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munir

Scsi Hard Drives (Configured In Raid1 )

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Assalamuaalikum..

Maaf saya post disini walaupun persoalan adalah base pd HDD hardware tetapi ada related dgn OS

Actualy member saya ada run [b]os centos5[/b]

Pyshicall HDD - [b]2 x 73GB 10K RPM SCSI hard drives (configured in RAID1 )[/b]

Tetapi bila view dalam webmin - [b]Local disk space 62.48 GB total, 21.91 GB used[/b]

Persoalan saya kenapa dalam webmin hanya view 62.48 GB as Total sedangkan actual [b]73GB x 2[/b]. sekarang seolah hanya ada 1 HDD sahaja.

adakah sebab Raid ?

Harap tolong beri penjelasan ok

Terima kasih Edited by munir

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[quote name='munir' date='24 February 2010 - 12:52 AM' timestamp='1266943965' post='1018558']
Assalamuaalikum..

Maaf saya post disini walaupun persoalan adalah base pd HDD hardware tetapi ada related dgn OS

Actualy member saya ada run [b]os centos5[/b]

Pyshicall HDD - [b]2 x 73GB 10K RPM SCSI hard drives (configured in RAID1 )[/b]

Tetapi bila view dalam webmin - [b]Local disk space 62.48 GB total, 21.91 GB used[/b]

Persoalan saya kenapa dalam webmin hanya view 62.48 GB as Total sedangkan actual [b]73GB x 2[/b]. sekarang seolah hanya ada 1 HDD sahaja.

adakah sebab Raid ?

Harap tolong beri penjelasan ok

Terima kasih
[/quote]


salam..

as far as yg saya tau, kalau RAID 1, 1 HDD jalan dan satu lg mirror, so kalau pun 2 X 73Gb, hanya akan tertera 1 HDD saja.. shortage dan tak sepenuhnya 73Gb tu mungkin pasal masa installation dan formatting data, akan kecil sedikit dari hdd asal..

http://en.wikipedia.org/wiki/RAID

[img]http://www.prepressure.com/images/raid1.gif[/img]
[img]http://www.pantherproducts.co.uk/Articles/images/RAID-1.gif[/img]

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hi Munir,

kalau raid tu ialah software raid, kau buleh check kat /proc/mdstat. contoh command : cat /proc/mdstat , tapi kalau hardware raid selalunya vendor hardware tu ada bagi raid utility untuk manage raid system tu.

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[quote name='bigbird' date='25 February 2010 - 12:03 PM' timestamp='1267070596' post='1018919']
hi Munir,

kalau raid tu ialah software raid, kau buleh check kat /proc/mdstat. contoh command : cat /proc/mdstat , tapi kalau hardware raid selalunya vendor hardware tu ada bagi raid utility untuk manage raid system tu.
[/quote]

ooo gitu terima kasih abg bigbird,kalau dia keluar mcm ini..

[root@my ~]# /proc/mdstat
-bash: /proc/mdstat: Permission denied
[root@my ~]# cat /proc/mdstat
Personalities :
unused devices: <none>
[root@my ~]#

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[quote name='bigbird' date='25 February 2010 - 08:05 PM' timestamp='1267099529' post='1019014']
cuba kau check berapa hdd yg os kau detect dgn mengunakan command fdisk -l . apa hardware kau pakai? cuba check hardware manual server tu.
[/quote]
[root@my ~]# fdisk -l

Disk /dev/sda: 73.5 GB, 73508513792 bytes
255 heads, 63 sectors/track, 8936 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/sda1 * 1 13 104391 83 Linux
/dev/sda2 14 8936 71673997+ 8e Linux LVM

Disk /dev/sdb: 73.5 GB, 73508513792 bytes
255 heads, 63 sectors/track, 8936 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/sdb1 * 1 13 104391 83 Linux
/dev/sdb2 14 8936 71673997+ 8e Linux LVM
[root@my ~]#

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dua dua disk nampak identical ada kemungkinan raid, cuba run command ni lak lvmdiskscan harap2 nampak raid logical device. kalau kat server yg biasa aku access raid logical devices nampak macam ni /dev/cciss/c0d0p* (hp disk array). untuk tengok apa hardware yang attached dgn server ni tgk kat /etc/sysconfig/hwconf .

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[quote name='bigbird' date='25 February 2010 - 10:32 PM' timestamp='1267108329' post='1019065']
dua dua disk nampak identical ada kemungkinan raid, cuba run command ni lak lvmdiskscan harap2 nampak raid logical device. kalau kat server yg biasa aku access raid logical devices nampak macam ni /dev/cciss/c0d0p* (hp disk array). untuk tengok apa hardware yang attached dgn server ni tgk kat /etc/sysconfig/hwconf .
[/quote]

jadi mmg comfirm 2 disk yer..sebab kita sewa kt org box nih..

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Salam,

Kalau HD configure guna RAID 1 (dua HD diperlukan sama saiz) - katakan 73GB x 2 maka saiz hard disk usable adalah 73GB kerana RAID 1 buat mirror pada dua-dua hardisk untuk fail safe in case mana-mana HD corrupt.

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