4 messages, 2 authors, 2008-02-04 · open the first message on its own page
From: Keld Jørn Simonsen <hidden>
Date: 2008-02-02 23:53:35
I found a sentence in the HOWTO: "raid1 and raid 10 always writes all data to all disks" I think this is wrong for raid10. eg a raid10,f2 of 4 disks only writes to two of the disks - not all 4 disks. Is that true? best regards keld
From: Bill Davidsen <hidden>
Date: 2008-02-03 15:56:01
Keld Jørn Simonsen wrote:
I found a sentence in the HOWTO: "raid1 and raid 10 always writes all data to all disks" I think this is wrong for raid10. eg a raid10,f2 of 4 disks only writes to two of the disks - not all 4 disks. Is that true?
I suspect that really should have read "all mirror copies," in the raid10 case. -- Bill Davidsen [off-list ref] "Woe unto the statesman who makes war without a reason that will still be valid when the war is over..." Otto von Bismark - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
From: Keld Jørn Simonsen <hidden>
Date: 2008-02-03 17:13:17
On Sun, Feb 03, 2008 at 10:56:01AM -0500, Bill Davidsen wrote:
Keld Jørn Simonsen wrote:quoted
I found a sentence in the HOWTO: "raid1 and raid 10 always writes all data to all disks" I think this is wrong for raid10. eg a raid10,f2 of 4 disks only writes to two of the disks - not all 4 disks. Is that true?I suspect that really should have read "all mirror copies," in the raid10 case.
OK, I changed the text to: raid1 always writes all data to all disks. raid10 always writes all data to the number of copies that the raid holds. For example on a raid10,f2 or raid10,o2 of 6 disks, the data will only be written 2 times. Best regards Keld - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
From: Bill Davidsen <hidden>
Date: 2008-02-04 18:24:10
Keld Jørn Simonsen wrote:
On Sun, Feb 03, 2008 at 10:56:01AM -0500, Bill Davidsen wrote:quoted
Keld Jørn Simonsen wrote:quoted
I found a sentence in the HOWTO: "raid1 and raid 10 always writes all data to all disks" I think this is wrong for raid10. eg a raid10,f2 of 4 disks only writes to two of the disks - not all 4 disks. Is that true?I suspect that really should have read "all mirror copies," in the raid10 case.OK, I changed the text to: raid1 always writes all data to all disks.
Just to be really pedantic, you might say "devices" instead of disks, since many or most arrays are on partitions. Otherwise I like this, it's much clearer.
raid10 always writes all data to the number of copies that the raid holds. For example on a raid10,f2 or raid10,o2 of 6 disks, the data will only be written 2 times. Best regards Keld
-- Bill Davidsen [off-list ref] "Woe unto the statesman who makes war without a reason that will still be valid when the war is over..." Otto von Bismark - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html