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Immense delayed write to file system (ZFS and UFS2), performance issues
From the FreeBSD stable mailing list:
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You don't need to be a genius to debug a pf.conf firewall ruleset, you just need the guts to run tcpdump Last edited by J65nko; 20th January 2010 at 10:35 PM. Reason: boldfacing the disk type |
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Freddie, these problems occured only with FreeBSD 8 or also with FreeBSD 7?
I'm also curious if you have GP drives or GP RE (Raid Edition) drives? This is interesting because we sell quite a few WD drives, as of late I've noticed the GP drives are become more and more common ... Running a few test with this and different OS' just got on my TODO list ...
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UNIX was not designed to stop you from doing stupid things, because that would also stop you from doing clever things. |
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From http://www.nordic-pc.com/node/422
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You don't need to be a genius to debug a pf.conf firewall ruleset, you just need the guts to run tcpdump |
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What's really annoying is the huge jumble of drive variations that are available. Jeremy Chadwick broke it down into a nice table on one of the FreeBSD mailing lists. We've learnt our lesson, and won't be using any drives with Green in the name from now on, regardless of the manufacturer. |
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The most annoying thing is that the "idle timeout" to park the heads is ... 8 seconds. In a desktop drive!! Talk about unnecessary wear and tear on the drive. Just browsing the web will causes the drive to thunk about, since Firefox has a 30s (or 10s?) "update the open tabs list" timer. So if you read a page for more than 8s, the drive will park. I can understand having that feature in a laptop drive, where you don't want to be spinning the drive unless absolutely necessary. But in a desktop drive? WD is going to be getting a lot of returns on Green drives. |
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Contrary to the vast majority of online reports ... one can use the wdidle3 utility to "disable" this horrible idle timeout setting.
While one cannot truly disable it, one can set the timeout to 62 minutes, effectively disabling it. Or select a value that reflects your workload. I've "disabled" this on the 7 drives that have been put into our storage server. The resilver throughput for that 7th drive has jumped from an average of 7 MBps to an average of 40 MBps!! Checking the Load_Cycle_Count via smartctl now shows the numbers as not moving. Previously, they would go up quite quickly (1 drive has 50,000 after less than 2 months of use). Even using a twiddle script running every 5 seconds wouldn't completely stop this from increasing. Unfortunately, the wdtler utility does not work on these drives. But it's still an improvement. So maybe they aren't totally worthless drives. |
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OK, this is interesting information. I've been planning on moving my storage on my home file server to a fairly large raidz2 config for some time but hasn't gotten around buying the drives and doing it.
I guess to aviod future headaches, it's best to stay away from anything with "green" in it. To bad, they are usually a pretty good bargain. (I remember seeing part of this discussion in the mailling list archives, but must have missed the last bit.) |
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can you point link to that table?
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Verbose mode can also be turned on for SSH2 with the (surprise!) VerboseMode keyword. |
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I'm considering getting a pair of WD15EADS drives (1.5TB GP/32MB cache), for a gmirror.
There's also the WD15EARS, which has 64MB cache (Which is near-useless AFAIK) and so called "Advanced format", which seems to be some sort of marketing speak for a 4K sector size. Is there any advantage for a 4K sector size instead of the default 512 bytes? I know about the disk alignment (Start at 64, not 63), but is there are real world benefit or drawback? (It's also 15 euro's more expensive) Most importantly however, the WD site mentions: Quote:
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UNIX was not designed to stop you from doing stupid things, because that would also stop you from doing clever things. |
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http://tomshardware.com/reviews/wd-4k-sector,2554.html Quote:
http://forums.freebsd.org/showpost.php?p=98908&postcount=21
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religions, worst damnation of mankind "If 386BSD had been available when I started on Linux, Linux would probably never had happened." Linus Torvalds Linux is not UNIX! Face it! It is not an insult. It is fact: GNU is a recursive acronym for “GNU's Not UNIX”. vermaden's: links resources deviantart spreadbsd |
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4 KB drives from other manufacturers correctly report the real physical sector size, so the OS/filesystem will work correctly. |
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So I got the WD15EADS, used wdidle, and that worked great:
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9 Power_On_Hours 0x0032 100 100 000 Old_age Always - 60 193 Load_Cycle_Count 0x0032 200 200 000 Old_age Always - 4 I also had the chance to get my hands on some other WD GP disks such as the WD10EADS and WD20EARS, and wdidle worked on those too. ... When I look on the interwebz I get conflicting reports about which drives do and don't work ... Internet sucks.
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UNIX was not designed to stop you from doing stupid things, because that would also stop you from doing clever things. |
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intelli-park, iowait, western digital green power |
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