Two Reiser4 FSs in the same HDD cause head seek panic?

Two Reiser4 FSs in the same HDD cause head seek panic?

[Georgios Tsalikis]

I happened to format a rootfs partition and another one for /home with 
Reiser4. It proved to be a disaster. Apart from the slow boot times 
(expected from this drive) even after reaching a functional GUI the 
disk kept doing I/O  like crazy. When /home became Btrfs the issue 
ceased. My other computer that uses an entire drive formatted with 
Reiser4 is nice and silent as well.

Re: Two Reiser4 FSs in the same HDD cause head seek panic?

[doiggl]

On Tue, 24 May 2016 11:58:53 +0300, Georgios Tsalikis
<georgios@tsalikis.net> wrote:
> I happened to format a rootfs partition and another one for /home with 
> Reiser4. It proved to be a disaster. Apart from the slow boot times 
> (expected from this drive) even after reaching a functional GUI the 
> disk kept doing I/O  like crazy. When /home became Btrfs the issue 
> ceased. My other computer that uses an entire drive formatted with 
> Reiser4 is nice and silent as well.
> 
Hello,
As far as I know you have to boot with a Reiser4 enabled kernel to read
reiser4 filesystem.
--Glenn

# lsmod |grep -i reiser4
Module                  Size  Used by
reiser4               442368  0

# cat /proc/filesystems  |grep -i reiser4 |sort
        reiser4

--Glenn

Re: Two Reiser4 FSs in the same HDD cause head seek panic?

[Georgios Tsalikis]

On 25/05/2016 01:22 μμ, doiggl@velocitynet.com.au wrote:
> On Tue, 24 May 2016 11:58:53 +0300, Georgios Tsalikis
> <georgios@tsalikis.net> wrote:
>> I happened to format a rootfs partition and another one for /home with
>> Reiser4. It proved to be a disaster. Apart from the slow boot times
>> (expected from this drive) even after reaching a functional GUI the
>> disk kept doing I/O  like crazy. When /home became Btrfs the issue
>> ceased. My other computer that uses an entire drive formatted with
>> Reiser4 is nice and silent as well.
>>
> Hello,
> As far as I know you have to boot with a Reiser4 enabled kernel to read
> reiser4 filesystem.
> --Glenn
>
> # lsmod |grep -i reiser4
> Module                  Size  Used by
> reiser4               442368  0
>
> # cat /proc/filesystems  |grep -i reiser4 |sort
>          reiser4
>
> --Glenn
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>
It is implied that my kernel is patched and both / and /home were 
mounted as Reiser4

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Re: Two Reiser4 FSs in the same HDD cause head seek panic?

[doiggl]

On Thu, 26 May 2016 03:15:55 +0300, Georgios Tsalikis
<georgios@tsalikis.net> wrote:
> On 25/05/2016 01:22 μμ, doiggl@velocitynet.com.au wrote:
>> On Tue, 24 May 2016 11:58:53 +0300, Georgios Tsalikis
>> <georgios@tsalikis.net> wrote:
>>> I happened to format a rootfs partition and another one for /home with
>>> Reiser4. It proved to be a disaster. Apart from the slow boot times
>>> (expected from this drive) even after reaching a functional GUI the
>>> disk kept doing I/O  like crazy. When /home became Btrfs the issue
>>> ceased. My other computer that uses an entire drive formatted with
>>> Reiser4 is nice and silent as well.

Hello,
What do following commands show ?
--Glenn

example:

# which fsck.reiser4 
/usr/sbin/fsck.reiser4

# fdisk -l

Disk /dev/sdb: 2000.4 GB, 2000398934016 bytes, 3907029168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes

# fsck.reiser4 -V
fsck.reiser4 1.0.6
Copyright (C) 2001-2005 by Hans Reiser, licensing governed by
reiser4progs/COPYING. 


# fsck.reiser4 --print-profile /dev/sdb
Default profile:
create:          "reg40"           (id:0x0 type:0x0)    [Regular file
plugin for creat(2)]
key:             "key_large"       (id:0x1 type:0xb)    [Key plugin]
compress:        "lzo1"            (id:0x0 type:0xc)    [Compression
plugin]
compressMode:    "conv"            (id:0x4 type:0xd)    [Compression Mode
plugin]
cluster:         "64K"             (id:0x0 type:0x10)   [Cluster plugin]
hash:            "r5_hash"         (id:0x1 type:0x3)    [Directory entry
hash plugin]
fibration:       "ext_1_fibre"     (id:0x2 type:0x4)    [Key fibration
plugin]
formatting:      "smart"           (id:0x2 type:0x5)    [File body
formatting plugin]

# fsck.reiser4 --print-plugins  /dev/sdb
Known plugins:
"reg40"             (id:0x0 type:0x0) [Unix-file regular file plugin.]
"dir40"             (id:0x1 type:0x0) [Directory file plugin.]
"sym40"             (id:0x2 type:0x0) [Symlink file plugin.]
"spl40"             (id:0x3 type:0x0) [Special file plugin.]
"ccreg40"           (id:0x4 type:0x0) [Cryptcompress regular file plugin.]
"stat40"            (id:0x0 type:0x1) [StatData item plugin.]
"cde40"             (id:0x2 type:0x1) [Compound directory entry item
plugin.]
"nodeptr40"         (id:0x3 type:0x1) [Node pointer item plugin.]
"extent40"          (id:0x5 type:0x1) [Extent file body item plugin.]
"plain40"           (id:0x6 type:0x1) [Plain file body item plugin.]
"ctail40"           (id:0x7 type:0x1) [Compressed file body item plugin.]
"bbox40"            (id:0x8 type:0x1) [Safe link item plugin.]
"node40"            (id:0x0 type:0x2) [Node plugin.]
"rupasov_hash"      (id:0x0 type:0x3) [Rupasov hash plugin.]
"r5_hash"           (id:0x1 type:0x3) [R5 hash plugin.]
"tea_hash"          (id:0x2 type:0x3) [Tea hash plugin.]
"fnv1_hash"         (id:0x3 type:0x3) [Fnv1 hash plugin.]
"deg_hash"          (id:0x4 type:0x3) [Degenerate hash plugin.]
"lexic_fibre"       (id:0x0 type:0x4) [Lexicographic fibration plugin.]
"dot_o_fibre"       (id:0x1 type:0x4) ['.o' fibration plugin.]
"ext_1_fibre"       (id:0x2 type:0x4) [1-symbol extention fibration
plugin.]
"ext_3_fibre"       (id:0x3 type:0x4) [3-symbol extention fibration
plugin.]
"extents"           (id:0x0 type:0x5) ['Extents only' tail policy plugin.]
"tails"             (id:0x1 type:0x5) ['Tails only' tail policy plugin.]
"smart"             (id:0x2 type:0x5) [Smart tail policy plugin.]
"sdext_lw"          (id:0x0 type:0x6) [Light stat data extension plugin.]
"sdext_unix"        (id:0x1 type:0x6) [Unix stat data extension plugin.]
"sdext_lt"          (id:0x2 type:0x6) [Large times stat data extension
plugin.]
"sdext_symlink"     (id:0x3 type:0x6) [Symlink stat data extension
plugin.]
"sdext_plugin_set"  (id:0x4 type:0x6) [Plugin Set StatData extension
plugin.]
"sdext_flags"       (id:0x5 type:0x6) [Inode flags stat data extension
plugin.]
"sdext_crypto"      (id:0x7 type:0x6) [Crypto stat data extension plugin.]
"sdext_heir_set"    (id:0x8 type:0x6) [Heir Set StatData extension
plugin.]
"format40"          (id:0x0 type:0x7) [Disk-format plugin.]
"oid40"             (id:0x0 type:0x8) [Inode number allocator plugin.]
"alloc40"           (id:0x0 type:0x9) [Space allocator plugin.]
"journal40"         (id:0x0 type:0xa) [Journal plugin.]
"key_short"         (id:0x0 type:0xb) [Short key plugin.]
"key_large"         (id:0x1 type:0xb) [Large key plugin.]
"lzo1"              (id:0x0 type:0xc) [lzo1 compression transform plugin.]
"gzip1"             (id:0x1 type:0xc) [gzip1 compression transform
plugin.]
"none"              (id:0x0 type:0xd) ['Don't compress' compression mode
plugin.]
"latt"              (id:0x1 type:0xd) ['Check on dynamic lattice'
compression mode plugin.]
"ultim"             (id:0x2 type:0xd) ['Check ultimately' compression mode
plugin.]
"force"             (id:0x3 type:0xd) ['Compress evrything' compression
mode plugin.]
"conv"              (id:0x4 type:0xd) ['Convert to extent' compression
mode plugin.]
"64K"               (id:0x0 type:0x10) [64K size cluster plugin.]
"32K"               (id:0x1 type:0x10) [32K size cluster plugin.]
"16K"               (id:0x2 type:0x10) [16K size cluster plugin.]
"8K"                (id:0x3 type:0x10) [8K size cluster plugin.]
"4K"                (id:0x4 type:0x10) [4K size cluster plugin.]



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'Installing your Linux Distribution on Reiser4.' - [Found this as a guide]

[doiggl]

On Wed, 25 May 2016 20:22:05 +1000, <doiggl@velocitynet.com.au> wrote:
> On Tue, 24 May 2016 11:58:53 +0300, Georgios Tsalikis
> <georgios@tsalikis.net> wrote:
>> I happened to format a rootfs partition and another one for /home with 
>> Reiser4. It proved to be a disaster. Apart from the slow boot times 
>> (expected from this drive) even after reaching a functional GUI the 
>> disk kept doing I/O  like crazy. When /home became Btrfs the issue 
>> ceased. My other computer that uses an entire drive formatted with 
>> Reiser4 is nice and silent as well.
>> 
> Hello,
Found this as a guide
--Glenn

'Installing your Linux Distribution on Reiser4.'
http://linuxhelp.150m.com/installs/install-on-reiser4.htm

Re: Two Reiser4 FSs in the same HDD cause head seek panic?

[Jonáš Vidra]

On Tue, 24 May 2016 10:58:53 +0200 Georgios Tsalikis  
<georgios@tsalikis.net> wrote:

> I happened to format a rootfs partition and another one for /home with  
> Reiser4. It proved to be a disaster. Apart from the slow boot times  
> (expected from this drive) even after reaching a functional GUI the disk  
> kept doing I/O  like crazy. When /home became Btrfs the issue ceased. My  
> other computer that uses an entire drive formatted with Reiser4 is nice  
> and silent as well.

How large are the disks? The long boot time may be (at least partially)
caused by bitmap loading – try mount option “dont_load_bitmap”.
This won't help you with seeking *after* boot, though. It will actually
make it worse.

Do you have a proper IO scheduler set? What does
“cat /sys/block/sdX/queue/scheduler” say? (Replace sdX with the correct
identifier.)

Is there anything interesting in the system logs? I'm assuming there isn't.

-- 
Jonáš Vidra, vidra.jonas@seznam.cz
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