shaba/lvm2
1
0
Fork 0
mirror of git://sourceware.org/git/lvm2.git synced 2025-03-29 06:50:38 +03:00
Code Releases Activity

test: use direct I/O when injecting bad data into RAID images

Browse Source 
When directly corrupting RAID images for the purpose of testing,
we must use direct I/O (or a 'sync' after the 'dd') to ensure that
the writes are not caught in the buffer cache in a way that is not
reachable by the top-level RAID device.
This commit is contained in:
Jonathan Brassow 2014-05-30 17:26:10 -05:00
parent 0362169277
commit 4454a580df
1 changed files with 5 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
test/shell/lvchange-syncaction-raid.sh
View File

@ -13,7 +13,10 @@
. lib/test
aux have_raid 1 5 0 || skip
# Proper mismatch count 1.5.2+ upstream, 1.3.5 < x < 1.4.0 in RHEL6
aux have_raid 1 3 5 &&
! aux have_raid 1 4 0 ||
aux have_raid 1 5 2 || skip
aux prepare_vg 3
lvcreate -n $lv1 $vg -l1 --type raid1
@ -22,16 +25,7 @@ START=$(get pv_field "$dev2" pe_start --units 1k)
METASIZE=$(get lv_field $vg/${lv1}_rmeta_1 size -a --units 1k)
SEEK=$((${START%\.00k} + ${METASIZE%\.00k}))
# Overwrite some portion of _rimage_1
dd if=/dev/urandom of="$dev2" bs=1K count=1 seek=$SEEK
lvchange --syncaction check $vg/$lv1
# hmmm it's still in 'dd' buffer and not on real disk ??
# anyway skip over with 'should'
should check lv_field $vg/$lv1 raid_mismatch_count "128"
# Ensure it's all on disk now
sync
dd if=/dev/urandom of="$dev2" bs=1K count=1 seek=$SEEK oflag=direct
lvchange --syncaction check $vg/$lv1
check lv_field $vg/$lv1 raid_mismatch_count "128"