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
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