8.1-RELEASE: ZFS data errors
Mike Carlson
carlson39 at llnl.gov
Mon Nov 8 19:11:31 UTC 2010
On 11/08/2010 11:06 AM, Jeremy Chadwick wrote:
> On Mon, Nov 08, 2010 at 10:32:56AM -0800, Mike Carlson wrote:
>> I'm having a problem with stripping 7 18TB RAID6 (hardware SAN)
>> volumes together.
>>
>> Here is a quick rundown of the hardware:
>> * HP DL180 G6 w/12GB ram
>> * QLogic FC HBA (Qlogic ISP 2532 PCI FC-AL Adapter)
>> * Winchester Hardware SAN,
>>
>> da2 at isp0 bus 0 scbus2 target 0 lun 0
>> da2:<WINSYS SX2318R 373O> Fixed Direct Access SCSI-5 device
>> da2: 800.000MB/s transfers
>> da2: Command Queueing enabled
>> da2: 19074680MB (39064944640 512 byte sectors: 255H 63S/T 2431680C)
>>
>>
>> As soon as I create the volume and write data to it, it is reported
>> as being corrupted:
>>
>> write# zpool create filevol001 da2 da3 da4 da5 da6 da7 da8
>> write# zpool scrub filevol001dd if=/dev/random
>> of=/filevol001/random.dat.1 bs=1m count=1000
>> write# dd if=/dev/random of=/filevol001/random.dat.1 bs=1m count=1000
>> 1000+0 records in
>> 1000+0 records out
>> 1048576000 bytes transferred in 16.472807 secs (63654968 bytes/sec)
>> write# cd /filevol001/
>> write# ls
>> random.dat.1
>> write# md5 *
>> MD5 (random.dat.1) = 629f8883d6394189a1658d24a5698bb3
>> write# cp random.dat.1 random.dat.2
>> cp: random.dat.1: Input/output error
>> write# zpool status
>> pool: filevol001
>> state: ONLINE
>> scrub: none requested
>> config:
>>
>> NAME STATE READ WRITE CKSUM
>> filevol001 ONLINE 0 0 0
>> da2 ONLINE 0 0 0
>> da3 ONLINE 0 0 0
>> da4 ONLINE 0 0 0
>> da5 ONLINE 0 0 0
>> da6 ONLINE 0 0 0
>> da7 ONLINE 0 0 0
>> da8 ONLINE 0 0 0
>>
>> errors: No known data errors
>> write# zpool scrub filevol001
>> write# zpool status
>> pool: filevol001
>> state: ONLINE
>> status: One or more devices has experienced an error resulting in data
>> corruption. Applications may be affected.
>> action: Restore the file in question if possible. Otherwise restore the
>> entire pool from backup.
>> see: http://BLOCKEDwww.BLOCKEDsun.com/msg/ZFS-8000-8A
>> scrub: scrub completed after 0h0m with 2437 errors on Mon Nov 8
>> 10:14:20 2010
>> config:
>>
>> NAME STATE READ WRITE CKSUM
>> filevol001 ONLINE 0 0 2.38K
>> da2 ONLINE 0 0 1.24K 12K repaired
>> da3 ONLINE 0 0 1.12K
>> da4 ONLINE 0 0 1.13K
>> da5 ONLINE 0 0 1.27K
>> da6 ONLINE 0 0 0
>> da7 ONLINE 0 0 0
>> da8 ONLINE 0 0 0
>>
>> errors: 2437 data errors, use '-v' for a list
>>
>> However, if I create a 'raidz' volume, no errors occur:
>>
>> write# zpool destroy filevol001
>> write# zpool create filevol001 raidz da2 da3 da4 da5 da6 da7 da8
>> write# zpool status
>> pool: filevol001
>> state: ONLINE
>> scrub: none requested
>> config:
>>
>> NAME STATE READ WRITE CKSUM
>> filevol001 ONLINE 0 0 0
>> raidz1 ONLINE 0 0 0
>> da2 ONLINE 0 0 0
>> da3 ONLINE 0 0 0
>> da4 ONLINE 0 0 0
>> da5 ONLINE 0 0 0
>> da6 ONLINE 0 0 0
>> da7 ONLINE 0 0 0
>> da8 ONLINE 0 0 0
>>
>> errors: No known data errors
>> write# dd if=/dev/random of=/filevol001/random.dat.1 bs=1m count=1000
>> 1000+0 records in
>> 1000+0 records out
>> 1048576000 bytes transferred in 17.135045 secs (61194821 bytes/sec)
>> write# zpool scrub filevol001
>>
>> dmesg output:
>> write# zpool status
>> pool: filevol001
>> state: ONLINE
>> scrub: scrub completed after 0h0m with 0 errors on Mon Nov 8
>> 09:54:51 2010
>> config:
>>
>> NAME STATE READ WRITE CKSUM
>> filevol001 ONLINE 0 0 0
>> raidz1 ONLINE 0 0 0
>> da2 ONLINE 0 0 0
>> da3 ONLINE 0 0 0
>> da4 ONLINE 0 0 0
>> da5 ONLINE 0 0 0
>> da6 ONLINE 0 0 0
>> da7 ONLINE 0 0 0
>> da8 ONLINE 0 0 0
>>
>> errors: No known data errors
>> write# ls
>> random.dat.1
>> write# cp random.dat.1 random.dat.2
>> write# cp random.dat.1 random.dat.3
>> write# cp random.dat.1 random.dat.4
>> write# cp random.dat.1 random.dat.5
>> write# cp random.dat.1 random.dat.6
>> write# cp random.dat.1 random.dat.7
>> write# md5 *
>> MD5 (random.dat.1) = f5e3467f61a954bc2e0bcc35d49ac8b2
>> MD5 (random.dat.2) = f5e3467f61a954bc2e0bcc35d49ac8b2
>> MD5 (random.dat.3) = f5e3467f61a954bc2e0bcc35d49ac8b2
>> MD5 (random.dat.4) = f5e3467f61a954bc2e0bcc35d49ac8b2
>> MD5 (random.dat.5) = f5e3467f61a954bc2e0bcc35d49ac8b2
>> MD5 (random.dat.6) = f5e3467f61a954bc2e0bcc35d49ac8b2
>> MD5 (random.dat.7) = f5e3467f61a954bc2e0bcc35d49ac8b2
>>
>> What is also odd, is if I create 7 separate ZFS volumes, they do not
>> report any data corruption:
>>
>> write# zpool destroy filevol001
>> write# zpool create test01 da2
>> write# zpool create test02 da3
>> write# zpool create test03 da4
>> write# zpool create test04 da5
>> write# zpool create test05 da6
>> write# zpool create test06 da7
>> write# zpool create test07 da8
>> write# zpool status
>> pool: test01
>> state: ONLINE
>> scrub: none requested
>> config:
>>
>> NAME STATE READ WRITE CKSUM
>> test01 ONLINE 0 0 0
>> da2 ONLINE 0 0 0
>>
>> errors: No known data errors
>>
>> pool: test02
>> state: ONLINE
>> scrub: none requested
>> config:
>>
>> NAME STATE READ WRITE CKSUM
>> test02 ONLINE 0 0 0
>> da3 ONLINE 0 0 0
>>
>> errors: No known data errors
>>
>> pool: test03
>> state: ONLINE
>> scrub: none requested
>> config:
>>
>> NAME STATE READ WRITE CKSUM
>> test03 ONLINE 0 0 0
>> da4 ONLINE 0 0 0
>>
>> errors: No known data errors
>>
>> pool: test04
>> state: ONLINE
>> scrub: none requested
>> config:
>>
>> NAME STATE READ WRITE CKSUM
>> test04 ONLINE 0 0 0
>> da5 ONLINE 0 0 0
>>
>> errors: No known data errors
>>
>> pool: test05
>> state: ONLINE
>> scrub: none requested
>> config:
>>
>> NAME STATE READ WRITE CKSUM
>> test05 ONLINE 0 0 0
>> da6 ONLINE 0 0 0
>>
>> errors: No known data errors
>>
>> pool: test06
>> state: ONLINE
>> scrub: none requested
>> config:
>>
>> NAME STATE READ WRITE CKSUM
>> test06 ONLINE 0 0 0
>> da7 ONLINE 0 0 0
>>
>> errors: No known data errors
>>
>> pool: test07
>> state: ONLINE
>> scrub: none requested
>> config:
>>
>> NAME STATE READ WRITE CKSUM
>> test07 ONLINE 0 0 0
>> da8 ONLINE 0 0 0
>>
>> errors: No known data errors
>> write# dd if=/dev/random of=/tmp/random.dat.1 bs=1m count=1000
>> 1000+0 records in
>> 1000+0 records out
>> 1048576000 bytes transferred in 19.286735 secs (54367730 bytes/sec)
>> write# cd /tmp/
>> write# md5 /tmp/random.dat.1
>> MD5 (/tmp/random.dat.1) = f795fa09e1b0975c0da0ec6e49544a36
>> write# cp random.dat.1 /test01 ; cp random.dat.1 /test02 ;cp
>> random.dat.1 /test03 ; cp random.dat.1 /test04 ; cp random.dat.1
>> /test05 ; cp random.dat.1 /test06 ; cp random.dat.1 /test07
>> write# md5 /test*/*
>> MD5 (/test01/random.dat.1) = f795fa09e1b0975c0da0ec6e49544a36
>> MD5 (/test02/random.dat.1) = f795fa09e1b0975c0da0ec6e49544a36
>> MD5 (/test03/random.dat.1) = f795fa09e1b0975c0da0ec6e49544a36
>> MD5 (/test04/random.dat.1) = f795fa09e1b0975c0da0ec6e49544a36
>> MD5 (/test05/random.dat.1) = f795fa09e1b0975c0da0ec6e49544a36
>> MD5 (/test06/random.dat.1) = f795fa09e1b0975c0da0ec6e49544a36
>> MD5 (/test07/random.dat.1) = f795fa09e1b0975c0da0ec6e49544a36
>> write# zpool scrub test01 ; zpool scrub test02 ;zpool scrub test03
>> ;zpool scrub test04 ; zpool scrub test05 ; zpool scrub test06 ;
>> zpool scrub test07
>> write# zpool status
>> pool: test01
>> state: ONLINE
>> scrub: scrub completed after 0h0m with 0 errors on Mon Nov 8
>> 10:27:49 2010
>> config:
>>
>> NAME STATE READ WRITE CKSUM
>> test01 ONLINE 0 0 0
>> da2 ONLINE 0 0 0
>>
>> errors: No known data errors
>>
>> pool: test02
>> state: ONLINE
>> scrub: scrub completed after 0h0m with 0 errors on Mon Nov 8
>> 10:27:52 2010
>> config:
>>
>> NAME STATE READ WRITE CKSUM
>> test02 ONLINE 0 0 0
>> da3 ONLINE 0 0 0
>>
>> errors: No known data errors
>>
>> pool: test03
>> state: ONLINE
>> scrub: scrub completed after 0h0m with 0 errors on Mon Nov 8
>> 10:27:54 2010
>> config:
>>
>> NAME STATE READ WRITE CKSUM
>> test03 ONLINE 0 0 0
>> da4 ONLINE 0 0 0
>>
>> errors: No known data errors
>>
>> pool: test04
>> state: ONLINE
>> scrub: scrub completed after 0h0m with 0 errors on Mon Nov 8
>> 10:27:57 2010
>> config:
>>
>> NAME STATE READ WRITE CKSUM
>> test04 ONLINE 0 0 0
>> da5 ONLINE 0 0 0
>>
>> errors: No known data errors
>>
>> pool: test05
>> state: ONLINE
>> scrub: scrub completed after 0h0m with 0 errors on Mon Nov 8
>> 10:28:00 2010
>> config:
>>
>> NAME STATE READ WRITE CKSUM
>> test05 ONLINE 0 0 0
>> da6 ONLINE 0 0 0
>>
>> errors: No known data errors
>>
>> pool: test06
>> state: ONLINE
>> scrub: scrub completed after 0h0m with 0 errors on Mon Nov 8
>> 10:28:02 2010
>> config:
>>
>> NAME STATE READ WRITE CKSUM
>> test06 ONLINE 0 0 0
>> da7 ONLINE 0 0 0
>>
>> errors: No known data errors
>>
>> pool: test07
>> state: ONLINE
>> scrub: scrub completed after 0h0m with 0 errors on Mon Nov 8
>> 10:28:05 2010
>> config:
>>
>> NAME STATE READ WRITE CKSUM
>> test07 ONLINE 0 0 0
>> da8 ONLINE 0 0 0
>>
>> errors: No known data errors
>>
>> Based on these results, I've drawn the following conclusion:
>> * ZFS single pool per device = OKAY
>> * ZFS raidz of all devices = OKAY
>> * ZFS stripe of all devices = NOT OKAY
>>
>> The results are immediate, and I know ZFS will self-heal, so is that
>> what it is doing behind my back and just not reporting it? Is this a
>> ZFS bug with striping vs. raidz?
> Can you reproduce this problem using RELENG_8? Please try one of the
> below snapshots.
>
> ftp://BLOCKEDftp4.freebsd.org/pub/FreeBSD/snapshots/201011/
>
The server is in a data center with limited access control, do I have to
option of using a particular CVS tag (checking out via csup) and then
perform a make world/kernel?
If so, I can report back later today, otherwise it might take longer :(
Mike C
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