From mboxrd@z Thu Jan 1 00:00:00 1970 From: Gregory L Shomo Subject: Re: parent transid troubles Date: Wed, 25 May 2011 14:03:01 -0400 Message-ID: References: <1303332799-sup-9175@think> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: linux-btrfs@vger.kernel.org To: Chris Mason Return-path: In-Reply-To: <1303332799-sup-9175@think> (message from Chris Mason on Wed, 20 Apr 2011 16:54:23 -0400) List-ID: Chris Mason writes: >> OK, we've re-compiled linux-2.6.38 patched up to btrfs-unstable >> commit f65647c29b14f5a32ff6f3237b0ef3b375ed5a79 and can now mount >> the filesystem. >> >> Mounting the filesystem read-only from /dev/sdd1 fails, but >> succeeds from /dev/sdc1... after about 4855 parent transid >> verification failures. >> >> kernel: [ 293.827069] Btrfs loaded >> kernel: [ 293.828014] device fsid 2e4187db574846d8-404f05c2e6ec579d devid 2 transid 176065 /dev/sdd1 >> kernel: [ 293.828781] btrfs: failed to read the system array on sdd1 >> kernel: [ 293.835956] btrfs: open_ctree failed >> >> kernel: [ 305.296345] device fsid 2e4187db574846d8-404f05c2e6ec579d devid 1 transid 176066 /dev/sdc1 >> kernel: [ 305.476360] parent transid verify failed on 20403515125760 wanted 176066 found 174710 >> kernel: [ 305.476608] parent transid verify failed on 20403515125760 wanted 176066 found 174710 >> !-- snip >> >> Is there any chance we can resolve some of the parent transid >> verification failures ? What should our next steps be ? >> >> Thank you very much for all your help. > > The failures won't get resolved easily. Many of them will be duplicates > because of the way we do readahead. > > Step one is to copy off the data that you can. dmesg -n 1 will help > prevent performance problems from message floods. > > -chris Now that we've copied-off what we need, shall we just take the plunge and mount read-write ? Is there some way in can clear out the parent transid failures so that we will not have to look at them in the future ? - greg