Kaydol

Flood göndermek, insanların floodlarını okumak ve diğer insanlarla bağlantı kurmak için sosyal Floodlar ve Flood Yanıtları Motorumuza kaydolun.

Oturum aç

Flood göndermek, insanların floodlarını okumak ve diğer insanlarla bağlantı kurmak için sosyal Floodlar ve Flood Yanıtları Motorumuza giriş yapın.

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3 ve kadim dostu 1 olan sj'yi rakamla giriniz. ( 31 )

Üzgünüz, Flood yazma yetkiniz yok, Flood girmek için giriş yapmalısınız.

Lütfen bu Floodun neden bildirilmesi gerektiğini düşündüğünüzü kısaca açıklayın.

Lütfen bu cevabın neden bildirilmesi gerektiğini kısaca açıklayın.

Please briefly explain why you feel this user should be reported.

Questions about the 14TB Easystore sold by Best Buy

There hasn’t been a compendium written since the 8TB Easystores over four years ago.

….

**Questions**

* What drive model numbers have been found ?

* Do any of the drives have TLER / ERC support enabled by default in firmware and have these settings survive a reboot ?

* Do some drives have TLER support, but require sending a command to the drive with smartctl every time the drive is power cycled (reboot) ?

* Do some drive models require taping pins to work properly with a SATA connector ?

* Is there anything else that someone purchasing this drive should know before spending money?

….

**ERC / TLER**

Filesystems like ZFS and BTRFS that control both the block layer and filesystem layer do not require ERC/TLER for software based RAID-Z.

NAS products from Synology and other vendors that use ZFS are mostly safe without ERC/TLER

For all other implementations of software and hardware based RAID you will find that ERC/TLER is extremely important as different software controls the block layer and filesystem layers which operate independently of each other. Each layer does not know what the other is doing.

Hard disk manufacturers often include ERC/TLER set enabled to 7 seconds by default in their NAS and Enterprise products, but remove this feature from the lowest consumer products.

Various implementations exist of Error Recovery Control (ERC) by different storage manufacturers. Western Digital calls this Time Limited Error Recovery (TLER). This setting if enabled stops drive error recovery typically after 7 seconds enabling a RAID controller to take over. ERC is important to enable hardware RAID controllers to perform recovery and to prevent drives from timing out.

….

From smartctl manpage

> scterc[,READTIME,WRITETIME] – [ATA only] prints values and descriptions of the SCT Error Recovery Control settings. These are equivalent to TLER (as used by Western Digital), CCTL (as used by Samsung and Hitachi/HGST) and ERC (as used by Seagate). READTIME and WRITETIME arguments (deciseconds) set the specified values. Values of 0 disable the feature, other values less than 65 are probably not supported. For RAID configurations, this is typically set to 70,70 deciseconds.

….

To check if ERC / TLER is enabled

sudo smartctl -l scterc <device>

*@*:~$ sudo smartctl -l scterc /dev/sda
smartctl 7.1 2019-12-30 r5022 [x86_64-linux-5.4.0-90-lowlatency] (local build)
Copyright (C) 2002-19, Bruce Allen, Christian Franke, http://www.smartmontools.org

SCT Error Recovery Control:
Read: Disabled
Write: Disabled

….

To manually set ERC / TLER to 7 seconds (read, write) if supported. This does not survive reboot

sudo smartctl -l scterc,70,70 <device>

Benzer Yazılar

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3 Yorumları

  1. – all of the drives I have (and I bought 9 over time total) were WD140EDGZ, specifically WD140EDGZ-11B2DA2

    – STS error recovery shows as ‘disabled’ on all of my drives

    – dont’t know

    – yes, i had a number of them that had severe issues being powered through normal SATA power connector. Some worked through MOLEX -> SATA power adapter , some did not work at all after successfully testing them in external enclosure, attempting to connect to SATA power, and getting nothing at all

    – YMMV. I bought 9 of them, had no issues with 5 of them, had to first exchange 4 and then had to return 3 of them total due to weird experiences of drives not powering up. I opened few threads on this here in DataHoarder.

    Ultimately, I am happy with 6 I have tested and deployed in raid-z2. would I do it again if I had to do all over – no. I would save up and buy ‘normal’ drives with warranties.

  2. I can’t say much about the features you’re asking about but I have shucked 6 of these drives so far and here are the models I pulled from them. They were all purchased at random intervals based on when I could afford them/sales.

    4x WD140EDGZ-11B1PA0
    2x WD140EDFZ-11A0VA0

    I can also confirm that removing pin-8 on one particular Windbond chip (labeled U2 on the board, chip model 205) effectively removes the SATA drive restrictions. I’ve taken all of the enclosure SATA modules and was able to use them with much smaller drives and from other manufacturers.