Hello Vyacheslav, > Do you use NILFS as root file system? > Actually, 'nilfs' on this system is just a container that contains loop images, one of which is the root filesystem. As you can see this is a little out of the norm, so I think I should do more homework before involving a lot of your time.. At this point it in not clear if TRIM is working at all for 'ext4' or 'nilfs' on our system. It may be that the warning from 'nilfs' is legitimate.
I think it might be best for me to first find a way to test whether or not TRIM is working in general for a particular configuration. I've gone to a totally generic system with just a test 'nilfs' and 'ext4' partition to get some experience. One thing I've noticed is 'ext4' does not complain if you mount with 'discard' on a device that does NOT support it -- so that's no help. I've tried the following simple sequence: dd if=/dev/urandom of=tempfile bs=1M count=3 hdparm --fibmap tempfile <-- get start address of the file hdparm --read-sector [ADDRESS] /dev/sda rm tempfile && sync && sleep 120 hdparm --read-sector [ADDRESS] /dev/sda <-- should be all zero's Got this off the Internet. The last step NEVER returns zero's for either 'nilfs' or 'ext4'. If you happen to know of a better test, that would be appreciated. Thanks for your attention. Best regards, Mark Trumpold -----Original Message----- From: Vyacheslav Dubeyko [mailto:[email protected]] Sent: Tuesday, September 04, 2012 11:31 PM To: Mark Trumpold Cc: '[email protected]' Subject: Re: 'nilfs' TRIM issue? Hi Mark, On Tue, 2012-09-04 at 16:32 -0700, Mark Trumpold wrote: > Greetings, > > I am seeing the following message a few minutes after booting a system: > Do you use NILFS as root file system? > "NILFS warning: error -95 on discard request, turning discards off for the > device" > As I can see from message that operation is not supported (-95). So, it means that you try to use discard in the case of no support of it on the flash. How did you mount NILFS (I mean mount options)? Could you share mount utility output without any options? Could you share content of your fstab file? > We are using the "Satadom-150" flash part which does support TRIM, as > evidenced by 'ext4' filesystems having no issue with the mount 'discard' > option. > You want that it hasn't any error message when you use 'discard' mount option in the case no support of it on flash. Am I correct? With the best regards, Vyacheslav Dubeyko. > I am running: > Debian 6.0.5 > Linux kernel 3.3.1 > Nilfs-utils 2.1.1 > > Any thoughts would be greatly appreciated. > > Thanks in advance, > Mark Trumpold > > > Confidentiality Notice: The information contained in this electronic e-mail > and any accompanying attachment(s) is intended only for the use of the > intended recipient and is confidential and/or privileged. If you and we have > a confidentiality agreement or other non-disclosure obligations between us, > this Notice shall be deemed to mark and identify the content of this email > and any attachments as confidential and proprietary. 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