tag:blogger.com,1999:blog-7036379482487192438.post8250708598434932065..comments2023-03-15T11:27:40.919+01:00Comments on the birdhouse in my soul: Synology RS3413xs+ tech notesBert de Bruijnhttp://www.blogger.com/profile/14859034314670252617noreply@blogger.comBlogger7125tag:blogger.com,1999:blog-7036379482487192438.post-56941232373331269532018-02-05T11:59:42.648+01:002018-02-05T11:59:42.648+01:00By now, Synology SSD cache users are probably all ...By now, Synology SSD cache users are probably all using read/write caching. The flashcache mode being used by Synology is now "write_back" :<br /><br /># dmsetup table cachedev_0 | head -2<br />0 23403556352 flashcache-syno conf:<br /> ssd dev (/dev/md3), disk dev (/dev/md2) cache mode(WRITE_BACK)<br />Bert de Bruijnhttps://www.blogger.com/profile/14859034314670252617noreply@blogger.comtag:blogger.com,1999:blog-7036379482487192438.post-90691570094889454302013-08-28T09:57:00.279+02:002013-08-28T09:57:00.279+02:00Adam, you'll be happy to hear that DSM4.3 supp...Adam, you'll be happy to hear that DSM4.3 supports what you want to do: use any drive bay for SSD cache.<br /><br />One downside in the DSM 4.3 upgrade for me: my ethernet interfaces got renumbered, so my Synology showed other IP addresses on other VLANs, making it unreachable. Had to change switchport VLAN assignment to fix that.Bert de Bruijnhttps://www.blogger.com/profile/14859034314670252617noreply@blogger.comtag:blogger.com,1999:blog-7036379482487192438.post-88243187740661865212013-07-25T10:05:42.275+02:002013-07-25T10:05:42.275+02:00Hi Adam,
All IO going to that logical volume would...Hi Adam,<br />All IO going to that logical volume would benefit from the flashcache. The IO is going to the flashcache-enabled device, after all. If both iSCSI and CIFS activity are directed at that same volume (meaning the iSCSI LUNs are file-based, and on the same volume as the CIFS shares), both benefit.Bert de Bruijnhttps://www.blogger.com/profile/14859034314670252617noreply@blogger.comtag:blogger.com,1999:blog-7036379482487192438.post-48573744079318123412013-04-23T02:09:07.647+02:002013-04-23T02:09:07.647+02:00Hi Bert,
Thanks for sharing your experience, this...Hi Bert,<br /><br />Thanks for sharing your experience, this is probably the best write up I have seen on the topic. I am hoping to get your advice on a topic. Like yourself I purchase a Synology for my home lab however I purchased the DS3612xs. While not officially supported for SSD caching don’t see any technical constraints that would prevent me manually creating the flashcache device. I currently have one single large volume upon which I use share files via CIFS as well as file based ISCSI to run a number of VM’s. I had planned on creating a second volume of two 500GB SSD’s but it seems silly to dedicate those devices to VM’s where I have to take into account space constraints etc. when I could use those same devices as flash cache. My question is if I were to create the flashcache device would the VM’s running on the ISCSI LUN benefit from the SSD caching (I assume individual block of the ISCSI file woudl be cached?) as well as the files I am serving via CIFS?<br /><br />Ultimately the VM’s are my primary concern, I would like caching for CIFS users but that would be the icing on the cake.<br /><br />Appreciate the input,<br /><br />Adam<br />Adamhttps://www.blogger.com/profile/06599340447831682053noreply@blogger.comtag:blogger.com,1999:blog-7036379482487192438.post-56867602477263126742013-03-29T15:25:27.189+01:002013-03-29T15:25:27.189+01:00Hi Bert,
Thanks for your reply.
I've looked a...Hi Bert,<br /><br />Thanks for your reply.<br />I've looked at the synology commands but they are limited in functionalities.<br />I've managed to configure the cache using the "standard" flashcache commands, after creating different md devices manually.<br />I'm going to script it but I still have to find a good time to run my script in the boot process.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-7036379482487192438.post-47370651247567318242013-03-19T16:11:35.132+01:002013-03-19T16:11:35.132+01:00Hi Craig,
I don't use multi-volume flashcache ...Hi Craig,<br />I don't use multi-volume flashcache myself. I was just pointing out the theoretical possibility. Just like with a multi-VLAN setup (which I am doing), there's several hurdles to take. Some of them can be scripted in a shellscript using the internal synology commands, but many of those have not been fully documented, it seems. Have you looked at the commands in /usr/syno/sbin ?Bert de Bruijnhttps://www.blogger.com/profile/14859034314670252617noreply@blogger.comtag:blogger.com,1999:blog-7036379482487192438.post-80048687406480422402013-03-12T18:08:11.312+01:002013-03-12T18:08:11.312+01:00Hi Bert,
Can you provide some details on how you u...Hi Bert,<br />Can you provide some details on how you use flashcache for multiple volumes?<br />I've managed to create the cache device but I'm unable to mount the volume.<br />Thanks!Anonymousnoreply@blogger.com