Date: Mon, 2 Mar 1998 23:23:14 +0000 (GMT) From: Terry Lambert <tlambert@primenet.com> To: sbabkin@dcn.att.com Cc: tlambert@primenet.com, shimon@simon-shapiro.org, wilko@yedi.iaf.nl, grog@lemis.com, jdn@acp.qiv.com, blkirk@float.eli.net, hackers@FreeBSD.ORG Subject: Re: SCSI Bus redundancy... Message-ID: <199803022323.QAA24805@usr09.primenet.com> In-Reply-To: <C50B6FBA632FD111AF0F0000C0AD71EE4132C8@dcn71.dcn.att.com> from "sbabkin@dcn.att.com" at Mar 2, 98 02:23:50 pm
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> > You would have to remember to grab the blocks to be relocated with > > the same O(n) randomness as their allocation. 8-). > > Huh ? Probably I've missed something about RAIDs. I've thought > that, for example, RAID block 0 consists of blocks 0 of all > the physical disks. And so on. And I've thought that RAID itself > does not allocate any blocks, the upper level like filesystem or > volume manager does it, RAID just makes chechsuming. Am I wrong again ? If I allocate N stripes on M devices, I have N/M stripes per device. If I add a device, I do not automagically end up with N/(M+1) stripes per device. I have to move some stripes around. Terry Lambert terry@lambert.org --- Any opinions in this posting are my own and not those of my present or previous employers. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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