jan 2007 22:03:04 +0100 From: "Hansa" <mythtv@logic-q.nl> To: "R. B. Riddick" <arne_woerner@yahoo.com>, "freebsd geom" <freebsd-geom@FreeBSD.ORG> Subject: RE: How do I gmirror slices? Message-ID: <LHEFLGAENILPPDJIHADOCEIKCFAA.mythtv@logic-q.nl> In-Reply-To: <20070128094006.11798.qmail@web30306.mail.mud.yahoo.com>
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> > > Van: R. B. Riddick [mailto:arne_woerner@yahoo.com] > > > > Offset Size(ST) End Name PType Desc Subtype > > > > Flags > > > > > > > > 0 63 62 - 12 unused 0 > > > > 63 12578832 12578894 ad4s1 8 freebsd 165 > > > > 12578895 147814065 160392959 ad4s2 8 freebsd 165 > > > > 160392960 425706435 586099394 ad4s3 8 freebsd 165 > > > > 586099395 15309 586114703 - 12 unused 0 > > > > > > Considder my setup below: > > [----------------------- ad4 ----------------------] (disk) > > [--------- s1 ---------][---- s2 ----][---- s3 ----] (slices) > > [[--a--][--b--][--d--]*][[--- d ---]*][[--- d ---]*] (partitions) > > > > I think the metadata is stored at '*' > > Is it one sector (512Bytes?) smaller than size(a) + size(b) + > size(d) (same > > for s2d and s3d). > > > I would say: s1 is one sector larger than size(a)+size(b)+size(d). > And s2 is 1 sector (512B most likely; depends on ur disks) larger > than size(d). > And s3 dito... Your o so right. Twas late you know :) > > # /dev/ad4s1: > > 8 partitions: > > # size offset fstype [fsize bsize bps/cpg] > > a: 4192256 0 4.2BSD 0 0 0 > > b: 4192256 4192256 swap > > c: 12578832 0 unused 0 0 # "raw" part, don't edit > > d: 4194320 8384512 4.2BSD 0 0 0 > > > Here we see, that d ends on the last sector of slice 1 (s1). > So u need to shrink partition d by one sector. > Since UFS might use that sector, u need an all new file system > for partition > d... How do you determine that it's on the last sector? > Maybe u want to it like this: > 1. fdisk ur new disk first Should I create the the new disk (ad6) slice size exactly as on ad4? > 2. then setup the gmirror-s on the new disk (1. gmirror with only > one slice per > mirror; 2. bsdlabel on the gmirror devices (u can use the full > area, because > gmirror hides the last sector of the slice)). > 3. then copy ad4s3d to some backup media. > 4. then setup the gstripe or gconcat. > 5. then copy the filesystems ad4s1a, ad4s1d and ad4s2d to the gmirror-ed > partitions mirror1a, mirror1d, mirror2d > 6. then restore the backup for the gstripe > 7. add the slices ad4s1 and ad4s2 to the gmirror > 8. ready... :-) Hmm.. I'm already stuck at 1. Since I've never done this before, can you help me on my way by specifying the correct commands? Here's what I've come up with so far: 1. Using fdisk in /stand/sysinstall presuming same slice size as ad4. 2. # gmirror label -v -b round-robin gm0 /dev/ad6s1 # gmirror label -v -b round-robin gm0 /dev/ad6s2 3. # dd if=/dev/ad4s3d of=/mnt/netwshare/ad4s3d.backup 4. Have not dug into that yet. 5. I guess you mean copying ad4s1a, ad4s1b, ad4s1d and ad4s2d to te gmirror-ed. Can I use dd for that? 6. dd or tar the backup on the stripe 7. Eh.. 8. ... Tnx. - Hansa
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