Comments on: EPRD – An eventually persistent ramdisk / disk cache

By: Roemer2201

Roemer2201 — Fri, 23 Nov 2012 20:10:37 +0000

I think I have to report a Bug:

lessfs[1123]: Please report this bug and include hash and offset : E855F9952B32424D751A236B84F43F139B3A7E7FCF23BE61
lessfs[1123]: file_tgr_read_data : read block expected offset 10784662016, size 227, got size 0

Do you need more Information about my config?

By: Sahil

Sahil — Mon, 05 Nov 2012 22:52:45 +0000

Hi Maru

I’m working on a similar project and I was wondering if you ever had to face issues reading the image file within the kernel? I’m trying to use vfs_read to read my image file but the call to read freezes! My read routine looks like yours and I don’t see you doing anything different. But I’m not sure what’s causing my reads to hang.

Sahil

By: eric

eric — Sun, 04 Nov 2012 03:24:51 +0000

just find some projects :http://sourceforge.net/projects/pramfs/
you can see.
now eprd still can’t use for product…?
thanks.

By: Kirill

Kirill — Wed, 15 Aug 2012 08:35:43 +0000

[root@ws04 home]# ls -al
итого 16
drwxr-xr-x. 4 root root 4096 авг. 14 19:46 .
drwxr-xr-x. 21 root root 4096 авг. 15 09:57 ..
drwx——. 51 kirill kirill1 4096 сент. 29 2011 kirill
-rw——- 1 root root 1073741824 авг. 14 19:46 persramdisk.img
drwx—— 24 user user 4096 мая 28 14:22 user

from dmesg
[ 0.000000] Kernel command line: initrd=FedoraXX_32/initramfs.ws04 ro root=/dev/sde1 netroot=iscsi:@192.168.184.220::3260::iqn.2010-11.bitel.office.vs01:ws04-fc16 iscsi_initiator=iqn.2010-11.bitel.office.vs01 rd_NO_LUKS rd_NO_LVM rd_NO_MD rd_NO_DM LANG=ru_RU.UTF-8 SYSFONT=latarcyrheb-sun16 KEYTABLE=us plymouth.enable=0 selinux=0 BOOT_IMAGE=FedoraXX_32/vmlinuz.ws04

By: maru

maru — Tue, 14 Aug 2012 14:15:43 +0000

Some more questions:
Has the file been created?
Which kernel / distro?

Anything special when you look at dmesg?

By: Kirill

Kirill — Tue, 14 Aug 2012 13:46:03 +0000

[root@ws04 eprd-0.4.2]# ./eprd_setup -f /home/persramdisk.img -s 1G -c

creating a new blockdevice
datafile=/home/persramdisk.img
commit_interval = 0
Blockdevice size = 1073741824
ioctl EPRD_SET_DTAFD failed on /dev/eprdcontrol
ioctl EPRD_SET_DTAFD failed

By: maru

maru — Tue, 14 Aug 2012 12:58:39 +0000

Did you initially create the device with -c ?

By: Kirill

Kirill — Tue, 14 Aug 2012 12:33:52 +0000

On Fedora 17
[root@ws04 eprd-0.4.2]# uname -a
Linux ws04.local 3.5.0-2.fc17.i686.PAE #1 SMP Mon Jul 30 15:18:54 UTC 2012 i686 i686 i386 GNU/Linux

[root@ws04 eprd-0.4.2]# ./eprd_setup -f /home/persramdisk.img
Using an existing blockdevice
datafile=/home/persramdisk.img
commit_interval = 0
Blockdevice size = 1073741824
ioctl EPRD_SET_DTAFD failed on /dev/eprdcontrol
ioctl EPRD_SET_DTAFD failed

By: Bob

Bob — Sun, 03 Jun 2012 01:16:23 +0000

1.5.12

By: Bob

Bob — Sun, 03 Jun 2012 01:15:27 +0000

Me too. Exact same issue. CentOS 6.2