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Date:      Sat, 28 Feb 1998 14:21:35 -0800 (PST)
From:      Simon Shapiro <shimon@simon-shapiro.org>
To:        sbabkin@dcn.att.com
Cc:        hackers@FreeBSD.ORG, blkirk@float.eli.net, jdn@acp.qiv.com, grog@lemis.com, wilko@yedi.iaf.nl
Subject:   RE: SCSI Bus redundancy...
Message-ID:  <XFMail.980228142135.shimon@simon-shapiro.org>
In-Reply-To: <C50B6FBA632FD111AF0F0000C0AD71EE4132C6@dcn71.dcn.att.com>

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On 28-Feb-98 sbabkin@dcn.att.com wrote:
>> ----------
>> 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.

Like I said;  More than one way to skin a cat.  I still prefer to have
someone else do it for me (who is beter, etc.), but this is only me.
We can always do all this in the O/S kernel...

----------


Sincerely Yours, 

Simon Shapiro
Shimon@Simon-Shapiro.ORG                      Voice:   503.799.2313

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