Date: Sat, 28 Feb 1998 13:10:44 -0500 From: sbabkin@dcn.att.com To: shimon@simon-shapiro.org, wilko@yedi.iaf.nl, grog@lemis.com Cc: jdn@acp.qiv.com, blkirk@float.eli.net, hackers@FreeBSD.ORG Subject: RE: SCSI Bus redundancy... Message-ID: <C50B6FBA632FD111AF0F0000C0AD71EE4132C6@dcn71.dcn.att.com>
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> ----------
> From: Greg Lehey[SMTP:grog@lemis.com]
>
> > I think Julian's SLICE code has something in that direction. DPT
> > supports INCREASING the size of a RAID-5 array by adding drives.
>
> How can that work?
>
Something like
- read N RAID blocks from K disks
- compute new checksum for K+1 disks and write as less number
of RAID blocks but each one of bigger size (K+1/K times)
- add empty blocks at the end of RAID in the added space
What am I wondering is why nobody did that before ? It's so boring
to rebuild the whole RAID if all you want is to add or remove a disk.
-SB
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