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Forum Discussion
Seagate ST31500341AS 1.5TB
Any idea when this will be supported :-) Cliff
Hi,
just a few days i was happy with my readynas pro running 4.2.1 and using the new seagate 1.5TB drives. No freezing. But now, like all other users i've experienced the same issue. Also disabeling the write cache did help but decreases the performance by about 50% as expected. Let's try to analyse what really happens:
- No freeze during installation (heavy load)
but in normal operation:
- Freeze when in low throughput mode (dvd media viewing, 200-500KB/sec)
- No freeze when load is high (file copy, read and/or write, 25-60MB/sec) )
- No freeze with disabled write cache (load independent)
The question is: Why does a disabled write-cache inhibits freezing during reed-only operation?
In a raid configuration, blocks are spread over several drives (with checksum to the parity drive), so a quite long time of inactivity may result to certain drives in a given raidset.
My best guess:
- Seagate improved 'green power technologie' (see homepage) to let the drive spin down during inactivity, independent of any OS settings.
- Disabeling the write cache keeps more activity to the drives and pretend them from spinning down.
Hints:
- Having a look at the drive temperaures and system fan speed indicates raised power consumption when write cache is disabled.
- freezing period is about 27 sec and much closer to a spin up time than to the required time by a forced flush of the 32MB cache (should take less than 1sec)
- freezing is not (often) reported with vista (because of heavy drive usage by the OS :-) )
So may be it's not a bug but a (very unpleasant) feature.
Dear Jedi-team, any chance to send a code to the drives to prevent them from spinning-down, just for testing?
just a few days i was happy with my readynas pro running 4.2.1 and using the new seagate 1.5TB drives. No freezing. But now, like all other users i've experienced the same issue. Also disabeling the write cache did help but decreases the performance by about 50% as expected. Let's try to analyse what really happens:
- No freeze during installation (heavy load)
but in normal operation:
- Freeze when in low throughput mode (dvd media viewing, 200-500KB/sec)
- No freeze when load is high (file copy, read and/or write, 25-60MB/sec) )
- No freeze with disabled write cache (load independent)
The question is: Why does a disabled write-cache inhibits freezing during reed-only operation?
In a raid configuration, blocks are spread over several drives (with checksum to the parity drive), so a quite long time of inactivity may result to certain drives in a given raidset.
My best guess:
- Seagate improved 'green power technologie' (see homepage) to let the drive spin down during inactivity, independent of any OS settings.
- Disabeling the write cache keeps more activity to the drives and pretend them from spinning down.
Hints:
- Having a look at the drive temperaures and system fan speed indicates raised power consumption when write cache is disabled.
- freezing period is about 27 sec and much closer to a spin up time than to the required time by a forced flush of the 32MB cache (should take less than 1sec)
- freezing is not (often) reported with vista (because of heavy drive usage by the OS :-) )
So may be it's not a bug but a (very unpleasant) feature.
Dear Jedi-team, any chance to send a code to the drives to prevent them from spinning-down, just for testing?
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