ZFS: i/o error - all block copies unavailable after upgrading after make installkerne

chmiels · #1 September 2nd, 2011, 09:43

I've got strange problem after updating my system from source. I'm running -CURRENT setup with instructions from wiki: http://wiki.freebsd.org/RootOnZFS/GPTZFSBoot (it was originally stable/8 upgraded to -CURRENT using source). It was running fine until yesterday, exact steps which I've performed:
# zfs snapshot zroot@8.2
# make buildworld
# make buildkernel KERNCONF=MYKERNEL
# make installkernel KERNCONF=MYKERNEL
# reboot
...
after reboot boot loader gives me following error message:

Code:

ZFS: i/o error - all block copies unavailable

when I rollback to previously created snapshot (8.2) system boots fine. zpool.cache in /boot/zfs wasn't touched during update.
It's very strange to me, because as I understand # make installkernel does nothing with bootloader or gptzfsloader. I've being updates from source many times before on this setup and never experienced such problem. Updating boot loader using # gpart bootcode didn't help
(symptoms are the same for gptzfsboot from http://people.freebsd.org/~pjd/zfsboot/ and loader from my -CURRENT installed during 'make installworld' earlier).
Partition layout:

# gpart show

Code:

=>       34  250069613  ada0  GPT  (119G)
         34        128     1  freebsd-boot  (64k)
        162       1886     5  bios-boot  (943k)
       2048   16777216     2  !0fc63daf-8483-4772-8e79-3d69d8477de4  (8.0G)
   16779264   33554432     3  freebsd-ufs  (16G)
   50333696  199735951     4  freebsd-zfs  (95G)

Partitions 3 and 4 are separate zfs pools (3 is geli encrypted home pool and 4 is for
operating system).

# zfs list

Code:

NAME                        USED  AVAIL  REFER  MOUNTPOINT
home                       10,4G  5,24G  10,4G  /home
zroot                      90,2G  3,27G  1,16G  legacy

/etc/fstab

Code:

# Device		Mountpoint	FStype	Options			Dump	Pass#
zroot			/		zfs	rw,noatime		0	0
/dev/acd0		/cdrom		cd9660	ro,noauto		0	0
proc 		/proc 		procfs 	rw 			0	0

Any ideas?

akil · #2 September 2nd, 2011, 13:27

Hi

By default 8.2 support zpool v15, so after upgrading sources you also upgrade supported version of v28. That means you have to upgrade your pool from v15 to v28. Maybe that explain what is the root cause.

Could you check what is your pool version ?
# zpool get version zroot

chmiels · #3 September 2nd, 2011, 13:37

My pool is at version 15, I didn't upgraded pool because my rescue disk is in version 8.2 (so I'm still able to rollback).
Please notice that 8.2 I've used in snapshot name doesn't mean OS version it is only a name of snapshot. There are also some other snapshots in this pool. It's already running -CURRENT, so I still don't understand why it fails to boot after 'make installkernel' which simply copies kernel image from build directory to /boot. I'll try comparing kernel images, checking disk for errors and freeing some space.
Problem with 'gptzfsboot' is that it's not to verbose and doesn't have test or debug mode.

chmiels · #4 September 7th, 2011, 20:17

For those interested - problem occurs when you have almost full filesystem with compression.

**avilla@** · #5 April 24th, 2012, 08:20

Quote:

Originally Posted by chmiels

For those interested - problem occurs when you have almost full filesystem with compression.

Just for reference, while this may help, it's not necessarily the solution. To "fix" this I had to move /boot elsewhere and copy it back to ensure files were rewritten properly.

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
ZFS drives going unavailable	Pawtuxet	System Hardware	13	February 22nd, 2011 14:08
ZFS and '-o copies=2' at /etc and booting, weird ...	uisge	General	5	December 24th, 2010 00:37
ZFS Unavailable	diss3ntive	General	8	August 6th, 2010 09:31
Kmem_map too small panic with big file copies on ZFS and 8.0	levinas69	General	6	June 17th, 2010 09:37
ZFS zpool unavailable	Voltar	General	2	July 31st, 2009 22:17

The Following User Says Thank You to chmiels For This Useful Post:
avilla@ (April 23rd, 2012)

The Following User Says Thank You to avilla@ For This Useful Post:
Tarick (May 17th, 2012)