ALFA
Explorer
- Joined
- Aug 23, 2014
- Messages
- 53
are the new Western Digital WD4001FFSX the only or Red Pro the only one with the non-recoverable read error rate better than the others at < 10^15 bits?
for what I read the disks with the < 10^14 bits the 100% considered to be sure to find an non-recoverable read error rate if for 10 TB (0.01 PB), so for instance you can't have a 4TB - 10 disk raidZ-2 because it would be totally useless, even a raidZ-3
for example, if 10 disk of 4TB it would be a total of 40 TB raw storage (29 of usable storage) so when the 10 TB mark is read is almost a 100% chance of encountering a hard disk error, the failed cause the raid to rebuild and we can then expect another disk failure because all of the remaining 9 drives will have to be need read (36 TB) ,hitting another 10 TB of data, and another hard disk error, now for the RaidZ-2 there is non protecction (2 failure disk), rebuilding and reading the another 8 disk (32 TB) it sure will hit again the 10 TB mark, therefore the second rebuild is very likely to fail.
I don't remember the exact page, but the title was SAS vs. SATA from enterprisestorageforum.com
¿It's all this true?
¿What do you think guys from this new WD Red Pro HDD?
I am not an expert so I seek advice from more experienced in this forum
Thanks and kind regards to all
EDIT. found the page SAS VS SATA
for what I read the disks with the < 10^14 bits the 100% considered to be sure to find an non-recoverable read error rate if for 10 TB (0.01 PB), so for instance you can't have a 4TB - 10 disk raidZ-2 because it would be totally useless, even a raidZ-3
for example, if 10 disk of 4TB it would be a total of 40 TB raw storage (29 of usable storage) so when the 10 TB mark is read is almost a 100% chance of encountering a hard disk error, the failed cause the raid to rebuild and we can then expect another disk failure because all of the remaining 9 drives will have to be need read (36 TB) ,hitting another 10 TB of data, and another hard disk error, now for the RaidZ-2 there is non protecction (2 failure disk), rebuilding and reading the another 8 disk (32 TB) it sure will hit again the 10 TB mark, therefore the second rebuild is very likely to fail.
I don't remember the exact page, but the title was SAS vs. SATA from enterprisestorageforum.com
¿It's all this true?
¿What do you think guys from this new WD Red Pro HDD?
I am not an expert so I seek advice from more experienced in this forum
Thanks and kind regards to all
EDIT. found the page SAS VS SATA
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