oopscheck and RAID1

[anup123]

RAID1 setup (dual cpu/2gigram) RH9
oopscheck gives no warning
smartctl indicates one disk dying.
So replacing one disk after RAID rsync completes. Dying disk confirmed by DC.

Just thought to post this that sometimes "Automation" has to be overriden by manual regular checks. if you are on RAID1, beware ... all those default smartctl or /scripts/smartcheck does show nothing. Use the latest smartctl as the default one could be misleading.

Maybe something very specific to my setup, but just sharing my thoughts.

Anup

 

[radical]

how do i confirm if Raid1 is installed

hi

since you already have raid1 configured on your server, needed your help here. I have a new server from my DC, which was initially supposed to have 2X120GBIDE , but they have say that they have now given 2X160GB scsi drives due to non-availability of 120gb drives, and say that raid1 is configured. in whm, the physical disks (under server info) show only 1 drive. i run Centos3.4 with Cpanel/WHM latest.

Physcial Disks
hdc: SAMSUNG SP1604N, ATA DISK drive
hdc: max request size: 1024KiB
hdc: 312581808 sectors (160041 MB) w/2048KiB Cache, CHS=19457/255/63, UDMA(100)
hdc: cache flushes supported

the filesystem shows 8 partitions of sda1 to sda8. how do i confirm if raid is actually installed

thanks
Sunny

 

[gorilla]

according to this tutorial http://www.linux.org/docs/ldp/howto/Boot+Root+Raid+LILO-3.html

The geometry information for the drive can be obtained from fdisk with the command:


fdisk -ul (little L)
fdisk -ul /dev/hda

and it should look something like this:

Disk /dev/hda: 16 heads, 63 sectors, 39770 cylinders
Units = sectors of 1 * 512 bytes

Device Boot Start End Blocks Id System
/dev/hda1 63 33263 16600+ fd Linux raid autodetect
/dev/hda2 33264 443519 205128 82 Linux swap
/dev/hda3 443520 40088159 19822320 fd Linux raid autodetect

 

[radical]

need a bit more help here

sorry i am a bit of a linux newbie, so what exactly should i use in the command. my file system shows /dev/sda1 - should i run fdisk -ul /dev/sda ? sorry if i sound dumb
my confusion is that the physical disk in WHM is shown as- hdc: SAMSUNG SP1604N, ATA DISK drive. but in the /var/log/dmesg i get only one drive /dev/sda. The actual config of the server which i had requested for was 2X120GB IDE Raid1 with a third HDD IDE of 60GB for backup's. i really want to be sure what my server really has, before getting back to my DC for not giving me the server i ordered. any help will be really appreciated.

thanks
Sunny

according to this tutorial http://www.linux.org/docs/ldp/howto/Boot+Root+Raid+LILO-3.html

The geometry information for the drive can be obtained from fdisk with the command:


fdisk -ul (little L)
fdisk -ul /dev/hda

and it should look something like this:

Disk /dev/hda: 16 heads, 63 sectors, 39770 cylinders
Units = sectors of 1 * 512 bytes

Device Boot Start End Blocks Id System
/dev/hda1 63 33263 16600+ fd Linux raid autodetect
/dev/hda2 33264 443519 205128 82 Linux swap
/dev/hda3 443520 40088159 19822320 fd Linux raid autodetect

 

[gorilla]

Hi radical, yes just run fdisk -ul and see what the info is

 

[anup123]

cat /proc/mdstat should give information about RAID setup i think.
WHM *should* show all the disks.

 

[gorilla]

In WHM wouldnt it just appear as one drive if its raid1 ( mirrored) ?

 

[anup123]

It doesn't in my case. All drives are shown.
cat /proc/mdstat shows the RAID details...

cat /proc/mdstat ::
Personalities : [raid1]
md1 : active raid1 hdc3[0] hda3[1]
78678272 blocks [2/2] [UU]

md0 : active raid1 hdc1[0] hda1[1]
305088 blocks [2/2] [UU]

unused devices: <none>

WHM Server Status > Server Information > Physical disks:

Shows all the drives


Regards
Anup

 

[gorilla]

hmm interesting regarding the WHM info.

BTW have you ever setup a raid10 system ( which is mirrored and striped across 4 drives)
Been thinking of satisfying my hardware obsession and building another monster

 

[anup123]

Nope, Next i am planning is RAID5.
More about RAID ... good summary treatment:

http://www.acnc.com/04_00.html

for different RAID levels.

Regards
Anup

 

[Kerstin]

RAID5 are only aivailable for SCISI drives ?
RAID5 controller needed.
The controller splitting datas with a intelligent
algorythm to maybe 5 drives.
When one drive crashed, all datas can be aesy restored
when the drive replaced.