[zfs-discuss] ZiL performance

Ali Hamid itsanstorage at gmail.com
Tue Apr 17 01:30:20 EDT 2018


hi Daniel,Gordan and thanks,

ok, other questions that exist is:
1. if i want use a all flash ssd for my storage , is it must use this
technique?

2. if i set blocksize in my benchmark program to above 64 KB , Is it going
to lead to ignore Slog?
I read, zil is for to 64KB block size ,

thanks,


On Mon, Apr 16, 2018 at 7:25 PM, Daniel Bayerdorffer via zfs-discuss <
zfs-discuss at list.zfsonlinux.org> wrote:

> Hi Ali,
>
> I used this article to do that very same setup.
>
> https://www.thomas-krenn.com/en/wiki/SSD_Over-provisioning_using_hdparm
>
> It worked great!
>
> Good Luck,
> Daniel
>
> --
> Daniel Bayerdorffer, VP danielb at numberall.com
> Numberall Stamp & Tool Co., Inc. www.numberall.com
> Reuleaux Models  www.reuleauxmodels.com
> CypherSafe  www.cyphersafe.io
> PO BOX 187, Sangerville, ME 04479 USA
> TEL: 207-876-3541 FAX: 207-876-3566
>
> ------------------------------
> *From: *"zfs-discuss" <zfs-discuss at list.zfsonlinux.org>
> *To: *"zfs-discuss" <zfs-discuss at list.zfsonlinux.org>
> *Sent: *Monday, April 16, 2018 8:11:45 AM
> *Subject: *Re: [zfs-discuss] ZiL performance
>
> Google for "ata secure erase".
>
> On Mon, Apr 16, 2018 at 1:08 PM, Ali Hamid via zfs-discuss <
> zfs-discuss at list.zfsonlinux.org> wrote:
>
>> Hi,
>> friends, i search in about how use slog in long term without decrease
>> performance, I find :
>> "
>> To ensure maximum ZIL performance on NAND flash SSD-based SLOG devices,
>> you should also overprovison spare area to increase IOPS[3]. You can do
>> this with a mix of a secure erase and a partition table trick, such as the
>> following:
>>
>>     Run a secure erase on the NAND-flash SSD.
>>     Create a partition table on the NAND-flash SSD.
>>     Create a 4GB partition.
>>     Give the partition to ZFS to use as a log device.
>>
>> If using the secure erase and partition table trick, do not use the
>> unpartitioned space for other things, even temporarily. That will reduce or
>> eliminate the overprovisioning by marking pages as dirty.
>> "
>>
>> can you help me for "Run a secure erase on the NAND-flash SSD."?
>>
>> very thanks
>>
>> _______________________________________________
>> zfs-discuss mailing list
>> zfs-discuss at list.zfsonlinux.org
>> http://list.zfsonlinux.org/cgi-bin/mailman/listinfo/zfs-discuss
>>
>>
>
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