On 03/06/2016 08:31 PM, Weedy wrote:
On Sun, Mar 6, 2016 at 7:52 PM, Ram Ramesh <rramesh2400@xxxxxxxxx> wrote:
On 03/06/2016 06:29 PM, Phil Turmel wrote:
On 03/05/2016 03:49 PM, Ram Ramesh wrote:
I am curious if people actually replace hard drives periodically because
they are old or out of warranty. My 5 device raid6 has several older
drives (3/5 are 3+ years old and out of warranty) They seem fine with
SMART and raid scrubs. However, it makes me wonder when they will die.
What is the best policy in such situations? More importantly, do people
wait for disks to die and then replace or have some ad hoc schedule of
replacing (like every 6mo replace oldest) to keep things safe?
I replace drives when their relocation count hits double digits. In my
limited sample, that's typically after 40,000 hours.
Phil
Thanks for the data point. 40K hours means roughly 4.5 years with 24/7. That
is very good. You use enterprise drives?
They don't have to be, cheap crap can last. My case slots the drives
in vertically with large silicone dampers, I feel like this helps.
Model Family: Seagate Barracuda 7200.10
Device Model: ST3320620AS
5 Reallocated_Sector_Ct 0x0033 100 100 036 Pre-fail
Always - 0
9 Power_On_Hours 0x0032 040 040 000 Old_age
Always - 52576
Model Family: Seagate Barracuda 7200.10
Device Model: ST3320620AS
5 Reallocated_Sector_Ct 0x0033 100 100 036 Pre-fail
Always - 0
9 Power_On_Hours 0x0032 048 048 000 Old_age
Always - 46196
Model Family: Western Digital Caviar Black
Device Model: WDC WD1001FALS-00E8B0
5 Reallocated_Sector_Ct 0x0033 200 200 140 Pre-fail
Always - 0
9 Power_On_Hours 0x0032 039 039 000 Old_age
Always - 44551
Model Family: SAMSUNG SpinPoint F1 DT
Device Model: SAMSUNG HD103UJ
5 Reallocated_Sector_Ct 0x0033 100 100 010 Pre-fail
Always - 10
9 Power_On_Hours 0x0032 087 087 000 Old_age
Always - 67735
Model Family: Western Digital Caviar Black
Device Model: WDC WD1001FALS-00E8B0
5 Reallocated_Sector_Ct 0x0033 200 200 140 Pre-fail
Always - 0
9 Power_On_Hours 0x0032 040 040 000 Old_age
Always - 44427
Model Family: SAMSUNG SpinPoint F1 DT
Device Model: SAMSUNG HD103UJ
5 Reallocated_Sector_Ct 0x0033 100 100 010 Pre-fail
Always - 6
9 Power_On_Hours 0x0032 093 093 000 Old_age
Always - 36570
I would say the biggest thing is how often you get a reallocated
sector. The Samsungs seem to get 1-3 a year, they will probably keep
doing that until they die. Past experience with seagate tells me I'm
going to get 10 in one day and the drive will die in a week. The WD
will probably throw a few at a time and I'll dump them when they get
to 10-15 sectors.
I hear you. I have not had any fails myself in my 20+ years. I have
gotten rid of them because they became too small relative what market
offered. Until recently, I had a working 8G (yes, 8G!) IBM IDE drive
from my first computer (20+ years ago) It was a keepsake. They do not
make them this tough these days. I am almost sure that a new seagate
desktop 6TB is not going to last this long.
All said and done, I think I feel I have less to worry. Thanks for
helping me to see that.
I run long selftest once a month and will watch the RAID scrubs and
SMART values. I should be ok until I see my first reallocated sector
hit. After that I will buy my replacements.
Ramesh
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