Changes between Version 14 and Version 15 of TipAndDoc/storage/LVM

Timestamp:

May 10, 2015 1:00:40 PM (10 years ago)

Author:

mitty

Comment:

--

TipAndDoc/storage/LVM

@@ -198 +198 @@
 
  * [http://www.slideshare.net/akirahayakawa716/dmthin20140528 dm-thin-internal-ja] dm-thin実装調査
+
+ == /etc/lvm/lvm.conf ==
+ === error_when_full ===
+ * 0 (default)
+  * thin poolが一杯になると、書き込みはキューイングされる。thin poolはout-of-data-space modeになる
+{{{
+May 10 12:35:10 raid-test lvm[303]: Thin vg-pool0-tpool is now 96% full.
+May 10 12:40:36 raid-test kernel: device-mapper: thin: 252:2: reached low water mark for data device: sending event.
+May 10 12:40:36 raid-test kernel: device-mapper: thin: 252:2: switching pool to out-of-data-space mode
+May 10 12:40:36 raid-test lvm[303]: Thin vg-pool0-tpool is now 100% full.
+}}}
+  * #l vs -a -o+lv_when_full
+{{{
+  LV              VG   Attr       LSize   Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert WhenFull
+  lv1             vg   Vwi-aotz--   3.00g pool0        66.67
+  pool0           vg   twi-aotzD-   2.00g              100.00 25.98                            queue
+}}}
+  * (デフォルトでは)60秒、thin poolが拡張されるのを待ち、失敗するとファイルシステムへエラーを返す。thin poolは read-only modeになる
+{{{
+May 10 12:41:36 raid-test kernel: device-mapper: thin: 252:2: switching pool to read-only mode
+May 10 12:41:36 raid-test kernel: EXT4-fs warning (device dm-8): ext4_end_bio:317: I/O error -5 writing to inode 17 (offset 25165824 size 8388608 starting block 591856)
+May 10 12:41:36 raid-test kernel: buffer_io_error: 38109 callbacks suppressed
+May 10 12:41:36 raid-test kernel: Buffer I/O error on device dm-8, logical block 591856
+May 10 12:41:36 raid-test kernel: EXT4-fs warning (device dm-8): ext4_end_bio:317: I/O error -5 writing to inode 17 (offset 25165824 size 8388608 starting block 591857)
+May 10 12:41:36 raid-test kernel: Buffer I/O error on device dm-8, logical block 591857
+
+(snip)
+
+May 10 12:41:36 raid-test kernel: device-mapper: thin: 252:2: metadata operation 'dm_pool_commit_metadata' failed: error = -1
+May 10 12:41:36 raid-test kernel: device-mapper: thin: 252:2: aborting current metadata transaction
+May 10 12:41:36 raid-test kernel: device-mapper: thin: 252:2: switching pool to read-only mode
+}}}
+  * # lvs -a -o+lv_when_full
+{{{
+  LV              VG   Attr       LSize   Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert WhenFull
+  lv1             vg   Vwi-aotz--   3.00g pool0        66.67
+  pool0           vg   twi-aotzM-   2.00g              100.00 25.98                            queue
+}}}
+  * read-onlyから復旧するには、全てのthin LVをinactivate -> thin pool LVをinactivate -> lvconvert --repair thinpoolLV する必要がある
+ * 1
+  * thin poolが一杯になると、書き込みは即座に失敗する。
+{{{
+May 10 12:53:17 raid-test kernel: device-mapper: thin: 252:2: reached low water mark for data device: sending event.
+May 10 12:53:17 raid-test kernel: device-mapper: thin: 252:2: switching pool to out-of-data-space mode
+May 10 12:53:17 raid-test kernel: EXT4-fs warning (device dm-8): ext4_end_bio:317: I/O error -28 writing to inode 17 (offset 33554432 size 8388608 starting block 591872)
+May 10 12:53:17 raid-test kernel: buffer_io_error: 39292 callbacks suppressed
+May 10 12:53:17 raid-test kernel: Buffer I/O error on device dm-8, logical block 591872
+May 10 12:53:17 raid-test kernel: EXT4-fs warning (device dm-8): ext4_end_bio:317: I/O error -28 writing to inode 17 (offset 33554432 size 8388608 starting block 591873)
+
+(snip)
+
+May 10 12:53:17 raid-test lvm[303]: Thin vg-pool0-tpool is now 100% full.
+May 10 12:53:27 raid-test kernel: EXT4-fs warning: 135366 callbacks suppressed
+May 10 12:53:27 raid-test kernel: EXT4-fs warning (device dm-8): ext4_end_bio:317: I/O error -28 writing to inode 17 (offset 588054528 size 4857856 starting block 727248)
+May 10 12:53:27 raid-test kernel: buffer_io_error: 135366 callbacks suppressed
+
+(snip)
+}}}
+  * # lvs -a -o+lv_when_full
+{{{
+  lv1             vg   Vwi-aotz--   3.00g pool0        66.67
+  pool0           vg   twi-aotzD-   2.00g              100.00 26.86                            error
+}}}
+  * fstrimなどを用いて、割り当てを解放すると、すぐに復旧する
+{{{
+May 10 12:55:29 raid-test kernel: device-mapper: thin: 252:2: switching pool to write mode
+May 10 12:55:29 raid-test kernel: device-mapper: thin: 252:2: switching pool to write mode
+}}}
+  * # lvs -a -o+lv_when_full
+{{{
+  lv1             vg   Vwi-aotz--   3.00g pool0        65.62
+  pool0           vg   twi-aotz--   2.00g              98.44  26.46                            error
+}}}
+
+ * オンラインで即座に変更可能
+  * # lvchange --errorwhenfull y vg/pool0
+{{{
+  Logical volume "pool0" changed.
+}}}