On Jun 15, 2010, at 8:51 PM, Richard Elling wrote
>> I thought, if you didn't explicitly tune these, all sync writes go to ZIL
>> before the main store. Can't seem to find any way to verify this.
>
> Cake. All sync writes go to the ZIL. The ZIL may be in the pool or in
> the separate log device
On Jun 15, 2010, at 8:13 PM, Edward Ned Harvey wrote:
>> From: zfs-discuss-boun...@opensolaris.org [mailto:zfs-discuss-
>> boun...@opensolaris.org] On Behalf Of Bob Friesenhahn
>>
>> It is good to keep in mind that only small writes go to the dedicated
>> slog. Large writes to to main store. A
> From: zfs-discuss-boun...@opensolaris.org [mailto:zfs-discuss-
> boun...@opensolaris.org] On Behalf Of Bob Friesenhahn
>
> It is good to keep in mind that only small writes go to the dedicated
> slog. Large writes to to main store. A succession of that many small
> writes (to fill RAM/2) is hi
On 06/14/10 19:35, Erik Trimble wrote:
On 6/14/2010 12:10 PM, Neil Perrin wrote:
On 06/14/10 12:29, Bob Friesenhahn wrote:
On Mon, 14 Jun 2010, Roy Sigurd Karlsbakk wrote:
It is good to keep in mind that only small writes go to the dedicated
slog. Large writes to to main store. A succession o
On Jun 14, 2010, at 6:35 PM, Erik Trimble wrote:
> On 6/14/2010 12:10 PM, Neil Perrin wrote:
>> On 06/14/10 12:29, Bob Friesenhahn wrote:
>>> On Mon, 14 Jun 2010, Roy Sigurd Karlsbakk wrote:
>>>
> It is good to keep in mind that only small writes go to the dedicated
> slog. Large writes to
On 6/14/2010 12:10 PM, Neil Perrin wrote:
On 06/14/10 12:29, Bob Friesenhahn wrote:
On Mon, 14 Jun 2010, Roy Sigurd Karlsbakk wrote:
It is good to keep in mind that only small writes go to the dedicated
slog. Large writes to to main store. A succession of that many small
writes (to fill RAM/2)
On 06/14/10 12:29, Bob Friesenhahn wrote:
On Mon, 14 Jun 2010, Roy Sigurd Karlsbakk wrote:
It is good to keep in mind that only small writes go to the dedicated
slog. Large writes to to main store. A succession of that many small
writes (to fill RAM/2) is highly unlikely. Also, that the zil is
On Mon, 14 Jun 2010, Roy Sigurd Karlsbakk wrote:
It is good to keep in mind that only small writes go to the dedicated
slog. Large writes to to main store. A succession of that many small
writes (to fill RAM/2) is highly unlikely. Also, that the zil is not
read back unless the system is improper
- Original Message -
> On Mon, 14 Jun 2010, Roy Sigurd Karlsbakk wrote:
>
> >> There is absolutely no sense in having slog devices larger than
> >> then main memory, because it will never be used, right?
> >> ZFS will rather flush the txg to disk than reading back from
> >> zil? So there i
On Mon, 14 Jun 2010, Roy Sigurd Karlsbakk wrote:
There is absolutely no sense in having slog devices larger than
then main memory, because it will never be used, right?
ZFS will rather flush the txg to disk than reading back from
zil? So there is a guideline to have enough slog to hold about 10
Roy Sigurd Karlsbakk wrote:
>> There is absolutely no sense in having slog devices larger than
>> then main memory, because it will never be used, right?
>> ZFS will rather flush the txg to disk than reading back from
>> zil? So there is a guideline to have enough slog to hold about 10
>> seconds o
Edward Ned Harvey wrote:
>> From: zfs-discuss-boun...@opensolaris.org [mailto:zfs-discuss-
>> boun...@opensolaris.org] On Behalf Of Arne Jansen
>>
>> There is absolutely no sense in having slog devices larger than
>> then main memory, because it will never be used, right?
>
> Also: A TXG is guara
> From: zfs-discuss-boun...@opensolaris.org [mailto:zfs-discuss-
> boun...@opensolaris.org] On Behalf Of Arne Jansen
>
> There is absolutely no sense in having slog devices larger than
> then main memory, because it will never be used, right?
Also: A TXG is guaranteed to flush within 30 sec. Le
> There is absolutely no sense in having slog devices larger than
> then main memory, because it will never be used, right?
> ZFS will rather flush the txg to disk than reading back from
> zil? So there is a guideline to have enough slog to hold about 10
> seconds of zil, but the absolute maximum v
On Mon, Jun 14, 2010 at 4:41 AM, Arne Jansen wrote:
> Hi,
>
> I known it's been discussed here more than once, and I read the
> Evil tuning guide, but I didn't find a definitive statement:
>
> There is absolutely no sense in having slog devices larger than
> then main memory, because it will neve
Hi,
I known it's been discussed here more than once, and I read the
Evil tuning guide, but I didn't find a definitive statement:
There is absolutely no sense in having slog devices larger than
then main memory, because it will never be used, right?
ZFS will rather flush the txg to disk than readi
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