zfs discuss - Mar 2010 - zpool reporting consistent read errors

I''m running a raidz1 with 3 Samsung 1.5TB drives.  Every time I scrub
the pool I get multiple read errors, no write errors and no checksum errors on
one drive (always the same drive, and no data loss).

I''ve changed cables, changed the sata ports the drives are attached to,
I always get the same outcome.  The drives are new.  Is this likely a drive
problem?

TIA
-- 
This message posted from opensolaris.org

On Mon, March 15, 2010 00:54, noone at euphoriq.com
wrote:
> I''m running a raidz1 with 3 Samsung 1.5TB drives.  Every time I
scrub the
> pool I get multiple read errors, no write errors and no checksum errors on
> one drive (always the same drive, and no data loss).
>
> I''ve changed cables, changed the sata ports the drives are
attached to, I
> always get the same outcome.  The drives are new.  Is this likely a drive
> problem?
Given what you''ve already changed, it''s sounding like it could
well be a
drive problem.  The one other thing that comes to mind is power to the
drive.

-- 
David Dyer-Bennet, dd-b at dd-b.net; http://dd-b.net/
Snapshots: http://dd-b.net/dd-b/SnapshotAlbum/data/
Photos: http://dd-b.net/photography/gallery/
Dragaera: http://dragaera.info

Wow.  I never thought about it.  I changed the power supply to a cheap one a
while back (a now seemingly foolish effort to save money) - it could be the
issue.  I''ll change it back and let you know.

Thanks
-- 
This message posted from opensolaris.org

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

On 15.03.2010 21:13, noone at euphoriq.com wrote:
> Wow.  I never thought about it.  I changed the power supply to a cheap one
a while back (a now seemingly foolish effort to save money) - it could be the
issue.  I''ll change it back and let you know.
"cheap" powersupplies rarely are.  ;)

It''s been my experience that if you "overengineer" the psu a
bit, the
efficiency of the PSU increases (it''s no longer pushing 100% of its
rated spec) and actually the consumed power (on the 220v side) drops.

//Svein

- -- 
- --------+-------------------+-------------------------------
  /"\   |Svein Skogen       | svein at d80.iso100.no
  \ /   |Solberg ?stli 9    | PGP Key:  0xE5E76831
   X    |2020 Skedsmokorset | svein at jernhuset.no
  / \   |Norway             | PGP Key:  0xCE96CE13
        |                   | svein at stillbilde.net
 ascii  |                   | PGP Key:  0x58CD33B6
 ribbon |System Admin       | svein-listmail at stillbilde.net
Campaign|stillbilde.net     | PGP Key:  0x22D494A4
        +-------------------+-------------------------------
        |msn messenger:     | Mobile Phone: +47 907 03 575
        |svein at jernhuset.no | RIPE handle:    SS16503-RIPE
- --------+-------------------+-------------------------------
         If you really are in a hurry, mail me at
               svein-mobile at stillbilde.net
 This mailbox goes directly to my cellphone and is checked
        even when I''m not in front of my computer.
- ------------------------------------------------------------
                     Picture Gallery:
          https://gallery.stillbilde.net/v/svein/
- ------------------------------------------------------------
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v2.0.12 (MingW32)
Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/

iEYEARECAAYFAkuemfgACgkQSBMQn1jNM7ZJ5gCghZuA3LnqkZnA54zddSlrkG6Y
MbcAoK8RU5td2Xx79q+Wmbztth7pB217
=pRID
-----END PGP SIGNATURE-----

On Mon, March 15, 2010 15:35, Svein Skogen wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> On 15.03.2010 21:13, noone at euphoriq.com wrote:
>> Wow.  I never thought about it.  I changed the power supply to a cheap
>> one a while back (a now seemingly foolish effort to save money) - it
>> could be the issue.  I''ll change it back and let you know.
>
> "cheap" powersupplies rarely are.  ;)
I''ve had all types fail on me.  I think I''ve had more power
supplies than
disk drives fail on me, even.

And they can produce the most *amazing* range of symptoms, if they
don''t
fail completely.  Quite remarkable.
> It''s been my experience that if you "overengineer" the
psu a bit, the
> efficiency of the PSU increases (it''s no longer pushing 100% of
its
> rated spec) and actually the consumed power (on the 220v side) drops.
Strangely enough, running up to the limit is hard on components, yes.

-- 
David Dyer-Bennet, dd-b at dd-b.net; http://dd-b.net/
Snapshots: http://dd-b.net/dd-b/SnapshotAlbum/data/
Photos: http://dd-b.net/photography/gallery/
Dragaera: http://dragaera.info

In the end, it was the drive.  I replaced the drive and all the errors went
away.  Another testimony to ZFS - all my data was intact after the resilvering
process, even with some other errors in the pool.  ZFS resilvered the entire new
disk and fixed the other errors.  You have to love ZFS.
-- 
This message posted from opensolaris.org