[zfs-discuss] ZiL performance

Daniel Bayerdorffer danielb at numberall.com
Mon Apr 16 10:55:18 EDT 2018


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 < [ mailto:zfs-discuss at list.zfsonlinux.org | 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 

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