Date: Thu, 24 May 2007 08:31:03 -0500 From: Jack Barnett <jackbarnett@gmail.com> To: "illoai@gmail.com" <illoai@gmail.com> Cc: kalin@el.net, freebsd-questions@freebsd.org Subject: Re: raid or not raid Message-ID: <46559397.3040108@gmail.com> In-Reply-To: <d7195cff0705240407w50617086i6ebbdfc4b9eaeac1@mail.gmail.com> References: <54316.74.2.36.140.1179892303.squirrel@mail.el.net> <61733.74.64.6.149.1180002606.squirrel@mail.el.net> <d7195cff0705240407w50617086i6ebbdfc4b9eaeac1@mail.gmail.com>
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illoai@gmail.com wrote: > On 24/05/07, kalin mintchev <kalin@el.net> wrote: >> >> so nobody on this list knows anything about raid? >> wrong list? >> >> > hi all.. >> > >> > i have a box in a remote hosting facility that claims that the >> machine has >> > two discs raided in it but df and fstab show only one disc with a >> bunch of >> > slices. >> > under devices there is another name - ad6 - but it's not mounted >> anywhere. >> > the one i see both in df and the fstab is ad4 with one big slice and >> > different partitions.... >> > >> > they insist there are 2 raided discs in tha machine. the os is 5.4 >> and i >> > think at that point the raid drivers were still considered >> 'experimental'. >> > >> > it makes sense to me that if i don't see a second drive in the >> fstab there >> > isn;t any mounting which means that there is no raid going on... >> > >> > is there any other way i can make sure if raid is actually on? >> > would there will be any logs somewhere? >> > the machine has been up for about 2 years and the dmesg is long >> gone... >> > >> > thanks..... >> > > > Lots of people here know plenty about RAID, > but you don't provide very much information. > > If dmesg itself returns none of the startup info, > you can look in /var/log/dmesg.[today|yesterday]. > > /usr/sbin/pciconf can tell you what controller(s) > may be attached. > > A proper RAID will show up as a single device, > just like any hard drive (but different). > > It does seem odd to me that a (supposed) RAID > would show up as /dev/ad4. > > Possibilities: > Your RAID really is on /dev/ad4 and /dev/ad6 is > something unexplained. > Your RAID controller is unsupported in 5.x and > not Doing The Right Thing but somehow still (kind > of) working as a normal [S]ATA controller. > Your RAID controller is unsupported in 5.x and > your hosting company realised this and wired > the shebang up as a normal [S]ATA controller > because they couldn't get FreeBSD to install > otherwise. > There is a RAID controller and there are two disks > connected to it, but the controller was not set up > correctly. > There is a RAID controller and there are two disks > connected to some other controller which might lead > to some interesting phone calls. > Your remote hosting company put a RAID with two > disks in some random machine and someone else > is complaining on some other list about the inverse > of your problem. > Also what type of RAID? If it's Hardware RAID _and_ it's using a 3ware card, you can install tw_cli from /usr/ports/sysutils. It's a nice little utility and will show you the status of your units/ports/drives and how many drives you have on that controller.
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