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From: Perry and Lorae Merritt (plmerritt, hypermall dot net) Date: 2001.11.07 - 21.32 MST
X-Mailer: Microsoft Outlook Express 5.50.4522.1200 I'm going to look into this tomorrow at work. I guess I feel the need to see the code so that I can be confident about what's going on. P ----- Original Message ----- From: June Mullins To: antera, cryptofreak dot org Sent: Wednesday, November 07, 2001 3:16 PM Subject: Re: terabyte limit Kevin's note says Reiser is limited by page cache to 17592 GB on systems with 32 bit addressing (presumably because Reiser uses 4k blocks). Isn't that about 17TB, or am I misreading the digits? And the LVM and block layer fixes, which are below us, allow a logical volume to be > 2TB, which it must be to accomodate the larger file system. But I don't know what else is involved. June Perry and Lorae Merritt wrote: Since I'm pretty sure the block layer is below us and since we're dealingwith physical devices that are less than a TB, why would we apply fixes tothe block layer?I guess what we really need to know is how is LVM called from above? What isthe data structure that is passed? I guess this is another reason for me tohave a linux box here, or at least the source code. ;-)In the old days, on AIX, the block driver was passed a structure called abuf structure. That structure had the device stuff in it for the IO. Itcontained the mem address of where to put/get the data, which device it wason, and the offset on the device. Does Linux use a similar mechanism?P----- Original Message -----From: "June Mullins" <junemullins, earthlink dot net>To: <antera, cryptofreak dot org>Sent: Tuesday, November 06, 2001 2:09 PMSubject: Re: terabyte limit So, from the note, it sounds like we would just have to apply the 64 bitpatch tothe generic block layer (and to lvm, if we wind up using it) to getaround the 1 or2 Tb limit. However see the link in the referenced note to the nextnote aboutLVM extent size - that might be something to worry about if we use lvmrather than roll our own. JuneDon jessup wrote: Here is a link to some information on the limit size.http://lists.sistina.com/pipermail/linux-lvm/2001-September/008678.html__________________________________________________Do You Yahoo!?Find a job, post your resume.http://careers.yahoo.com--This ! is the antera mailing list. To unsubscribe, emailmajordomo, cryptofreak dot org with message body `unsubscribe antera'.Or, for more information, visit http://www.cryptofreak.org/. --This is the antera mailing list. To unsubscribe, emailmajordomo, cryptofreak dot org with message body `unsubscribe antera'.Or, for more information, visit http://www.cryptofreak.org/. --This is the antera mailing list. To unsubscribe, emailmajordomo, cryptofreak dot org with message body `unsubscribe antera'.Or, for more information, visit http://www.cryptofreak.org/. -- This is the antera mailing list. To unsubscribe, email majordomo, cryptofreak dot org with message body `unsubscribe antera'. Or, for more information, visit http://www.cryptofreak.org/.
This archive was generated by hypermail 2b30 : 2001.11.08 - 04.02 MST |
