Comments on: TIER-0.2.3 is available for download

By: Riccardo Bicelli

Riccardo Bicelli — Mon, 29 Oct 2012 13:06:53 +0000

Hey Maru!
It is safe to use Tier+EPRD in a production environment? I’m planning to build a tiered iSCSI storage (Tier with EPRD on SSD, SAS, SATA) on a Dell PowerEdge R710 with dual power supply (Each one connected to a different UPS), 32 GB ECC Memory with daily backup?
I have to substitute my Equallogic for a couple weeks due to a requalification procedure.

Thx!

By: Marius

Marius — Mon, 29 Oct 2012 09:35:37 +0000

Hello,
I have the same issue with version 0.3.1, but lsmod clearly shows, that tier is loaded.
Do I have to do something before creating the first device?

Best regards,
Marius

By: Syeen

Syeen — Thu, 18 Oct 2012 07:26:34 +0000

Hi Mark, when you said initialize the device, does it mean something similar to formatting the device hence clearing all the data? I have issued insmod tier.ko without any error.

By: maru

maru — Thu, 18 Oct 2012 06:13:13 +0000

Make sure that you have loaded the kernel module : insmod tier.ko

The first time, and first time only, you have to initialize the device with -c:
./tier_setup -c -f /dev/mapper/datavg-datalv:/mnt/NAS

By: Syeen

Syeen — Thu, 18 Oct 2012 04:54:30 +0000

Hi mark,

I have done make and it was compiled successfully. When I tried setting up tier with the following command :

./tier_setup -f /dev/mapper/datavg-datalv:/mnt/NAS

It failed with the following error:

Failed to open /dev/tiercontrol, is tier.ko loaded?

Did I miss out any step? Is make the only step i have to carry out? After I set up with tier_setup, how do I check if it’s running? What else do I need to do? Sorry for the long list of questions, i can’t find any documentation on this.

By: Erik Sørnes

Erik Sørnes — Mon, 08 Oct 2012 09:54:13 +0000

Sorry, the patch got misconfigured when I pasted it, but it’s just replacements of lines, so I guess the picture is clear.

By: Erik Sørnes

Erik Sørnes — Mon, 08 Oct 2012 09:49:57 +0000

Hi!
I have experimented with kernels 2.6.32-2.6.39, and make fails on quite a few of them. I don’t know if this patch to tier.c is programatically correct, but at least it makes the module compile without errors on all of these kernels.

877c877
= KERNEL_VERSION(3,0,0)
—
> #if LINUX_VERSION_CODE == KERNEL_VERSION(2,6,32) || LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,35)
1014c1014
= KERNEL_VERSION(3,0,0)
—
> #if LINUX_VERSION_CODE == KERNEL_VERSION(2,6,32) || LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,35)
1123c1123
< #if LINUX_VERSION_CODE #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,37)
1136c1136
< #if LINUX_VERSION_CODE #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,35)
1140c1140
< #if LINUX_VERSION_CODE #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,37)
1175c1175
< #if LINUX_VERSION_CODE #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,37)
1774c1774
= KERNEL_VERSION(3,0,0)
—
> #if LINUX_VERSION_CODE == KERNEL_VERSION(2,6,32) || LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,37)

By: Mark Ruijter

Mark Ruijter — Mon, 08 Oct 2012 08:33:06 +0000

Hi Erik,

It looks like you have to keep these lines unmodified then.
Did you try this? Most likely the 2.6.38 kernel has some changes implemented but not all.

#if LINUX_VERSION_CODE <= KERNEL_VERSION(3,0,0)
barrier = bio_rw_flagged(bio, BIO_RW_BARRIER);
#endif
if (bio_rw(bio) == WRITE) {
#if LINUX_VERSION_CODE bi_rw & REQ_FLUSH) {
#endif

By: Erik Sørnes

Erik Sørnes — Mon, 08 Oct 2012 07:26:33 +0000

Sorry for posting the first reply out of thread. I just want to tell you that after also changing every occurence of

#if LINUX_VERSION_CODE <= KERNEL_VERSION(3,0,0,)
in tier.c to
#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,37)
the module compiled and inserted without errors.

By: Erik Sørnes

Erik Sørnes — Mon, 08 Oct 2012 07:11:00 +0000

I did that, and the compilation went a bit further.
Now it stops on:

tier-0.3.1/tier.c: In function ‘tier_do_bio’:
tier-0.3.1/tier.c:1137:2: error: implicit declaration of function ‘bio_rw_flagged’
tier-0.3.1/tier.c:1137:32: error: ‘BIO_RW_BARRIER’ undeclared (first use in this function)