Re: Ahah, 4096 blocksize disk is not recognised under Linux?

From: Geert Uytterhoeven (geert@linux-m68k.org)
Date: Tue Jan 07 2003 - 04:26:42 EST

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On 7 Jan 2003, Kulwant Bhogal wrote:
> > mke2fs /dev/<DEVICE>
>
> Ok, I tried mke2fs dev/sdc because mke2fs /dev/sdc1 kinda obviously didn't
> work because LINUX can't see the partitions. And this is what I got:
>
> # mke2fs /dev/sdc
>
> mke2fs 1.27 (8-Mar-2002)
> /dev/sdc is entire device, not just one partition!
> proceed anyway (y,n) y
> filesystem label=
> OS type LINUX
> Block size = 4096 (log=2)
> Fragment size = 4096 bytes
> 636480 inodes, 1271205 blocks
> 63560 blocks (5.00%) reserved for the super use.
> First data block=0
> 39 block groups (I think that was a 9 - I can't read my own writing!)
> 32768 blocks per group, 32768 fragments per group 16320 inodes per group
> superblock backups stored on blocks:
> 32708, 98304, 163840, 229376, 294912, 819200, 884736
> Warning: Could not read block 0: Attempt to read block from filesystem
> resulted in short read.

Oops...

> Writing inode tables: []1/39
>
> ( [] was basically a black block cursor).
>
> At which point the machine appeared to hang (I left it for several minutes). It would accept a carriage return
> (I would get a new line) but I didn't get the command prompt (#) back - even
> after a Ctrl-C. So I rebooted.
>
> >> > 2. Does Linux recognize the blocksize during disk probing? E.g. for
> >> > my disks it says
> >> > | SCSI device sda: 8910423 512-byte hdwr sectors (4562 MB)
> >> > | SCSI device sdb: 6281856 512-byte hdwr sectors (3216 MB)
> >> > during startup.
> > Use `dmesg | less' or `dmesg | more'.
>
> Here is an excerpt of the relevant bits of the dmesg output:
>
> Total memory 96Mb.
> linux version 2.2.10 (root@pismo)
> (gcc version 2.95.2 20000220
> (Debian GNU/Linux)) #1 Wed Jan 24 00:44:26 CET 2001
> .
> . lots of other output about various other devices and drivers etc - all
> . looked ok.
> .
> SCSI: 1 host
> SCSI0: target 0 accepting period 200ns offset 8 5.00MHz Synchronous SCSI
> SCSI 0: setting target 0 to period 200ns offset 8 5.00MHz synchronous SCSI
>
> Vendor: COMPAQ Model DGHS18Y
> Type: Direct Access Rev 03F1 ANSI SCSI Revision 03
>
> Detected SCSI disk sda at SCSI 0, Channel 0, id 0, lun 0
>
> Vendor: SEAGATE Model ST34573LW
> Type: Direct Access Rev: 6246 ANSI SCSI Revision 02
>
> SCSI device sda: hdwr sector=512 bytes. Sectors=35566000 [17366MB] [17.4GB]
> SCSI Device sdb: hdwr sector = 4096 bytes. Sectors = 1271205 [4964MB][5.0GB]
> SCSI Device sdc: hdwr sector = 4096 bytes. Sectors = 1271205 [4964MB][5.0GB]
> SCSI Device sdd: hdwr sector = 512 bytes. Sectors = 17773524 [8678MB][8.7GB]

So those disks are recognized correctly as having 4096-byte sectors.

> Partition check:
>
> sda: RDSK sda1 sda2 sda3 sda4 sda5 sda6 sda7
>
> sdb: sd.cBad block number/count requestedscsidisk I/O error: dev 08:10,
> sector 0
> unable to read partition table.

Either the SCSI disk driver or the RDSK partition code cannot handle 4096-byte
sectors.

> sdc: sd.cBad block number/count requestedscsidisk I/O error: dev 08:20,
> sector 0
> unable to read partition table.
>
> sdd: RDSK sdd1 sdd2 sdd3 sdd4 sdd5
>
> hda: RDSK hda1 hda2 hda3
>
> EXT2 - fs warning: checktime reached, running e2fsck is recommended.
> VFS: Mounted root (ext2 filesystem)
>
> CFS: Disk change detected on device sr(11,0)
> attempt to access beyond end of device
> 0b:00: rw=0, want=33, limit=2
> isofs_read_super: bread failed,
> dev=ob:00, iso_blknum=16. block=32
> sd.cBad block number/count requestedscsidisk I/O error: dev 08:10,
> sector 0
> sdc: sd.cBad block number/count requestedscsidisk I/O error: dev 08:20,
> sector 0
> unable to read partition table.
>
>
> I did run e2fsck on dev/sdc and I basically got the same sort of error about
> sector 0, short read and the partition being "zero length?" etc.

So the driver doesn't seem to handle 4K sectors. Anyone on lkml who has a
definitive answer about that?

> > The partitions look fine (cfr. your other email). So having Linux and
> > Amiga partitions shared on the 18 GB disk should work fine.
>
> Should? That doesn't sound like 100%. I I think I will try the 420Mb Connor
> first, now that I have the data from it backed up. Something makes me
> slightly uneasy about sharing AmigaOS native and foreign partitions on the same disk
> especially when the disk is >4Gb which in itself requires OS patches to get it
> recognised and working. Just being cautious :-).

I've had them living on one disk for many many years. But I have to admit all
my disks are < 4 GB.

> I included the bits about the speeds because on the Amiga side, my drives
> accept 10MHz synchronous. Why does LINUX manage only 5MHz? Does this get
> better with a proper installation?

I don't know.

Gr{oetje,eeting}s,

Geert

-- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds

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