Nahum, I wonder if it would be possible, after detaching SSD from the mirror in your step #2, to pass the device over to Linux running locally in KVM and 'secure erase' it from KVM other than physically disconnecting it from the smartos machine?
Which Intel SSD are you using that you haven't had issues with? DC S3500 or S3700? Thanks, Alexei > On 01/12/2015 06:56 PM, [email protected] wrote: >> I have the root volume with several I/O intensive zones on an SSD drive. >> Updating a file in one of the zones is noticeably going slow in >> comparison >> how it was several months ago, while the file size hasn't changed much. >> I >> suspect the SSD may need trimming. >> Is the TRIM not available yet in smartos? >> If so, what would be the right procedure of migrating the root volume >> with >> its zones/* onto the different drive? > > This advice may not help you since it sounds like you have your zones > pool on a single SSD rather than a mirrored pair, but perhaps it will > help someone with a similar problem. > > We have some SmartOS machines with Intel SSDs, and some with Samsung > SSDs (I think it's the 840Pro ones, but I'm not certain). We haven't had > issues with the machines with the Intel SSDs, but we started seeing slow > I/O on some of the machines with the Samsungs. > > As you guessed, illumos lacks trim support. Since I have a mirrored pool > I was able to do the following: > > 1. Offline one of the disks. > 2. Pull it out, put it in a Linux machine and do this: > https://ata.wiki.kernel.org/index.php/ATA_Secure_Erase > 3. Put it back in the SmartOS machine and put it back into the mirror > 4. Wait for the mirror to resilver > 5. Repeat for the other disk. > > Performance was restored, though I anticipate the problem will recur at > some point. The long term plan is to replace those SSDs with Intel ones > that don't seem to degrade over time. > > It would be nice to be able to issue that ATA command to the SSDs > directly from illumos, but at the moment I don't know how and the last > time I asked I didn't get very far. > > So ideally, I would recommend buying a replacement SSD whose performance > won't degrade, attach it to the current drive to make a mirror, then > remove your current SSD from the pool and use it in a laptop with an OS > that supports TRIM. > > Good luck! > > -Nahum > ------------------------------------------- smartos-discuss Archives: https://www.listbox.com/member/archive/184463/=now RSS Feed: https://www.listbox.com/member/archive/rss/184463/25769125-55cfbc00 Modify Your Subscription: https://www.listbox.com/member/?member_id=25769125&id_secret=25769125-7688e9fb Powered by Listbox: http://www.listbox.com
