I was successfully running my DS414 with a combination of 4TB+4TB+4TB+1.8TB disks in two volumes.\u00a0 I wanted to increase capacity so I bought a 6TB seagate external disk because the price was right.\u00a0 I figured I’d pull the disk out of the chassis and slide it into my NAS.\u00a0 Mistake number one.<\/p>\n
The disk inside the chassis was a Seagate ST6000DM003.<\/p>\n
After waiting 3 weeks for the volume to resize I started using the Volume.\u00a0 My plan was to move some ProxMox containers and VM’s onto the Volume as part of a PVE update.\u00a0 But any reads\/writes to\/from the volume would cause the entire volume to lock up for 30 seconds at a time.\u00a0 This was causing Plex streaming to block as well. Something was wrong.<\/p>\n
I used the Synology tools to try to figure it out but there was no help there.\u00a0 So I did what I do best and dove into the shell.\u00a0 I ssh’d and started digging around.\u00a0 \u00a0After some digging, here is what I discovered.<\/p>\n
Here’s the configuration:<\/p>\n
\/dev\/sda – Seagate ST4000DX001<\/p>\n
\/dev\/sdb – Seagate ST4000DX001<\/p>\n
\/dev\/sdc – Seagate ST6000DM003<\/p>\n
\/dev\/sdd – Western Digital\u00a0WD40EZRX<\/p><\/blockquote>\n
\/proc\/diskstats showed that the weighted average IO completion time for the ST6000DM003 was 160x slower than the other disks:<\/p>\n
sh-4.3# cat diskstats | grep ” sd[abcd] ” | awk ‘{print $3,$14}’
\nsda 5628640
\nsdb 5558600
\nsdc 946825590
\nsdd 5950130<\/p><\/blockquote>\nI have a bad disk.<\/p>\n
The more bad news is that Seagate’s website doesn’t appear to be able to pull up the warranty status because the disk serial number is not found on Seagate’s side.\u00a0 I probably have to get the serial number of the chassis.\u00a0 This probably implies that Seagate is not going to honor the disk warranty because I pulled it out of the chassis.\u00a0 \u00a0I’ve sent a support request so we’ll see what I get back on that.<\/p>\n
<\/p>\n","protected":false},"excerpt":{"rendered":"
I was successfully running my DS414 with a combination of 4TB+4TB+4TB+1.8TB disks in two volumes.\u00a0 I wanted to increase capacity so I bought a 6TB seagate external disk because the price was right.\u00a0 I figured I’d pull the disk out of the chassis and slide it into my NAS.\u00a0 Mistake number one. The disk inside… Continue reading »<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-195","post","type-post","status-publish","format-standard","hentry","category-tech-stuff"],"_links":{"self":[{"href":"https:\/\/www.beer.org\/blog\/index.php\/wp-json\/wp\/v2\/posts\/195","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.beer.org\/blog\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.beer.org\/blog\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.beer.org\/blog\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.beer.org\/blog\/index.php\/wp-json\/wp\/v2\/comments?post=195"}],"version-history":[{"count":1,"href":"https:\/\/www.beer.org\/blog\/index.php\/wp-json\/wp\/v2\/posts\/195\/revisions"}],"predecessor-version":[{"id":196,"href":"https:\/\/www.beer.org\/blog\/index.php\/wp-json\/wp\/v2\/posts\/195\/revisions\/196"}],"wp:attachment":[{"href":"https:\/\/www.beer.org\/blog\/index.php\/wp-json\/wp\/v2\/media?parent=195"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.beer.org\/blog\/index.php\/wp-json\/wp\/v2\/categories?post=195"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.beer.org\/blog\/index.php\/wp-json\/wp\/v2\/tags?post=195"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}