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Louwtjie Burger wrote:
> On 11/8/07, Richard Elling <[EMAIL PROTECTED]> wrote:
>> Potentially, depending on the write part of the workload, the system may
>> read
>> 128 kBytes to get a 16 kByte block. This is not efficient and may be
>> noticeable
>>
Yes. Blocks are compressed individually, so a smaller block size will (on
average) lead to less compression. (Assuming that your data is compressible at
all, that is.)
This message posted from opensolaris.org
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Louwtjie Burger writes:
> Hi
>
> What is the impact of not aligning the DB blocksize (16K) with ZFS,
> especially when it comes to random reads on single HW RAID LUN.
>
> How would one go about measuring the impact (if any) on the workload?
>
The DB will have a bigger in memory footprint
>
> Also... doesn't ZFS do some form of read ahead .. 64KB anyways?
>
I believe you are referring to the vdev cache here. Check out:
http://blogs.sun.com/erickustarz/entry/vdev_cache_improvements_to_help
eric
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Louwtjie Burger wrote:
> On 11/8/07, Richard Elling <[EMAIL PROTECTED]> wrote:
>
>> Louwtjie Burger wrote:
>>
>>> Hi
>>>
>>> What is the impact of not aligning the DB blocksize (16K) with ZFS,
>>> especially when it comes to random reads on single HW RAID LUN.
>>>
>>>
>> Potentially,
On 11/8/07, Richard Elling <[EMAIL PROTECTED]> wrote:
> Louwtjie Burger wrote:
> > Hi
> >
> > What is the impact of not aligning the DB blocksize (16K) with ZFS,
> > especially when it comes to random reads on single HW RAID LUN.
> >
>
> Potentially, depending on the write part of the workload, the
Is compression impacted when setting block size?
--zoly
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Richard Elling
Sent: Thursday, November 08, 2007 1:56 PM
To: Louwtjie Burger
Cc: zfs-discuss@opensolaris.org
Subject: Re: [zfs-discuss] ZFS + DB
Louwtjie Burger wrote:
> Hi
>
> What is the impact of not aligning the DB blocksize (16K) with ZFS,
> especially when it comes to random reads on single HW RAID LUN.
>
Potentially, depending on the write part of the workload, the system may
read
128 kBytes to get a 16 kByte block. This is not
Hi
What is the impact of not aligning the DB blocksize (16K) with ZFS,
especially when it comes to random reads on single HW RAID LUN.
How would one go about measuring the impact (if any) on the workload?
Thank you
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