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Author Topic: dns-343 smart status abnormal - is it worth to change from RAID5 to two RAID1?  (Read 2391 times)

exequos

  • Level 1 Member
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  • Posts: 13

Hello All,

As we use products which are just getting more bad as more and long we use them - sometimes it is good time to review and change overview, sometimes it is good to buy new fresh products, sometimes replace to new what is possible

I use DNS-343 f/w 1.05 (f/w date 05/31/2011) with 3x 1,5TB Seagate ST31500341AS configured in RAID5

This configuration runs everyday for about 2 years 24/7 as a local backup for files

so far there was no problems but as I can check in the Hard Drive Info after email alert
One harddrive have status Abnormal

Raid is still completed but i think that it will not be for long time so i am thinking about some changes

First of all - When i though about what will happen if raid will go off - i felt quite safe after reading some posts refering to the software which can help - anyway

What if i don't want to use special software to recover RAID5 drives?
Is it better to use RAID1? What if the one drive of RAID1 will fail - can i just use the second one to copy data even via ext usb bay - or i will have to use additional software or raid rebuild?

What i am thinking about as the simple solution -

I will buy 2pcs of 2TB drives (eg. ST32000542AS)
I will copy all current RAID5 data to this new drives (it is less than 2TB)
I will degrade RAID5 and make from two good drives 1,5TB RAID1
then i will copy back data to RAID1 array and create second RAID1 array with this two 2TB drives
finally - i will use 1,5TB RAID1 array for daily usage and second 2TB RAID1 array as additional backup based on some ext scripts (zipping specific files etc) -

And... if any drive will fail or even DNS-343 will fail - i will just take working drive and copy data from them then if possible make rebuild or buy new dns-343 and try to use drives/rebuild...

Of course the simplest way is to buy 1pcs of 1,5TB HDD and just replace and rebuild of RAID5... but if one drive have abnormal smart and probably will fail soon... i can expect that second two will fail in short time too

I would appreciate if someone can give me opinion on above

Thanks!

btw: the abnormal smart details from dns-343 web are as below

Quote
Slot 3 S.M.A.R.T INFO
Id - Item - Now - Worst - Thresh - Raw Value
1   Raw_Read_Error_Rate   116   99   6   100749537
3   Spin_Up_Time   100   99   0   0
4   Start_Stop_Count   100   100   20   13
5   Reallocated_Sector_Ct   1   1   36   4095
7   Seek_Error_Rate   85   60   30   356129839
9   Power_On_Hours   75   75   0   22662
10   Spin_Retry_Count   100   100   97   0
12   Power_Cycle_Count   100   37   20   12
184   End-to-End_error   100   100   99   0
187   Reported_Uncorrect   95   95   0   5
188   Command_Timeout   100   100   0   0
189   High_Fly_Writes   1   1   0   1254
190   Airflow_Temperature_Cel   59   49   45   41
194   Temperature_Celsius   41   51   0   41
195   Hardware_ECC_Recovered   50   21   0   100749537
197   Current_Pending_Sector   100   100   0   0
198   Offline_Uncorrectable   100   100   0   0
199   UDMA_CRC_Error_Count   200   200   0   0
240   Head_Flying_Hours   100   253   0   2147483647
241   Unknown_Attribute   100   253   0   2147483647
242   Unknown_Attribute   100   253   0   1173881535
« Last Edit: January 30, 2012, 04:37:40 PM by exequos »
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DNS343 f/w1.05