then you're OK.
> > Anything else is going to suck.
thanks for pointing out the obvious. :)
Still, though, this is basically true for ANY drive.
It's worse for slower RPM drives, but it's not like resilvers will
exactly be fast with 7200rpm drives, either.
danno
--
Dan Prit
On Mon, May 17, 2010 at 06:25:18PM +0200, Tomas Ögren wrote:
> Resilver does a whole lot of random io itself, not bulk reads.. It reads
> the filesystem tree, not "block 0, block 1, block 2..". You won't get
> 60MB/s sustained, not even close.
Even with large, unfragmente
turns into
random i/o. Which is slow on these drives.
danno
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tes to swap the disks out.
I did something very similar but with over 1000 CDs. If you can scare
up an external DVD drive, use it too - that way you'll have to change
half as many times.
danno
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Dan Pritts, Sr. Systems Engineer
Internet2
office: +1-734-352-4953 | mobile: +1-734-834-722
ul tales to tell about promise
FC arrays. They were clearly not ready for prime time.
OTOH a SAS jbod is a lot less complicated.
danno
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the drive, especially for the price
paid.
I agree with Al that it probably isn't suitable as a ZIL. Maybe as a
read cache though.
danno
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Dan Pritts, Sr. Systems Engineer
Internet2
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Winter 2010 ESCC/Internet2 Joint Techs
Hosted by the Un
On Nov 4, 2009, at 6:02 PM, Jim Klimov wrote:
> Thanks for the link, but the main concern in spinning down drives of a ZFS
> pool
> is that ZFS by default is not so idle. Every 5 to 30 seconds it closes a
> transaction
> group (TXG) which requires a synchronous write of metadata to disk.
I'm r
king it up to
the 7110; it has plenty of PCI slots.
finally, one question - I presume that I need to devote a pair of disks
to the OS, so I really only get 14 disks for data. Correct?
thanks!
danno
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Dan Pritts, Sr. Systems Engineer
Internet2
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stec (Promise) or zfs.
the way i'd try to do this would be to use the same box under solaris
software RAID, or better yet linux or windows software RAID (to make
sure it's not a solaris device driver problem).
does pulling the disk then get noticed? If so, it's a zfs bug
a little pucker for my colleagues when it happened while i
was on vacation. The support guy at the reseller we were working with
(NOT Western Scientific) told them the raid was hosed and they should
rebuild from scratch, hope you had a backup.
danno
--
Dan Pritts, System Administrator
Interne
pull a disk and goes on and does the right thing.
I wonder if you've got a scsi card/driver problem. We tried using
an Adaptec card with solaris with poor results; switched to LSI,
it "just works".
danno
--
Dan Pritts, System Administrator
Internet
windows
> machinesis there any similar solution on the win machines?
none that i'm aware of; windows does have software mirroring, of
course. Make lots of backups :).
danno
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Dan Pritts, System Administrator
Internet2
office: +1-734-352-4953 | mobile: +1-734-834-7224
[1]
http://www
ere i've heard about it)
wants to be awful sure that the drive actually flushes its write cache
when you ask for it.
Regardless, the speed difference is marginal.
danno
--
Dan Pritts, System Administrator
Internet2
office: +1-734-352-4953 | mobile: +1-734-834-7224
_
have NCQ, you'd lose on some random i/o workloads by
adding the PATA disk. But, i think that you need SATA300 to support
that feature.
danno
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Dan Pritts, System Administrator
Internet2
office: +1-734-352-4953 | mobile: +1-734-834-7224
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