Re: [PATCH 6/6] Btrfs-progs: detect if the disk we are formatting is a ssd
On 20/01/13 08:14, Brendan Hide wrote: Can't help but suggest that a NO_DEDUP command could be added to the SATA Transport Protocol/SCSI Command set. Not sure where to submit that idea ... :-/ Serial ATA International Organization (SATA-IO) maintain the specs for SATA. Looks like membership is limited to companies and costs US$1,700 a year. http://sata-io.org/ SCSI is from the T10 committee: http://www.t10.org/ The intro page indicates it's a fairly open group: # T10 operates under INCITS and is responsible for SCSI Storage # Interfaces. Its principal work is the Small Computer System # Interface (SCSI), including the family of SCSI-3 projects. # Anyone directly and materially affected is welcome to # participate on T10 (essentially, this amounts to anyone # interested in T10's work). cheers, Chris -- Chris Samuel : http://www.csamuel.org/ : Melbourne, VIC -- To unsubscribe from this list: send the line unsubscribe linux-btrfs in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: [PATCH 6/6] Btrfs-progs: detect if the disk we are formatting is a ssd
On Sat, Jan 19, 2013 at 11:14:09PM +0200, Brendan Hide wrote: On 2013/01/19 08:06 PM, Gene Czarcinski wrote: Signed-off-by: Josef Bacik jba...@fusionio.com Signed-off-by: Gene Czarcinski g...@czarc.net --- -values are raid0, raid1, raid10 or single. +values are raid0, raid1, raid10, single or dup. Single device will have dup +set by default except in the case of SSDs which will default to single. This is +because SSDs can remap blocks internally so duplicate blocks could end up in the +same erase block which negates the benefits of doing metadata duplication. Can't help but suggest that a NO_DEDUP command could be added to the SATA Transport Protocol/SCSI Command set. Not sure where to submit that idea ... :-/ You might get your answer from lkml, fsdevel or linux-scsi. david -- To unsubscribe from this list: send the line unsubscribe linux-btrfs in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: [PATCH 6/6] Btrfs-progs: detect if the disk we are formatting is a ssd
On 2013/01/19 08:06 PM, Gene Czarcinski wrote: Signed-off-by: Josef Bacik jba...@fusionio.com Signed-off-by: Gene Czarcinski g...@czarc.net --- -values are raid0, raid1, raid10 or single. +values are raid0, raid1, raid10, single or dup. Single device will have dup +set by default except in the case of SSDs which will default to single. This is +because SSDs can remap blocks internally so duplicate blocks could end up in the +same erase block which negates the benefits of doing metadata duplication. Can't help but suggest that a NO_DEDUP command could be added to the SATA Transport Protocol/SCSI Command set. Not sure where to submit that idea ... :-/ -- Brendan Hide http://swiftspirit.co.za/ -- To unsubscribe from this list: send the line unsubscribe linux-btrfs in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
