Dotaz: Kernel 2.6.27.7 nepozna RAID pole vetsi jak 2TB ?

[svaca]

Ahoj, mam SATA HW RAID radic od 3Ware a pole ma 2.21TB, kernel ale v dmesg hlasi tuhle hlasku:

kernel: sd 2:0:0:0: [sdb] Very big device. Trying to use READ CAPACITY(16).

A ja nicim nemuzu precist to /dev/sdb abych to rozpartisnoval .. Nevite, kde muze byt chyba ? Diky ...

Odpovědi

[Andrej Herceg]

Nie je to chyba, je to len upozornenie, že sa musela použiť iná verzia príkazu READ CAPACITY (chyba bude pravdepodobne až ďalej).

[svaca]

jenze dale uz zadna chyba neni, pak je klasicky vypis, kde je vypsana kapacita v MB a ta sedi ... Takze to vypada OK, ale cfdisk, fdisk ani parted si s tim neporadi ...

[Skokan, Pavel]

to by mohl byt hranicni pripad cislo sest na www.harryho.info/hdd_teorie.htm

[svaca]

vypada to tak .. vzdal jsem to a udelal jsem pole 1.81TB to jede naprosto nosmalne ... Ma to byt NAS server na Slackware s iSCSI, takze nebudu experimentovat ....

Zajimavy limit v dnesni dobe

Svaca

[Skokan, Pavel]

nicmene by melo byt mozne vyuzit celou kapacitu pole za predpoladu pouziti GPT viz.:

ubuntuforums.org/archive/index.php/t-901368.html

nejsem si jisty, ze z toho lze bootovat, ale pokud by byl na system pouzit jiny disk, tak je to jedno...

(mam ubuntu, ale nemam tak velke pole, takze to nemam odzkousene )

[oxymoron]

neexistuje, kernel s tym nemoze mat problem (v dnesnej dobe keby ho mal tak je to velka hanba) , jediny problem je partiton > 2TB ale kto by to robil ....

treba na to dat LVMko ako v mojom pripade a je to.

Vypis mojho pola o velkosti 6TB

sd 0:2:0:0: [sda] Attached SCSI disk                                                                                                                         
[   78.312125] sd 1:2:0:0: [sdb] Very big device. Trying to use READ CAPACITY(16).                                                                                          
[   78.312160] sd 1:2:0:0: [sdb] 11714691072 512-byte hardware sectors (5997922 MB)                                                                                         
[   78.312201] sd 1:2:0:0: [sdb] Write Protect is off                                                                                                                       
[   78.312208] sd 1:2:0:0: [sdb] Mode Sense: 1f 00 00 08                                                                                                                    
[   78.312271] sd 1:2:0:0: [sdb] Write cache: enabled, read cache: disabled, doesn't support DPO or FUA                                                                     
[   78.312384] sd 1:2:0:0: [sdb] Very big device. Trying to use READ CAPACITY(16).                                                                                          
[   78.312417] sd 1:2:0:0: [sdb] 11714691072 512-byte hardware sectors (5997922 MB)                                                                                         
[   78.312460] sd 1:2:0:0: [sdb] Write Protect is off                                                                                                                       
[   78.312461] sd 1:2:0:0: [sdb] Mode Sense: 1f 00 00 08                                                                                                                    
[   78.312530] sd 1:2:0:0: [sdb] Write cache: enabled, read cache: disabled, doesn't support DPO or FUA                                                                     
[   78.312534]  sdb: unknown partition table                                                                                                                                
[   78.323042] sd 1:2:0:0: [sdb] Attached SCSI disk

[Jooky (inactive)]

Uz pri citani otazky ma napadla tato volba v jadre

*
* Enable the block layer
*
Enable the block layer (BLOCK) [Y/?] (NEW) y
  Support for Large Block Devices (LBD) [N/y/?] ?

Enable block devices of size 2TB and larger.

This option is required to support the full capacity of large
(2TB+) block devices, including RAID, disk, Network Block Device,
Logical Volume Manager (LVM) and loopback.

For example, RAID devices are frequently bigger than the capacity
of the largest individual hard drive.

This option is not required if you have individual disk drives
which total 2TB+ and you are not aggregating the capacity into
a large block device (e.g. using RAID or LVM).

If unsure, say N.

Ja tiez pouzivam 2TB+ luny (ci uz raidu, alebo cez SAN) a aj na starsich jadrach bez problemov. To ze to ma byt zapnute snad uz nemusim hovorit :o)

[svaca]

Aha uz to vidim

V tom bude ten zakopany pes ... Respektive, tohle mam ZAPLE, ale dale je funkce:

[ ] Block layer SG support v4 (EXPERIMENTAL)

a tu zaplou nemam ... Ten disk je SATA, tedy vlastne scsi ... vyzkousim ..

[oxymoron]

Tak som trochu googlil a

32bit system:

• maximalna velkost disku (block device) = 16TB
• maximalna velkost ext3 = 16TB pri 4K block size

 

64bit system:

• maximalna velkost disku (block device) = 8EB
• maximalna velkost ext3 = 32TB

 

dalsie filesystemy pripadne mozno niekto doplni :)