On Jun 20, 2012, at 5:08 PM, Jim Klimov wrote:
> 2012-06-21 1:58, Richard Elling wrote:
>> On Jun 20, 2012, at 4:08 AM, Jim Klimov wrote:
>>>
>>> Also by default if you don't give the whole drive to ZFS, its cache
>>> may be disabled upon pool import and you may have to reenable it
>
>> The behav
2012-06-21 1:58, Richard Elling wrote:
On Jun 20, 2012, at 4:08 AM, Jim Klimov wrote:
Also by default if you don't give the whole drive to ZFS, its cache
may be disabled upon pool import and you may have to reenable it
The behaviour is to attempt to enable the disk's write cache if ZFS has t
On Jun 20, 2012, at 4:08 AM, Jim Klimov wrote:
>
> Also by default if you don't give the whole drive to ZFS, its cache
> may be disabled upon pool import and you may have to reenable it
> manually (if you only actively use this disk for one or more ZFS
> pools - which play with caching nicely).
T
2012-06-20 0:32, Timothy Coalson wrote:
when it has 4k sectors, then in theory if "First sector" is a multiple
of 8, it is aligned, but it will probably issue writes of size 512
which will degrade performance anyway).
I think this is dependent on the firmware (vendor), and queued writes
into th
> I think that if you are running an illumos kernel, you can use
> /kernel/drv/sd.conf
>
> That refers to creating a new pool and is good to know.
Two things: one, it looks like you should also be able to trick it
into using 512 sectors on a 4k disk, allowing you to do exactly such a
replacement (
Hi Timothy,
>
> I think that if you are running an illumos kernel, you can use
> /kernel/drv/sd.conf and tell it that the physical sectors for a disk
> model are 4k, despite what the disk says (and whether they really
> are). So, if you want an ashift=12 pool on disks that report 512
> sectors,
> - Will I be able to buy a replacement in 3-3 years that reports the disk in
> such a way, that resilvering will work? According to the "Advanced Format"
> threat this seems to be a problem. I was hopimg to get arond this with these
> disks and have a more future proof solution
I think that if yo
>
> What makes you think the Barracuda 7200.14 drives report 4k sectors?
http://www.mail-archive.com/zfs-discuss@opensolaris.org/msg48912.html
Nigel stated this here a few days ago. I did not check for myself. Maybe Nigel
can comment on this?
As for the question "why do you want 4k drives":
On Mon, 18 Jun 2012, Carson Gaspar wrote:
What makes you think the Barracuda 7200.14 drives report 4k sectors? I gave
up looking for 4kn drives, as everything I could find was 512e. I would
_love_ to be wrong, as I have 8 4TB Hitachis on backorder that I would gladly
replace with 4kn drives,
On Mon, Jun 18, 2012 at 5:26 PM, Carson Gaspar wrote:
> What makes you think the Barracuda 7200.14 drives report 4k sectors? I gave
> up looking for 4kn drives, as everything I could find was 512e. I would
> _love_ to be wrong, as I have 8 4TB Hitachis on backorder that I would
> gladly replace wi
> What makes you think the Barracuda 7200.14 drives report 4k sectors? I gave
> up looking for 4kn drives, as everything I could find was 512e. I would
> _love_ to be wrong, as I have 8 4TB Hitachis on backorder that I would
> gladly replace with 4kn drives, even if I had to drop to 3TB density.
I
On 6/18/12 4:07 PM, Koopmann, Jan-Peter wrote:
Thanks. Just noticed that the Hitachi 3TB drives are not available. The
4TB ones are but with 512b emulated only. However I can get Barracudas
7200.14 with supposedly real 4k quite cheap. Anyone any experience with
those? I might be getting one or tw
Thanks. Just noticed that the Hitachi 3TB drives are not available. The 4TB
ones are but with 512b emulated only. However I can get Barracudas 7200.14 with
supposedly real 4k quite cheap. Anyone any experience with those? I might be
getting one or two more and go for z2 instead of z1.
I even
On 6/18/12 12:19 AM, Koopmann, Jan-Peter wrote:
Hi Carson,
I have 2 Sans Digital TR8X JBOD enclosures, and they work very well.
They also make a 4-bay TR4X.
http://www.sansdigital.com/towerraid/tr4xb.html
http://www.sansdigital.com/towerraid/tr8xb.html
looks nice! The only th
On Mon, 18 Jun 2012, Koopmann, Jan-Peter wrote:
I browsed the site and saw many 6GBit enclosures. I also saw one with
Nexenta (Solaris/zfs appliance) inside.
I found several high end enclosures. Or ones with bundled RAID cards. But the
equivalent of the one originally
suggested I was not able
Hi Bob,
> On Mon, 18 Jun 2012, Koopmann, Jan-Peter wrote:
>>
>> looks nice! The only thing coming to mind is that according to the
>> specifications the enclosure is 3Gbits "only". If I choose
>> to put in a SSD with 6Gbits this would be not optimal. I looked at their
>> site but failed to fi
On Mon, 18 Jun 2012, Koopmann, Jan-Peter wrote:
looks nice! The only thing coming to mind is that according to the specifications the
enclosure is 3Gbits "only". If I choose
to put in a SSD with 6Gbits this would be not optimal. I looked at their site
but failed to find 6GBit enclosures. But I
On Mon, Jun 18, 2012 at 2:19 PM, Koopmann, Jan-Peter
wrote:
> Hi Carson,
>
>
> I have 2 Sans Digital TR8X JBOD enclosures, and they work very well.
> They also make a 4-bay TR4X.
>
> http://www.sansdigital.com/towerraid/tr4xb.html
> http://www.sansdigital.com/towerraid/tr8xb.html
>
>
> looks nice!
Hi Carson,
>
> I have 2 Sans Digital TR8X JBOD enclosures, and they work very well.
> They also make a 4-bay TR4X.
>
> http://www.sansdigital.com/towerraid/tr4xb.html
> http://www.sansdigital.com/towerraid/tr8xb.html
looks nice! The only thing coming to mind is that according to the
specificati
On 6/17/12 6:36 PM, Timothy Coalson wrote:
No problem, and yes, I think that should work. One thing to keep in
mind, though, is that if the internals of the enclosure simply split
the multilane SAS cable into 4 connectors without an expander, and you
use SATA drives, the controller will use SAT
> worst case). The worst case for 512 emulated sectors on zfs is
> probably small (4KB or so) synchronous writes (which if they mattered
> to you, you would probably have a separate log device, in which case
> the data disk write penalty may not matter).
>
>
> Good to know. This really opens up th
On 6/17/12 3:21 PM, Koopmann, Jan-Peter wrote:
Hi Tim,
you might be able to use
an adapter to the SFF-8088 external 4 lane SAS connector, which may
increase your options.
So what you are saying is that something like this will do the trick?
http://www.pc-pitstop.com/sata_enclosu
Hi Tim,
thanks to you and the others for answering.
> worst case). The worst case for 512 emulated sectors on zfs is
> probably small (4KB or so) synchronous writes (which if they mattered
> to you, you would probably have a separate log device, in which case
> the data disk write penalty may no
On Sun, Jun 17, 2012 at 03:19:18PM -0500, Timothy Coalson wrote:
> Replacing devices will not change the ashift, it is set permanently
> when a vdev is created, and zpool will refuse to replace a device in
> an ashift=9 vdev with a device that it would use ashift=12 on.
Yep.
> [..] while hitachi
2012-06-17 19:11, Koopmann, Jan-Peter пишет:
Hi,
my oi151 based home NAS is approaching a frightening "drive space"
level. Right now the data volume is a 4*1TB Raid-Z1, 3 1/2" local disks
individually connected to an 8 port LSI 6Gbit controller.
So I can either exchange the disks one by one wit
> So I can either exchange the disks one by one with autoexpand, use 2-4 TB
> disks and be happy. This was my original approach. However I am totally
> unclear about the 512b vs 4Kb issue. What sata disk could I use that is big
> enough and still uses 512b? I know about the discussion about the upg
Hi,
my oi151 based home NAS is approaching a frightening "drive space" level. Right
now the data volume is a 4*1TB Raid-Z1, 3 1/2" local disks individually
connected to an 8 port LSI 6Gbit controller.
So I can either exchange the disks one by one with autoexpand, use 2-4 TB disks
and be happy.
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