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| '''Howto'''
| | *[[Raid]] |
| =Einrichten=
| | *[[Mdadm Grundlagen]] |
| ==Installation==
| | *[[Mdadm Howto]] |
| *apt-get install mdadm
| | *[[Aufgaben zu mdadm]] |
| ==Raid 0==
| |
| *mdadm -C /dev/md0 -l 0 -n 2 /dev/vda5 /dev/vda6
| |
| ==Raid 1==
| |
| *mdadm -C /dev/md1 -l 1 -n 2 /dev/vda7 /dev/vda8
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| ==Raid 5==
| |
| *mdadm -C /dev/md2 -l 5 -n 3 /dev/vda9 /dev/vda10 /dev/vda11
| |
| ==Raid 10==
| |
| *mdadm -C /dev/md3 -l 10 -n 4 /dev/vda12 /dev/vda13 /dev/vda14 /dev/vda15
| |
| ==Mountpoints erzeugen==
| |
| *mkdir /mnt/raid{0,1,5,10}
| |
| ==Dateisystem aufbringen==
| |
| *mkfs.ext4 /dev/md0
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| *mkfs.ext4 /dev/md1
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| *mkfs.ext4 /dev/md2
| |
| *mkfs.ext4 /dev/md3 | |
| =Kontrolle=
| |
| * cat /proc/mdstat
| |
| <pre>
| |
| Personalities : [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
| |
| md3 : active raid10 vda15[3] vda14[2] vda13[1] vda12[0]
| |
| 20953088 blocks super 1.2 512K chunks 2 near-copies [4/4] [UUUU]
| |
| [=============>.......] resync = 68.4% (14344640/20953088) finish=0.5min speed=202328K/sec
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|
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| md2 : active raid5 vda11[3] vda10[1] vda9[0]
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| 20953088 blocks super 1.2 level 5, 512k chunk, algorithm 2 [3/3] [UUU]
| |
|
| |
| md1 : active raid1 vda8[1] vda7[0]
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| 10476544 blocks super 1.2 [2/2] [UU]
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|
| |
| md0 : active raid0 vda6[1] vda5[0]
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| 20953088 blocks super 1.2 512k chunks
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| </pre>
| |
| ==mdadm.conf erstellen==
| |
| */usr/share/mdadm/mkconf > /etc/mdadm/mdadm.conf
| |
| ==alternative==
| |
| (Braucht man nicht, wenn die Konfiguration im persistent superblock ist)
| |
| cd /etc/mdadm
| |
| echo 'DEVICE /dev/hd*[0-9] /dev/sd*[0-9]' > mdadm.conf
| |
| mdadm --detail --scan >> mdadm.conf
| |
| | |
| ==Bootvorgang==
| |
| mdadm -A /dev/md0 /dev/sdb1 /dev/sdc10
| |
| mdadm -A /dev/md1 /dev/sdb2 /dev/sdc2 /dev/sdd2
| |
| | |
| Alternativ kann man die RAID*-Funktionen auch fest in den Kernel einbinden oder die Module in die Ramdisk einbinden,
| |
| dann werden bei 0xFD Partitionstyp die Partitionen automatisch zu md-Devices assembliert und gestartet.
| |
| | |
| ==Partition hinzufügen==
| |
| mdadm /dev/md2 -a /dev/sdc3
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| | |
| ==Partition fehlerhaft setzen==
| |
| mdadm /dev/md2 -f /dev/sdb3
| |
| | |
| ==Partition entfernen==
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| mdadm /dev/md2 -r /dev/sdb3
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| | |
| ==Raid stoppen==
| |
| mdadm -S /dev/md0
| |
| | |
| ==Raid Info==
| |
| mdadm -D /dev/md0
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| /dev/md0:
| |
| Version : 00.90.03
| |
| Creation Time : Wed Apr 15 13:42:42 2009
| |
| Raid Level : raid1
| |
| Array Size : 987840 (964.85 MiB 1011.55 MB)
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| Device Size : 987840 (964.85 MiB 1011.55 MB)
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| Raid Devices : 2
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| Total Devices : 2
| |
| Preferred Minor : 0
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| Persistence : Superblock is persistent
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|
| |
| Update Time : Wed Apr 15 13:59:29 2009
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| State : clean
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| Active Devices : 2
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| Working Devices : 2
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| Failed Devices : 0
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| Spare Devices : 0
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|
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| UUID : 83eeb8b3:5bd709f3:0b079abc:da6fc34e
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| Events : 0.2
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|
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| Number Major Minor RaidDevice State
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| 0 8 17 0 active sync /dev/sdb1
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| 1 8 33 1 active sync /dev/sdc1
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| | |
| ==Superblock untersuchen==
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| mdadm -E /dev/sdb1
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| /dev/sdb1:
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| Magic : a92b4efc
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| Version : 00.90.03
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| UUID : 83eeb8b3:5bd709f3:0b079abc:da6fc34e
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| Creation Time : Wed Apr 15 13:42:42 2009
| |
| Raid Level : raid1
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| Raid Devices : 2
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| Total Devices : 2
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| Preferred Minor : 0
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|
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| Update Time : Wed Apr 15 13:59:29 2009
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| State : clean
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| Active Devices : 2
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| Working Devices : 2
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| Failed Devices : 0
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| Spare Devices : 0
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| Checksum : 243179c - correct
| |
| Events : 0.2
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|
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|
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| Number Major Minor RaidDevice State
| |
| this 0 8 17 0 active sync /dev/sdb1
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|
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| 0 0 8 17 0 active sync /dev/sdb1
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| 1 1 8 33 1 active sync /dev/sdc1
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| | |
| ==Scanne alle Partitionen und Devices und baue sie zu md0 sofern im Superblock 0 aufgeführt==
| |
| mdadm -Ac partitions -m 0 /dev/md0
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| | |
| ==Scanne alle Partitionen und Devices und baue sie zu md1 sofern im Superblock 1 aufgeführt==
| |
| mdadm -Ac partitions -m 1 /dev/md1
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| | |
| ==Konfiguration updaten==
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| mdadm -Ds > /etc/mdadm.conf
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| ==Superblock löschen==
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| mdadm --zero-superblock /dev/sda11
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| ==Partition anschalten==
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| mdadm --run /dev/sd11
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| | |
| ==Partition schreibbar setzen==
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| mdadm --readwrite /dev/sd11
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| | |
| =Synchronisationsgeschwindigkeit=
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| anzeigen
| |
| cat /proc/sys/dev/raid/speed_limit_max
| |
| 200000
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| cat /proc/sys/dev/raid/speed_limit_min
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| 1000
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| erhöhen
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| echo 50000 > /proc/sys/dev/raid/speed_limit_min
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| | |
| =SATA RAID=
| |
| *https://wiki.debian.org/DebianInstaller/SataRaid
| |