[OpenIndiana-discuss] 4k sectors again
Hi all Seems most drives are moving to 512-bytes-on-4k-sectors these days, as with the new 7K4000 drives from Hitachi. I saw a patch for zpool some time back, fixing ashift, but that's all. Is there an official fix somewhere? What do people with 4k drives do? -- Vennlige hilsener / Best regards roy -- Roy Sigurd Karlsbakk (+47) 97542685 r...@karlsbakk.net http://blogg.karlsbakk.net/ -- I all pedagogikk er det essensielt at pensum presenteres intelligibelt. Det er et elementært imperativ for alle pedagoger å unngå eksessiv anvendelse av idiomer med fremmed opprinnelse. I de fleste tilfeller eksisterer adekvate og relevante synonymer på norsk. ___ OpenIndiana-discuss mailing list OpenIndiana-discuss@openindiana.org http://openindiana.org/mailman/listinfo/openindiana-discuss
Re: [OpenIndiana-discuss] 4k sectors again
On Tue, Feb 14, 2012 at 10:53 PM, Roy Sigurd Karlsbakk wrote: > Hi all > > Seems most drives are moving to 512-bytes-on-4k-sectors these days, as > with the new 7K4000 drives from Hitachi. I saw a patch for zpool some time > back, fixing ashift, but that's all. Is there an official fix somewhere? > What do people with 4k drives do? > If the drive reports its block size as 4K ZFS will do the right thing already. Only drives that lie about the actual block size and report 512 bytes are problematic. For such drives the technique I found useful is to create a pool on some other devices that are true 4K and then replace the devices one by one with the problematic drives. COMSTAR comes really handy for such a trick. Also Linux ZFS let you specify ashift manually during pool creation. -- Regards, Cyril ___ OpenIndiana-discuss mailing list OpenIndiana-discuss@openindiana.org http://openindiana.org/mailman/listinfo/openindiana-discuss
Re: [OpenIndiana-discuss] 4k sectors again
> > Seems most drives are moving to 512-bytes-on-4k-sectors these days, > > as > > with the new 7K4000 drives from Hitachi. I saw a patch for zpool > > some time > > back, fixing ashift, but that's all. Is there an official fix > > somewhere? > > What do people with 4k drives do? > > > > If the drive reports its block size as 4K ZFS will do the right thing > already. Only drives that lie about the actual block size and report > 512 > bytes are problematic. > For such drives the technique I found useful is to create a pool on > some > other devices that are true 4K and then replace the devices one by one > with > the problematic drives. > COMSTAR comes really handy for such a trick. Also Linux ZFS let you > specify > ashift manually during pool creation. Basically, *all* drives lie about this these days, so we'd better fix it in software instead of hoping drives and politicians stop lying. So I guess what must be done, then, is to port the fix from Linux ZFS to Illumos/OpenIndiana? Installing this system with linux zfs and then move to openindiana isn't very amusing... Any idea how much code this is? Or is it the old patch that was rejected a year ago or so? Vennlige hilsener / Best regards roy -- Roy Sigurd Karlsbakk (+47) 97542685 r...@karlsbakk.net http://blogg.karlsbakk.net/ -- I all pedagogikk er det essensielt at pensum presenteres intelligibelt. Det er et elementært imperativ for alle pedagoger å unngå eksessiv anvendelse av idiomer med fremmed opprinnelse. I de fleste tilfeller eksisterer adekvate og relevante synonymer på norsk. ___ OpenIndiana-discuss mailing list OpenIndiana-discuss@openindiana.org http://openindiana.org/mailman/listinfo/openindiana-discuss
Re: [OpenIndiana-discuss] 4k sectors again
Umm, no, not all drives do this, it is relatively easy to get hold of drives that aren't EARS ... you are just better off going for non-consumer drives. Will post links if you need them. Jon On 15 February 2012 08:24, Roy Sigurd Karlsbakk wrote: >> > Seems most drives are moving to 512-bytes-on-4k-sectors these days, >> > as >> > with the new 7K4000 drives from Hitachi. I saw a patch for zpool >> > some time >> > back, fixing ashift, but that's all. Is there an official fix >> > somewhere? >> > What do people with 4k drives do? >> > >> >> If the drive reports its block size as 4K ZFS will do the right thing >> already. Only drives that lie about the actual block size and report >> 512 >> bytes are problematic. >> For such drives the technique I found useful is to create a pool on >> some >> other devices that are true 4K and then replace the devices one by one >> with >> the problematic drives. >> COMSTAR comes really handy for such a trick. Also Linux ZFS let you >> specify >> ashift manually during pool creation. > > Basically, *all* drives lie about this these days, so we'd better fix it in > software instead of hoping drives and politicians stop lying. > > So I guess what must be done, then, is to port the fix from Linux ZFS to > Illumos/OpenIndiana? Installing this system with linux zfs and then move to > openindiana isn't very amusing... > > Any idea how much code this is? Or is it the old patch that was rejected a > year ago or so? > > Vennlige hilsener / Best regards > > roy > -- > Roy Sigurd Karlsbakk > (+47) 97542685 > r...@karlsbakk.net > http://blogg.karlsbakk.net/ > -- > I all pedagogikk er det essensielt at pensum presenteres intelligibelt. Det > er et elementært imperativ for alle pedagoger å unngå eksessiv anvendelse av > idiomer med fremmed opprinnelse. I de fleste tilfeller eksisterer adekvate og > relevante synonymer på norsk. > > ___ > OpenIndiana-discuss mailing list > OpenIndiana-discuss@openindiana.org > http://openindiana.org/mailman/listinfo/openindiana-discuss ___ OpenIndiana-discuss mailing list OpenIndiana-discuss@openindiana.org http://openindiana.org/mailman/listinfo/openindiana-discuss
Re: [OpenIndiana-discuss] 4k sectors again
Any idea where to find a 4TB drive with 512 byte sectors? Hitachis drives are 512b on 3TB, but AFAICS they have jumped to 4k sectors since the 4TB drives came out roy - Opprinnelig melding - > Umm, no, not all drives do this, it is relatively easy to get hold of > drives that aren't EARS ... you are just better off going for > non-consumer drives. > > Will post links if you need them. > > Jon > > On 15 February 2012 08:24, Roy Sigurd Karlsbakk > wrote: > >> > Seems most drives are moving to 512-bytes-on-4k-sectors these > >> > days, > >> > as > >> > with the new 7K4000 drives from Hitachi. I saw a patch for zpool > >> > some time > >> > back, fixing ashift, but that's all. Is there an official fix > >> > somewhere? > >> > What do people with 4k drives do? > >> > > >> > >> If the drive reports its block size as 4K ZFS will do the right > >> thing > >> already. Only drives that lie about the actual block size and > >> report > >> 512 > >> bytes are problematic. > >> For such drives the technique I found useful is to create a pool on > >> some > >> other devices that are true 4K and then replace the devices one by > >> one > >> with > >> the problematic drives. > >> COMSTAR comes really handy for such a trick. Also Linux ZFS let you > >> specify > >> ashift manually during pool creation. > > > > Basically, *all* drives lie about this these days, so we'd better > > fix it in software instead of hoping drives and politicians stop > > lying. > > > > So I guess what must be done, then, is to port the fix from Linux > > ZFS to Illumos/OpenIndiana? Installing this system with linux zfs > > and then move to openindiana isn't very amusing... > > > > Any idea how much code this is? Or is it the old patch that was > > rejected a year ago or so? > > > > Vennlige hilsener / Best regards > > > > roy > > -- > > Roy Sigurd Karlsbakk > > (+47) 97542685 > > r...@karlsbakk.net > > http://blogg.karlsbakk.net/ > > -- > > I all pedagogikk er det essensielt at pensum presenteres > > intelligibelt. Det er et elementært imperativ for alle pedagoger å > > unngå eksessiv anvendelse av idiomer med fremmed opprinnelse. I de > > fleste tilfeller eksisterer adekvate og relevante synonymer på > > norsk. > > > > ___ > > OpenIndiana-discuss mailing list > > OpenIndiana-discuss@openindiana.org > > http://openindiana.org/mailman/listinfo/openindiana-discuss > > ___ > OpenIndiana-discuss mailing list > OpenIndiana-discuss@openindiana.org > http://openindiana.org/mailman/listinfo/openindiana-discuss -- Vennlige hilsener / Best regards roy -- Roy Sigurd Karlsbakk (+47) 97542685 r...@karlsbakk.net http://blogg.karlsbakk.net/ -- I all pedagogikk er det essensielt at pensum presenteres intelligibelt. Det er et elementært imperativ for alle pedagoger å unngå eksessiv anvendelse av idiomer med fremmed opprinnelse. I de fleste tilfeller eksisterer adekvate og relevante synonymer på norsk. ___ OpenIndiana-discuss mailing list OpenIndiana-discuss@openindiana.org http://openindiana.org/mailman/listinfo/openindiana-discuss
