hi
i'm assumuming you mean software raid?
personally, i do it per-partition.
you'll have to re-partition if you want
to do this. its mostly because software
raid needs a partition type of FD
(linux raid). You'll first backup a partition,
create the md's,mkfs and put the backup back
into the filesystem. if you dont have a
partition yet for those directories you
want to raid, its not as bad but essentially
the same amount of work (assuming you still
have free space on the disk).
Putting the /boot on RAID-1 at this point
is difficult. that is already
the ROOT RAID and it was easier if you
did that during install..its possible at
this point to convert that to raid, but
you already have /etc and /boot existing
and it would just be a headache to re config
those at this point.
we have a server with a setup similar
to yours (2x xeon, 2x scsi). we did no put
everything on both disks, as some partitions
are replaceable (such as /usr). here is what
we have:
---------------------------------------------
[EMAIL PROTECTED] root]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda5 1008M 239M 718M 25% /
/dev/sda1 124M 33M 84M 28% /boot
/dev/sdb2 1008M 618M 339M 65% /cache
none 503M 0 503M 0% /dev/shm
/dev/sdb1 2.0G 35M 1.8G 2% /tmp
/dev/sda2 4.9G 3.3G 1.4G 69% /usr
/dev/sdb5 985M 803M 132M 86% /misc
/dev/md0 25G 1.3G 22G 6% /var
/dev/md1 985M 24M 911M 3% /log
[EMAIL PROTECTED] root]# cat /proc/mdstat
Personalities : [raid1]
read_ahead 1024 sectors
md0 : active raid1 sdb6[1] sda6[0]
26624896 blocks [2/2] [UU]
md1 : active raid1 sdb7[1] sda7[0]
1024896 blocks [2/2] [UU]
unused devices: <none>
[EMAIL PROTECTED] root]#
------------------------------------
we place too much importance on /var as you can
tell. The rest we dont really care about --
/boot, /usr and so on I can just re install
from the redhat CD's. so we have a situation
where the OS boots on one disk, scatter the
filesystems /boot, /usr, swap, etc..
on both, and put the /var on both of them.
here's another server of mine. This one is
more interesting. This one has 2 ide disks:
-------------------------------------------
hagibis[2]% df -h
Filesystem Size Used Avail Use% Mounted on
/dev/hde5 787M 258M 489M 35% /
/dev/hde1 68M 26M 39M 40% /boot
none 251M 0 250M 0% /dev/shm
/dev/hde6 1.4G 18M 1.3G 2% /tmp
/dev/hde7 4.3G 3.4G 790M 82% /usr
/dev/md0 988M 301M 637M 33% /var
/dev/md1 988M 301M 637M 33% /log
/dev/md2 1.9G 240M 1.5G 13% /home
/dev/md3 1.9G 320M 1.5G 18% /www
/dev/md4 14G 4.6G 9.1G 34% /pictures
/dev/md5 9.9G 5.3G 4.2G 56% /windump
/dev/hdg10 19G 733M 17G 4% /misc
/dev/hdg11 19G 800M 17G 5% /picimage
/dev/hdg12 387M 339M 28M 93% /webcache
/dev/hdg13 4.3G 2.9G 1.1G 72% /tgadump
hagibis[3]%
----------------------------------------------------
so several partitions are being shared
(the md? partitions) on 2 disks, the others
distributed on non-raid (I dont care about
them, as I'm willing to reconstruct them
if they dissapear).
i havent played around much with webmin but
i suspect it just lets you see the status
hot mount and unmount disks, but not construct
a new one (since that involves partitioning).
HTH
jondz
On Sun, 2003-08-10 at 05:51, Charles Nierva wrote:
> I have a RH7.3 server with specs:
> • Dual Intel Xeon™ processors
> • 2GB PC2100 DDR RAM with ECC
> • Dual channel Ultra320 SCSI controller
> • Adaptec AIC-7902 64bit, PCI-X SCSI controller
> • 1 x 36 GB SCSI HDD
> • 1 x 72 GB SCSI HDD
>
> My /, /boot, /var, /home, /usr ,/cache, and swap
> partitions is in the 36 GB SCSI HDD..
>
> My questions:
>
> 1. Can I implement RAID-1 in this specifications? I
> mean, can i mirror the whole system to the second SCSI
> HDD so that if ever the 36 GB SCSI HDD breaks down,
> the second SCSI HDD will be used as my system?
>
> 2. I installed webmin. In webmin's hardware category
> there's Linux raid.. is this safe to use to implement
> RAID-1 in my system? Will it destroy or touch some
> configs in my system in the 36GB SCSI HDD?
>
> 3. Any suggestions?
>
> Hope i gave all infos and details correctly..
> TIA..
>
>
>
> =====
> ==========
> Charles Nierva
> Davao City, Philippines
> Registered Linux User #279469
>
> __________________________________
> Do you Yahoo!?
> Yahoo! SiteBuilder - Free, easy-to-use web site design software
> http://sitebuilder.yahoo.com
> --
> Philippine Linux Users' Group (PLUG) Mailing List
> [EMAIL PROTECTED] (#PLUG @ irc.free.net.ph)
> Official Website: http://plug.linux.org.ph
> Searchable Archives: http://marc.free.net.ph
> .
> To leave, go to http://lists.q-linux.com/mailman/listinfo/plug
> .
> Are you a Linux newbie? To join the newbie list, go to
> http://lists.q-linux.com/mailman/listinfo/ph-linux-newbie
--
JondZ <[EMAIL PROTECTED]>
--
Philippine Linux Users' Group (PLUG) Mailing List
[EMAIL PROTECTED] (#PLUG @ irc.free.net.ph)
Official Website: http://plug.linux.org.ph
Searchable Archives: http://marc.free.net.ph
.
To leave, go to http://lists.q-linux.com/mailman/listinfo/plug
.
Are you a Linux newbie? To join the newbie list, go to
http://lists.q-linux.com/mailman/listinfo/ph-linux-newbie
