RAID server check (R

hard raid VS soft raid :

there is no much merit in build soft raid on production enviroment

it is very rare for enterprise to use soft raid. it will cosumet cpu resource.

softraid is base on partitions.

command> mdadm

OS /boot should not put in raid devices.

step:

1. create partition of type0xfd (Linux RAID Autedetect)

2.

## getting MRB from sda

dd if=/dev/sda of=/mbr bs=1 count=446

#file /mbr

## move /mbr to second drive dd if=/mbr of=/dev/sdb bs=1 count=446 #dd is base on block . ## p_w_picpath create dd if=/dev/cdrom of=/dvd.iso  clone p_w_picpath of cd. can use cp to make p_w_picpath: cp /dev/cdrom /dvd.iso ## full clone of hard disk dd if=/dev/sda of=/dev/sdb  

# dmideco |more

Handle 0x0000         DMI type 0, 19 bytes.         BIOS Information                 Vendor: IBM                 Version: -[GRE155AUS-1.14]-                 Release Date: 10/26/2004                 Address: 0xF0A80                 Runtime Size: 62848 bytes                 ROM Size: 4096 kB                 Characteristics:                         PCI is supported                         BIOS is upgradeable                         BIOS shadowing is allowed                         Boot from CD is supported                         Selectable boot is supported                         Japanese floppy for NEC 9800 1.2 MB is supported (int 13 h)                         Japanese floppy for Toshiba 1.2 MB is supported (int 13h

 5.25"/360 KB floppy services are supported (int 13h)                         5.25"/1.2 MB floppy services are supported (int 13h)                         3.5"/720 KB floppy services are supported (int 13h)                         3.5"/2.88 MB floppy services are supported (int 13h)                         Print screen service is supported (int 5h)                         8042 keyboard services are supported (int 9h)                         Serial services are supported (int 14h)                         Printer services are supported (int 17h)                         CGA/mono video services are supported (int 10h)                         ACPI is supported                         USB legacy is supported                         I2O boot is supported                         LS-120 boot is supported Handle 0x0001         DMI type 1, 25 bytes.         System Information                 Manufacturer: IBM                 Product Name: eserver xSeries 235 -[86712AX]-                 Version: Not Specified                 Serial Number: 99C3974                 UUID: 6E6F9A4E-E51D-B211-8484-90F4D0F3FF02 # uname -r  for OS version

# lspci -vt

-+-[05]-+-03.0  IBM ServeRAID Controller  |      +-07.0  LSI Logic / Symbios Logic 53c1030 PCI-X Fusion-MPT Dual Ultra320 SCSI  |      \-07.1  LSI Logic / Symbios Logic 53c1030 PCI-X Fusion-MPT Dual Ultra320 SCSI  +-[02]-+-01.0  Adaptec AIC-7892A U160/m  |      \-08.0  Broadcom Corporation NetXtreme BCM5703X Gigabit Ethernet  \-[00]-+-00.0  Broadcom CMIC-WS Host Bridge (GC-LE chipset)         +-00.1  Broadcom CMIC-WS Host Bridge (GC-LE chipset)         +-00.2  Broadcom CMIC-LE         +-09.0  ATI Technologies Inc Rage XL         +-0f.0  Broadcom CSB5 South Bridge         +-0f.1  Broadcom CSB5 IDE Controller         +-0f.2  Broadcom OSB4/CSB5 OHCI USB Controller         +-0f.3  Broadcom CSB5 LPC bridge         +-10.0  Broadcom CIOB-X2 PCI-X I/O Bridge         +-10.2  Broadcom CIOB-X2 PCI-X I/O Bridge         +-11.0  Broadcom CIOB-X2 PCI-X I/O Bridge         \-11.2  Broadcom CIOB-X2 PCI-X I/O Bridge # cat /proc/scsi/scsi

Attached devices: Host: scsi3 Channel: 00 Id: 00 Lun: 00   Vendor: IBM      Model: SERVERAID        Rev: 1.00   Type:   Direct-Access                    ANSI SCSI revision: 02 Host: scsi3 Channel: 00 Id: 01 Lun: 00   Vendor: IBM      Model: SERVERAID        Rev: 1.00   Type:   Direct-Access                    ANSI SCSI revision: 02 Host: scsi3 Channel: 00 Id: 02 Lun: 00   Vendor: IBM      Model: SERVERAID        Rev: 1.00   Type:   Direct-Access                    ANSI SCSI revision: 02 Host: scsi3 Channel: 00 Id: 15 Lun: 00   Vendor: IBM      Model: SERVERAID        Rev: 1.00   Type:   Processor                        ANSI SCSI revision: 02 Host: scsi3 Channel: 01 Id: 09 Lun: 00   Vendor: IBM      Model: 25P3471a S320  2 Rev: 1   Type:   Processor                        ANSI SCSI revision: 02 Host: scsi3 Channel: 02 Id: 08 Lun: 00   Vendor: IBM      Model: 32P0042a S320  1 Rev: 1   Type:   Processor                        ANSI SCSI revision: 02  # dmesg|grep -i attach Attached scsi disk sda at scsi3, channel 0, id 0, lun 0 Attached scsi disk sdb at scsi3, channel 0, id 1, lun 0 Attached scsi disk sdc at scsi3, channel 0, id 2, lun 0 Attached scsi generic sg3 at scsi3, channel 0, id 15, lun 0,  type 3 Attached scsi generic sg4 at scsi3, channel 1, id 9, lun 0,  type 3 Attached scsi generic sg5 at scsi3, channel 2, id 8, lun 0,  type 3 # df

Filesystem           1K-blocks      Used Available Use% Mounted on /dev/sda5              1945124    643612   1202704  35% / /dev/sda1               147186     81038     58549  59% /boot /dev/sda7               976468    181668    745196  20% /home none                   1282872         0   1282872   0% /dev/shm /dev/sda6               976468     27876    898988   4% /tmp /dev/sda2              8938540   3262376   5222108  39% /usr /dev/sda3              1945156   1787384     58960  97% /var /dev/sdb1            228386892  15414032 201371412   8% /home/bcs/bcs /dev/sdc1            141120020  42613492  91338036  32% /home/bcs/users_back /dev/sdb2             53851168     32828  51082800   1% /home/bcs/users