On Wed, 31 Jan 2001, Alex Shnitman wrote:
> Now that Linux 2.4.1 is out, with supposedly good LVM and ResierFS
> support, I think we should upgrade our server to run it. Then we'll be
> able to straighten out the mirrors situation.
2.4 itself appears to be stable, from what i've heard/seen. it's also not
very problematic to install it on a redhat 6.2 system.
> Right now we don't mirror GNU; we don't mirror any Debian
> architectures besides i386 (which is one of the reasons for us not
> being able to get official mirror status); we don't mirror much of the
> Red Hat archive (including the beta section, which may interest many
> people, and other sections as well); we don't mirror Mandrake-devel;
> and we're slowly running out of diskspace despite all that.
>
> With 2.4.1, we'll be able to take the new disks (for which I hope the
> kind Aduva offer still stands), create an LVM volume on them, format
> it with ReiserFS, copy the current mirror to it, and then add the old
> disks to the volume to regain that space too.
it's also possible to set up two seperate logical partitions. one'll
remain the old one, one as the new one.
> We won't have RAID 5 in that case, but I think we can manage without
> RAID 5, because the data on the mirrors is not very important
> (i.e. it's not original data, and can be re-created in the worst
> case). LVM should allow us to take a disk out of the volume without
> destroying the filesystem, which is what we'll do if a disk starts
> failing. (If the disk is totally dead it will be more problematic;
> perhaps we should test it somehow?)
the data is not criticla. however, if a single disk fails, we need to
re-get ALL of the mirrored data from scratch - which is a painfull (and
long...) task, when dealing with over 100GB of disk space...
is there a way to add a new disk to an existing RAID-ed file system, in a
similar manner to how you describe this with LVM?
> To summarize, the order of actions is thus:
> OmerM or someone else -- update the box to 2.4.1; for that you'd
> probably need new modutils,
more then that. also new version of rpm, and a few other packages. also,
firewalling'll be changed to use iptables instead of ipchains (it's
possible to compile backward-compatible support for ipchains, but probably
not a great ideal. moving from ipchains to iptables is not very hard -
the commands for filtering remain almost the same).
> We all (I can be the broker) -- contact Aduva and get the disks to our
> hands,
consider yourself nominated ;)
> Someone in close proximity to the server (Guy?) -- get there, install
> the new disks, and do the copy procedure.
no problem with that part. just make sure all those hard disks are somehow
placed in a single array, rather as several seperate boxes (i assume for a
set of external hard drives plus a new SCSI controller - the existing
controller(s) already support a few disks. having more disks will make
internal-machine copy operations work faster, i guess.
--
guy
"For world domination - press 1,
or dial 0, and please hold, for the creator." -- nob o. dy
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