{"id":1151,"date":"2014-09-01T08:55:52","date_gmt":"2014-09-01T07:55:52","guid":{"rendered":"http:\/\/www.tekhead.org\/blog\/?p=1151"},"modified":"2014-09-01T08:55:52","modified_gmt":"2014-09-01T07:55:52","slug":"cannot-see-any-iscsi-devices-on-synology-from-a-vsphere-host","status":"publish","type":"post","link":"https:\/\/tekhead.it\/blog\/2014\/09\/cannot-see-any-iscsi-devices-on-synology-from-a-vsphere-host\/","title":{"rendered":"Cannot See Any iSCSI Devices on Synology from a vSphere Host"},"content":{"rendered":"

Just a quick fix I discovered this weekend. It’s probably quite specific but hopefully if you come across this in future it will save you some time.<\/p>\n

I had just finished rebuilding the second node in my lab from 5.1 with a fresh install. I added the software iSCSI initiator and connected it to my iSCSI target (Synology DS412+) using Dynamic Discovery. I then rescanned for a list of devices, and although I was picking up the IQN for the iSCSI server, I couldn’t see any devices!<\/p>\n

I tried lots of things including removing and re-adding the initiator, messing with iSCSI bindings, but nothing! Very frustrating.<\/p>\n

After a bit of googlage, I came across this KB article from VMware:<\/p>\n

Cannot see some or all storage devices in VMware vCenter Server or VirtualCenter (1016222)<\/a><\/p>\n

Although this was specific to VI3\/vSphere 4, it did trigger a thought! Just before I built the new node, I rejigged all of my storage LUNs, deleting 3 old ones in the process (which just so happened to be the first 3 LUNs on my NAS). What I believe this caused is\u00a0that the LUNs were viewed by node 1 as different LUN IDs on node 2, so they refused to show up!<\/p>\n

So now, the fix. Incredibly simple as it turns out:<\/p>\n

    \n
  1. Created three\u00a0new temp\u00a010GB LUNs on my old NAS which would then assume LUN IDs 1\/2\/3 as they originally had (before I deleted them).<\/li>\n
  2. Rescan the new node of the cluster for storage<\/li>\n
  3. Confirmed all of the LUNs are now visible<\/li>\n
  4. Deleted the three\u00a0temp LUNs from the Synology (I don’t plan to add any more nodes for now so I have no need of these temp LUNs, but as they’re thin provisioned anyway it actually wouldn’t hurt to leave them there).<\/li>\n
  5. Rescan the ESXi host again to ensure it can still see the LUNs.<\/li>\n
  6. Job done!<\/li>\n<\/ol>\n

    \"Synology<\/a><\/p>\n

    Not much to it, but worth a quick post I thought as this simple issue wasted a chunk of my time!<\/p>\n","protected":false},"excerpt":{"rendered":"

    Just a quick fix I discovered this weekend. It’s probably quite specific but hopefully if you come across this in future it will save you some time. I [..]<\/p>\n","protected":false},"author":1,"featured_media":889,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_focuskw":"","_yoast_wpseo_title":"","_yoast_wpseo_metadesc":"","jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[41],"tags":[324,331,86,328,330,116,325,326,327,189,187,329,88],"class_list":["post-1151","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-vmware","tag-5-5","tag-devices","tag-esxi","tag-fault","tag-iqn","tag-iscsi","tag-lun","tag-missing","tag-nas","tag-storage","tag-synology","tag-vmhba38","tag-vsphere"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/tekhead.it\/wp-uploads\/www.tekhead.org\/2013\/04\/Storage150.jpg","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p2l3lU-iz","amp_enabled":true,"_links":{"self":[{"href":"https:\/\/tekhead.it\/blog\/wp-json\/wp\/v2\/posts\/1151","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/tekhead.it\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/tekhead.it\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/tekhead.it\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/tekhead.it\/blog\/wp-json\/wp\/v2\/comments?post=1151"}],"version-history":[{"count":0,"href":"https:\/\/tekhead.it\/blog\/wp-json\/wp\/v2\/posts\/1151\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/tekhead.it\/blog\/wp-json\/wp\/v2\/media\/889"}],"wp:attachment":[{"href":"https:\/\/tekhead.it\/blog\/wp-json\/wp\/v2\/media?parent=1151"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/tekhead.it\/blog\/wp-json\/wp\/v2\/categories?post=1151"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/tekhead.it\/blog\/wp-json\/wp\/v2\/tags?post=1151"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}