Chris Csanady writes:
> On 5/26/06, Bart Smaalders <[EMAIL PROTECTED]> wrote:
> >
> > There are two failure modes associated with disk write caches:
>
> Failure modes aside, is there any benefit to a write cache when command
> queueing is available? It seems that the primary advantage is i
[EMAIL PROTECTED] schrieb:
What about IDE drives (PATA, SATA). Currently only the sd driver implements
enabling/disabling the write cache?
They typically have write caches enabled by default; and some
don't take ckindly to disabling the write cache or do not allow
it at all.
But you could at
>What about IDE drives (PATA, SATA). Currently only the sd driver implements
>enabling/disabling the write cache?
They typically have write caches enabled by default; and some
don't take ckindly to disabling the write cache or do not allow
it at all.
>Also the WCE bit isn't reset if a zpool is
Bart Smaalders schrieb:
ZFS enables the write cache and flushes it when committing transaction
groups; this insures that all of a transaction group appears or does
not appear on disk.
What about IDE drives (PATA, SATA). Currently only the sd driver implements
enabling/disabling the write cache
On Fri, 2006-05-26 at 17:40, Bart Smaalders wrote:
> Gregory Shaw wrote:
> > I had a question to the group:
> > In the different ZFS discussions in zfs-discuss, I've seen a
> > recurring theme of disabling write cache on disks. I would think that
> > the performance increase of using write ca
ZFS enables the write cache and flushes it when committing transaction
groups; this insures that all of a transaction group appears or does
not appear on disk.
It also flushes the disk write cache before returning from every
synchronous request (eg fsync, O_DSYNC). This is done after
writing o
On 5/26/06, Bart Smaalders <[EMAIL PROTECTED]> wrote:
There are two failure modes associated with disk write caches:
Failure modes aside, is there any benefit to a write cache when command
queueing is available? It seems that the primary advantage is in allowing
old ATA hardware to issue writ
Gregory Shaw wrote:
I had a question to the group:
In the different ZFS discussions in zfs-discuss, I've seen a
recurring theme of disabling write cache on disks. I would think that
the performance increase of using write cache would be an advantage, and
that write cache should be enabled.
Gregory Shaw wrote:
In recent Linux distributions, when the kernel shuts down, the
kernel will force the scsi drives to flush their write cache. I don't
know if solaris does the same but I think not, due to the ongoing focus
of solaris and disabling write cache.
The Solaris sd(7D) S
I had a question to the group:
In the different ZFS discussions in zfs-discuss, I've seen a
recurring theme of disabling write cache on disks. I would think that
the performance increase of using write cache would be an advantage,
and that write cache should be enabled.
Realistically, I ca
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