Scrub/Defrag/Snapshots with Seagate Archive 8TB - ST8000AS0002

Question

Hi,&nbsp;I am thinking at putting a pare of these disks as XRAID (data redundancy) in my legacy Ultra 2 unit with latest 6.4.1 firmware.I understand the limitations. However, I does own one in my desktop used as archive and it works perfectly for my needs. NAS usage will be very similar to my desktop actual use.&nbsp;I am only wondering about speed implications of the scrub/defrag/snapshot... disk maintenance testsMainly scrub is my fear as it already takes 3 days on my 4 TB Seagate NAS disks

StephenB · Answer

I don't recommend them for NAS use (and Seagate specifically warns against it). &nbsp;
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If you search this forum, you'll find that these drives are controversial. &nbsp;However, even the proponents have had some problems with them in the ReadyNAS. &nbsp;
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At least some of these problems seem to have been fixed in 6.4.1 - perhaps some of the users of these drives will comment on their current experience (and give some real data on volume maintenance times). &nbsp;
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If you don't get a response, try PMing&nbsp;powellandy1
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chopin70 · Answer

Thanks, I will wait a little as you suggested

I also read about the issues, fixed in 6.4.1 from the feedback

This disk is in fact very tempting for the price /Gb

For archive/backup purpose, in my desktop, it is just an amazing disk with great performances.

I have one Archibe 8Tb disk in my desktop PC since 6 months now. I use it as a backup that is mirrored to the NAS each 6h on a schedule. Performance wise, the NAS with standard HDDs in it has much lower performances than my desktop with the archive HDD. Be it read or sustained write, the Ultra 2 NAS with 7500 rpm disks is far behind. I took time to test it. If we stay to its dedicated use, it just beats any current disk price per performance wise.

So I don't think I will be disappointed with its performances in a RAID 1 setup used the way I do: backups + streaming

The main concern is really about the maintenance tasks, mainly routine snapshots and the deadly scrub.

chopin70 · Answer

I found this topic on FreeNAShttps://forums.freenas.org/index.php?threads/seagate-8tb-archive-drive-in-freenas.27740/page-3&nbsp;Scrub speed seems all but an issueSo I am really tempted

mdgm-ntgr · Answer

Well how do the specs of your PC compare with that of the Ultra 2? Also, what model disks are you using in the Ultra 2?Certainly when looking at current generation disks, the Archive disks are pretty slow.
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Well I would probably schedule 3-4 scrubs a year max.
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chopin70 · Answer

Desktop is an i5 clocked at 3.4 GHz with 32 Gb of RAM, so yes, it is faster than my Ultra 2 NAS.&nbsp;The disks in the NAS are&nbsp;Seagate NAS HDD 4TB - ST4000VN000 (2x): 64Mb cache and 5900 rpm&nbsp;The write speed of 2 to 16Gb files is very poor from desktop to the NAS (75 MB /sec), compared from desktop disk 1 to desktop Archive HDD (150 MB /s). NAS is using a full 1Gb LAN connection&nbsp;Scrubs are scheduled every 3 months

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Scrub/Defrag/Snapshots with Seagate Archive 8TB - ST8000AS0002

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