On Tue, Nov 20, 2012 at 6:25 PM, NeilBrown <neilb@xxxxxxx> wrote: > > On Tue, 20 Nov 2012 14:00:35 -0300 Salatiel Filho <salatiel.filho@xxxxxxxxx> > wrote: > > > []'s > > Salatiel > > > > > > On Tue, Nov 20, 2012 at 8:02 AM, Salatiel Filho > > <salatiel.filho@xxxxxxxxx> wrote: > > > Thanks Neil ! > > > []'s > > > Salatiel > > > > > > > > > On Mon, Nov 19, 2012 at 10:26 PM, NeilBrown <neilb@xxxxxxx> wrote: > > >> On Sun, 18 Nov 2012 10:42:22 -0300 Salatiel Filho <salatiel.filho@xxxxxxxxx> > > >> wrote: > > >> > > >>> Hi guys, i will be building a few arrays very soon and i'd like to > > >>> test the badblock feature and the replaceable feature, but i haven`t > > >>> found where i can download the source of mdadm 1.3. Where can i get it > > >>> ? > > >>> > > >> You can't. 3.3 doesn't exist yet. > > >> > > >> However > > >> git clone git://neil.brown.name/mdadm > > >> cd mdadm > > >> make > > >> > > >> will get you code that supports bad blocks and replaceable devices. > > >> > > >> Alternately you can get a tar file at > > >> > > >> http://git.neil.brown.name/git?p=mdadm.git;a=snapshot;h=master > > >> > > >> NeilBrown > > > > Forgot to send a copy to the list: > > > > > > Now the question, how do i enable badblock list ? > > # mdadm -A /dev/md1 /dev/sd[bcd]2 --update=bbl ? > > Yes, I think that is right - does it work? > > > > > I actually created also a new array > > # mdadm -C -n4 -l5 -e 1.2 /dev/md2 /dev/sd[bcde]3 , > > but how do i verify if badblock support was enabled ? > > mdadm -E /dev/sdb3 > > should show > > Bad Block Log : 512 entries available at offset xxx sectors > > NeilBrown > > > -- > > To unsubscribe from this list: send the line "unsubscribe linux-raid" in > > the body of a message to majordomo@xxxxxxxxxxxxxxx > > More majordomo info at http://vger.kernel.org/majordomo-info.html > Well, about the tests: I have put some data on a degraded raid 5 with 3 disks where one of them has random read errors. After that i added a new disk and the raid started to resync. After 62.5% i started getting read errors on /dev/sdd2 and the array stopped to resync. 1) Shouldn`t badblocks be ignored to allow the recover of most data? I can see in mdadm -E /dev/sdd2 Bad Block Log : 512 entries available at offset 262128 sectors - bad blocks present. 2) After stop the array and try to reassembled with mdadm -A /dev/md1 /dev/sd[bcde]2 --force i got the following message: mdadm -A /dev/md1 /dev/sd[bcde]2 --force mdadm: forcing event count in /dev/sdb2(0) from 87705 upto 87713 mdadm: forcing event count in /dev/sdc2(1) from 87705 upto 87713 mdadm: /dev/md1 has been started with 3 drives (out of 4). and i noticed that sde2 was not added to the array. # mdadm -D /dev/md1 /dev/md1: Version : 1.2 Creation Time : Tue Nov 20 08:43:35 2012 Raid Level : raid5 Array Size : 3918320640 (3736.80 GiB 4012.36 GB) Used Dev Size : 1306106880 (1245.60 GiB 1337.45 GB) Raid Devices : 4 Total Devices : 3 Persistence : Superblock is persistent Intent Bitmap : Internal Update Time : Sun Nov 25 10:04:06 2012 State : active, degraded Active Devices : 3 Working Devices : 3 Failed Devices : 0 Spare Devices : 0 Layout : left-symmetric Chunk Size : 512K Name : zotac:1 (local to host zotac) UUID : 93e55a39:94681b9d:4c0a1a15:cad51a71 Events : 87713 Number Major Minor RaidDevice State 0 8 18 0 active sync /dev/sdb2 1 8 34 1 active sync /dev/sdc2 2 8 50 2 active sync /dev/sdd2 6 0 0 6 removed After add it manually , mdadm -a /dev/md1 /dev/sde2 the rebuild started from the beginning, ignoring the recovery offset: # mdadm -E /dev/sde2 /dev/sde2: Magic : a92b4efc Version : 1.2 Feature Map : 0xb Array UUID : 93e55a39:94681b9d:4c0a1a15:cad51a71 Name : zotac:1 (local to host zotac) Creation Time : Tue Nov 20 08:43:35 2012 Raid Level : raid5 Raid Devices : 4 Avail Dev Size : 3592190757 (1712.89 GiB 1839.20 GB) Array Size : 3918320640 (3736.80 GiB 4012.36 GB) Used Dev Size : 2612213760 (1245.60 GiB 1337.45 GB) Data Offset : 262144 sectors Super Offset : 8 sectors Recovery Offset : 1634547480 sectors State : clean Device UUID : 08019409:984c2217:21706201:039b6bbf Internal Bitmap : 8 sectors from superblock Update Time : Sun Nov 25 10:04:06 2012 Bad Block Log : 512 entries available at offset 262128 sectors Checksum : bd6c4947 - correct Events : 87705 Layout : left-symmetric Chunk Size : 512K Device Role : Active device 3 Array State : AAAA ('A' == active, '.' == missing, 'R' == replacing) 3) What's the correct procedure that allows me recover most of the data, ignoring the readerrors ? 4) I know that sdd2 has read errors at sectors 1634863440 - 1634863800, if i write zero directly to those sectors using 'dd' , how will raid behave during rebuild? After a write it will probably be able to read it again (i dont care about the data on those sectors) . 5) Right now i am not using replaceable option , but where replaceable option could help me here ? Thanks ! -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
