Date: Thu, 20 Feb 2014 14:14:50 +0100 From: Miroslav Lachman <000.fbsd@quip.cz> To: Willem Jan Withagen <wjw@digiware.nl> Cc: fs@freebsd.org Subject: Re: What types of SSDs to use..... Message-ID: <5305FFCA.6070702@quip.cz> In-Reply-To: <5305F8B0.1060308@digiware.nl> References: <5305F8B0.1060308@digiware.nl>
next in thread | previous in thread | raw e-mail | index | archive | help
Willem Jan Withagen wrote:
> Hi,
>
> I'm looking for advise and suggestions on what SSDs to use for the
> ZFS-systems I have and/or am building....
>
> I know the difference between SLC en MLC , but beyond that I have not
> the best experience with all the older SSD I have lingering about here.
>
> Most of them just "disconnect" after a while.
> It could be because they have exceeded their wear level and just can not
> write any more. But than that has occurred rather fast.
If we are talking about cheap SSDs... we are using Samsung 840 Pro
(MLC). We have them on MariaDB (MySQL) server for a few month.
It is good to watch SMART of SSDs, mainly for Wear_Leveling_Count. You
can see this (for example):
ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE
UPDATED WHEN_FAILED RAW_VALUE
5 Reallocated_Sector_Ct 0x0033 100 100 010 Pre-fail
Always - 0
9 Power_On_Hours 0x0032 099 099 000 Old_age
Always - 2176
12 Power_Cycle_Count 0x0032 099 099 000 Old_age
Always - 5
177 Wear_Leveling_Count 0x0013 097 097 000 Pre-fail Always
- 108
179 Used_Rsvd_Blk_Cnt_Tot 0x0013 100 100 010 Pre-fail Always
- 0
181 Program_Fail_Cnt_Total 0x0032 100 100 010 Old_age Always
- 0
182 Erase_Fail_Count_Total 0x0032 100 100 010 Old_age Always
- 0
183 Runtime_Bad_Block 0x0013 100 100 010 Pre-fail Always
- 0
187 Uncorrectable_Error_Cnt 0x0032 100 100 000 Old_age Always
- 0
190 Airflow_Temperature_Cel 0x0032 081 069 000 Old_age Always
- 19
195 ECC_Error_Rate 0x001a 200 200 000 Old_age Always
- 0
199 CRC_Error_Count 0x003e 100 100 000 Old_age Always
- 0
235 POR_Recovery_Count 0x0012 099 099 000 Old_age Always
- 2
241 Total_LBAs_Written 0x0032 099 099 000 Old_age Always
- 10494506165
Miroslav Lachman
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?5305FFCA.6070702>