On 2011-06-21 17:11, Greg Smith wrote:
On 06/21/2011 07:19 AM, Florian Weimer wrote:
3ware controllers offer SMART pass-through, and smartctl supports it.
I'm sure there's something similar for Areca controllers.
Depends on the model, drives, and how you access the management
interface. For both manufacturers actually. Check out
http://notemagnet.blogspot.com/2008/08/linux-disk-failures-areca-is-not-so.html
for example. There I talk about problems with a specific Areca
controller, as well as noting in a comment at the end that there are
limitations with 3ware supporting not supporting SMART reports against
SAS drives.
Part of the whole evaluation chain for new server hardware, especially
for SSD, needs to be a look at what SMART data you can get. Yeb, I'd
be curious to get more details about what you've been seeing here if
you can share it. You have more different models around than I have
access to, especially the OCZ ones which I can't get my clients to
consider still. (Their concerns about compatibility and support from
a relatively small vendor are not completely unfounded)
This is what a windows OCZ tool explains about the different smart
values (excuse for no mark up) for a Vertex 2 Pro.
SMART READ DATA
Revision: 10
Attributes List
1: SSD Raw Read Error Rate Normalized Rate: 120
total ECC and RAISE errors
5: SSD Retired Block Count Reserve blocks
remaining: 100%
9: SSD Power-On Hours Total hours power on: 451
12: SSD Power Cycle Count Count of power on/off
cycles: 61
13: SSD Soft Read Error Rate Normalized Rate: 120
100: SSD GBytes Erased Flash memory erases
across the entire drive: 128 GB
170: SSD Number of Remaining Spares Number of reserve Flash
memory blocks: 17417
171: SSD Program Fail Count Total number of Flash
program operation failures: 0
172: SSD Erase Fail Count Total number of Flash
erase operation failures: 0
174: SSD Unexpected power loss count Total number of
unexpected power loss: 13
177: SSD Wear Range Delta Delta between most-worn
and least-worn Flash blocks: 0
181: SSD Program Fail Count Total number of Flash
program operation failures: 0
182: SSD Erase Fail Count Total number of Flash
erase operation failures: 0
184: SSD End to End Error Detection I/O errors detected
during reads from flash memory: 0
187: SSD Reported Uncorrectable Errors Uncorrectable RAISE
errors reported to the host for all data access: 0
194: SSD Temperature Monitoring Current: 26 High: 37
Low: 0
195: SSD ECC On-the-fly Count Normalized Rate: 120
196: SSD Reallocation Event Count Total number of
reallocated Flash blocks: 0
198: SSD Uncorrectable Sector Count Total number of
uncorrectable errors when reading/writing a sector: 0
199: SSD SATA R-Errors Error Count Current SATA RError
count: 0
201: SSD Uncorrectable Soft Read Error Rate Normalized Rate: 120
204: SSD Soft ECC Correction Rate (RAISE) Normalized Rate: 120
230: SSD Life Curve Status Current state of drive
operation based upon the Life Curve: 100
231: SSD Life Left Approximate SDD life
Remaining: 99%
232: SSD Available Reserved Space Amount of Flash memory
space in reserve (GB): 17
235: SSD Supercap Health Condition of an
external SuperCapacitor Health in mSec: 0
241: SSD Lifetime writes from host Number of bytes written
to SSD: 448 GB
242: SSD Lifetime reads from host Number of bytes read
from SSD: 192 GB
Same tool for a Vertex 3 (not pro)
SMART READ DATA
Revision: 10
Attributes List
1: SSD Raw Read Error Rate Normalized Rate: 120
total ECC and RAISE errors
5: SSD Retired Block Count Reserve blocks
remaining: 100%
9: SSD Power-On Hours Total hours power on: 7
12: SSD Power Cycle Count Count of power on/off
cycles: 13
171: SSD Program Fail Count Total number of Flash
program operation failures: 0
172: SSD Erase Fail Count Total number of Flash
erase operation failures: 0
174: SSD Unexpected power loss count Total number of
unexpected power loss: 10
177: SSD Wear Range Delta Delta between most-worn
and least-worn Flash blocks: 0
181: SSD Program Fail Count Total number of Flash
program operation failures: 0
182: SSD Erase Fail Count Total number of Flash
erase operation failures: 0
187: SSD Reported Uncorrectable Errors Uncorrectable RAISE
errors reported to the host for all data access: 0
194: SSD Temperature Monitoring Current: 128 High: 129
Low: 127
195: SSD ECC On-the-fly Count Normalized Rate: 100
196: SSD Reallocation Event Count Total number of
reallocated Flash blocks: 0
201: SSD Uncorrectable Soft Read Error Rate Normalized Rate: 100
204: SSD Soft ECC Correction Rate (RAISE) Normalized Rate: 100
230: SSD Life Curve Status Current state of drive
operation based upon the Life Curve: 100
231: SSD Life Left Approximate SDD life
Remaining: 100%
241: SSD Lifetime writes from host Number of bytes written
to SSD: 162 GB
242: SSD Lifetime reads from host Number of bytes read
from SSD: 236 GB
There's some info burried in
http://archives.postgresql.org/pgsql-performance/2011-03/msg00350.php
where two Vertex 2 pro's are compared; the first has been really
hammered with pgbench, the second had a few months duty in a
workstation. The raw value of SSD Available Reserved Space seems to be a
good candidate to watch to go to 0, since the pgbenched-drive has 16GB
left and the workstation disk 17GB. Would be cool to graph with e.g.
symon (http://i.imgur.com/T4NAq.png)
--
Yeb Havinga
http://www.mgrid.net/
Mastering Medical Data
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