January 28, 201214 yr I did the whole update from 4.7 to 5.0b14 mainly for 3TB drive support. My question is: Which drive to buy? So-called Green drives or not? 5400 rpm, 5900rpm, or 7200rpm? Hitachi 5K3000 vs. 7K3000? The only ones I can pick up locally at the moment, 2 for starting. After my experience with Western Digital (3 failed drives in 1 year) I aint gonna buy WD again. Will 3 TB drives tax the system (power supply) more than other drives. Is there a special preclear required?
January 28, 201214 yr I did the whole update from 4.7 to 5.0b14 mainly for 3TB drive support. My question is: Which drive to buy? So-called Green drives or not? 5400 rpm, 5900rpm, or 7200rpm? Hitachi 5K3000 vs. 7K3000? The only ones I can pick up locally at the moment, 2 for starting. After my experience with Western Digital (3 failed drives in 1 year) I aint gonna buy WD again. Will 3 TB drives tax the system (power supply) more than other drives. Is there a special preclear required? Since a 5400 RPM drive will slow all write operations by about 1/3rd vs. a 7200 RPM drive, I'd use a 7200RPM drive for parity. I like the Hitachi drives for reliability... at least as reported by most on this forum, although I've had a 2TB Hitachi go bad on me. No idea if a 3TB drive draws more power than a 2TB drive. Odds are not much difference. OTOH, a 7200 RPM drive will draw about 1/3 more power than a 5400 RPM drive (in general) Always use the most recent preclear. Earlier ones did not know how to properly deal with a 3TB drive. One note. Not sure if anyone ever confirmed that a properly pre-cleared 3TB drive is recognized as pre-cleared in the most recent beta14 when adding an additional drive to one that already has established parity. Earlier betas did not, and zeroed it again regardless.
January 28, 201214 yr Author I did the whole update from 4.7 to 5.0b14 mainly for 3TB drive support. My question is: Which drive to buy? So-called Green drives or not? 5400 rpm, 5900rpm, or 7200rpm? Hitachi 5K3000 vs. 7K3000? The only ones I can pick up locally at the moment, 2 for starting. After my experience with Western Digital (3 failed drives in 1 year) I aint gonna buy WD again. Will 3 TB drives tax the system (power supply) more than other drives. Is there a special preclear required? Since a 5400 RPM drive will slow all write operations by about 1/3rd vs. a 7200 RPM drive, I'd use a 7200RPM drive for parity. I like the Hitachi drives for reliability... at least as reported by most on this forum, although I've had a 2TB Hitachi go bad on me. No idea if a 3TB drive draws more power than a 2TB drive. Odds are not much difference. OTOH, a 7200 RPM drive will draw about 1/3 more power than a 5400 RPM drive (in general) Always use the most recent preclear. Earlier ones did not know how to properly deal with a 3TB drive. One note. Not sure if anyone ever confirmed that a properly pre-cleared 3TB drive is recognized as pre-cleared in the most recent beta14 when adding an additional drive to one that already has established parity. Earlier betas did not, and zeroed it again regardless. Thank you Joe, I'll be replacing a 2 TB disk with a 3 TB Hitachi 7200fpm disk first. There will be no harm done I guess when it is zeroed again? It just takes time.
January 29, 201214 yr I did the whole update from 4.7 to 5.0b14 mainly for 3TB drive support. My question is: Which drive to buy? So-called Green drives or not? 5400 rpm, 5900rpm, or 7200rpm? Hitachi 5K3000 vs. 7K3000? The only ones I can pick up locally at the moment, 2 for starting. After my experience with Western Digital (3 failed drives in 1 year) I aint gonna buy WD again. Will 3 TB drives tax the system (power supply) more than other drives. Is there a special preclear required? Since a 5400 RPM drive will slow all write operations by about 1/3rd vs. a 7200 RPM drive, I'd use a 7200RPM drive for parity. I like the Hitachi drives for reliability... at least as reported by most on this forum, although I've had a 2TB Hitachi go bad on me. No idea if a 3TB drive draws more power than a 2TB drive. Odds are not much difference. OTOH, a 7200 RPM drive will draw about 1/3 more power than a 5400 RPM drive (in general) Always use the most recent preclear. Earlier ones did not know how to properly deal with a 3TB drive. One note. Not sure if anyone ever confirmed that a properly pre-cleared 3TB drive is recognized as pre-cleared in the most recent beta14 when adding an additional drive to one that already has established parity. Earlier betas did not, and zeroed it again regardless. Thank you Joe, I'll be replacing a 2 TB disk with a 3 TB Hitachi 7200fpm disk first. There will be no harm done I guess when it is zeroed again? It just takes time. When re-constructing a drive onto a replacement, drives are not "zeroed". They are only zeroed if not precleared and being added as an additional drive to an existing parity protected array. Joe L.
January 29, 201214 yr Author Thanks Joe, now I understand. The drive is currently in the last step of preclearing (Post-read 50 %) In Disk Managwment I see this though: Hitachi_HDS7230_MK0311YHGBXJVA 34°C 3T /dev/sdf partition (2,147,483,647 blocks): /dev/sdf1 I hadn't expected to see a partition, but I see one of a bit over 2 TB, this seems wrong to me. What is your opinion?
February 4, 201214 yr Thanks Joe, now I understand. The drive is currently in the last step of preclearing (Post-read 50 %) In Disk Managwment I see this though: Hitachi_HDS7230_MK0311YHGBXJVA 34°C 3T /dev/sdf partition (2,147,483,647 blocks): /dev/sdf1 I hadn't expected to see a partition, but I see one of a bit over 2 TB, this seems wrong to me. What is your opinion? It is correct, and expected. It is to make legacy programs that read the old style MBR think the drive is fully partitioned. It is referred to as a protective "MBR" (the preclear process creates it for you, and unRAID expects it as part of its preclear signature for the 3TB drives) It shows a partition that is the largest the old style MBR can configure.
February 5, 201214 yr One note. Not sure if anyone ever confirmed that a properly pre-cleared 3TB drive is recognized as pre-cleared in the most recent beta14 when adding an additional drive to one that already has established parity. Earlier betas did not, and zeroed it again regardless. I'm not sure about 5B14... 5B12 does know the preclear flag for 3TB drives. it just takes like 10-15 min to format it once you install a fresh precleard 3TB drive. PS. I'm using all Hitachi 3TB drives. I had almost no issues with them. I have a bakers dozen in my main box.
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