Date: Fri, 1 Oct 1999 10:54:00 -0700 (PDT) From: jin@george.lbl.gov To: narvi@haldjas.folklore.ee Cc: hackers@FreeBSD.ORG Subject: Re: SCSI disk naming problem Message-ID: <199910011754.KAA19866@george.lbl.gov>
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> See LINT on details of how to wire down scsi devices... > > Your proposal doesn't take adding a second scsi card into account. Well, I did not mean that has to be da0, da1, etc., but similar thing like dac0t0d0, dac0t1d0, ... dac3t4d0, etc. which is much clear what disk is. A few people does not like this one because the name is long, and it is like some commerical configuration. They said that this is Free software. Manually wiring down disks is OK for a small set of hosts. 100+ hosts with two or three controllers with 100 TB disks will be terribly pain during the setup and maintenance. -Jin > On Fri, 1 Oct 1999 jin@george.lbl.gov wrote: > > > Current FreeBSD SCSi disk naming mechanism is problem for using more than > > one disks in the chain during the disk failure. > > > > The problem is that the name is not fixed with is SCSI ID. e.g., > > if one disk is presented in the chain, regardless its SCSI ID, it is > > always named "da0"; > > > > if two disks are installed, the one with lower ID is named da0 and the > > other will be named as da1. When the lower ID one is crashed, then the > > other disk will be named as da0 (from da1) after reboot, and it is not > > mountable due to the name changing. > > > > If a system has a UW SCSI controller with 15 disks in the chain, > > when the first disk (ID = 0) crashed, all rest 14 disks will be > > useless until either fstab modified or another disk is added with > > SCSI ID = 0. > > > > Why not we use a fixed name corresponding the SCSI ID. That is, > > disk with ID 0 will be always named as da0, and disk with ID 1 > > will be always named da1, etc.? > > > > Is there problem with fixed disk naming mechanism? , To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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